Veterinary drugs residuals in animal derived food bring about potential risks on the food safety issues. Food irradiation is a key technology for food safety. Food safety is focused on in the state”11th five years plan”. Several high-techs are welcomed to optimize the industrial structure, improve product quality and to ensure food safety. Food irradiation is the key one among them.The work chooses chloramphenicol as the object, honey and shrimp as the target food. The aim of the work is to answer several questions which are necessary to determine the irradiation is an appropriate technology to elimination the veterinary drugs residuals in animal derived food. These questions are: Can veterinary drugs degrade under irradiation? What are the radiolysis products, whether they are toxic? How does the degradation work?The degradation effect of chloramphenicol under irradiation was firstly studied by using aqueous solution. The results showed that under the absorbed doses of 9 kGy, the concentration of chloramphenicol decreased from 150 mg/L initially to 1%, the degradation rate was 99%. The higher the absorbed dose was, the better the removal effect of chloramphenicol was. The lower the initial concentration was, the more the drug was removed. The relationship between degradation effect, absorbed doses and initial concentration can be expressed by the equation: C/C0=A·e-BD, in which D meant absorbed dose, and constants A, B were rely on the initial concentration C0.Actually, since the chloramphenicol residual in food is too low to detect, the aqueous solution was also chosen to study the radiolysis products and mechanism. 8 main radiolysis products were determined by liquid chromatography tandem mass spectrometry （LC/MS/MS） analysis method, 3 of them were also the radiolysis products of solid chloramphenicol, others were reported at the first time. The toxicities of them were evaluated by retrieving information from the toxicological databases. Among these products, 2, 2-dichloroacetamide and 4-nitrobenzoic acid were of toxic effects, while the others had no toxicological records yet. However, the structures of these products without records were similar to chloamphenicol, so the toxicities were also similar. On the trace level, all the toxicities of the products can be ignored.By setting different atmosphere （nitrogen, nitric oxide） and additives （hydrogen peroxide, isopropanol, tert-butyl alcohol）, different radical （hydroxyl radical, hydrogen radicals, hydrated electronic） dominants in the irradiation process and different degradation effects and products formation effect would be studied. By LC/MS/MS qualitative-analysis and radiation chemical yield（G） quantitative-analysis, the result showed that OH·played the major role for degradation of chlorampheniocl in the radiation system of aqueous solution, followed by H·, e_aq^- can hardly initiate the degradation. The radicals also played the similar roles in the formation of radiolysis products. Ultimately, the degradation mechanism was proposed: In the chloramphenicol aqueous solution, the radiolysis of water yields reactive species such as OH·and H·which will cause H-abstraction reaction firstly, and then fragmentation and/or rearrangement of radicals caused degradation of chloramphenicol and information of main radiolysis products. In addition, OH·had another important role by causing OH-addition reaction.The degradation effect of low chloramphenicol residuals in food and quality of food after irradiation were studied. The gas chromatography-electron capture detector was explored for quantitative analysis of trace chloramphenicol. The indicators and their analysis methods of food quality study were under the national standard GB/T 18796-2005 and GB 2733-2005. The results showed that: When the initial concentration was 100μg/kg in honey and shrimp, the degradation rates reached more than 99% by irradiation of 9.3 kGy. The radiolysis products were too low to detect, so there would be no hazard. There were no significance changes of major nutrients in honey and shrimp after irradiation. Some indicators such as HMF in honey and volatile base of nitrogen in shrimp even got significantly better than before-irradiation.

Production of bulk（mass）poly（vinyl chloride）（PVC）resin has no centrifugation of the product and no drying treatment.Compared to suspension polymerization,the investment and operation cost of vinyl chloride（VC）bulk polymerization process is lower.M-PVC resins exhibit a narrow molecular weight distribution,uniform particle diameter,higher apparent density and porosity,covering a wide range of uses and having a promising expect.Production of M-PVC has several defects,such as high proportion of “B” level product（＞10%）and high content of residue monomer residue（＞5mg/kg）, which affect the further development of M-PVC product.The earlier study on M-PVC technology were carried by foreign researchers and were involved in the quantitative description of primary particle and particle formation process,which can not be used to guide solving the resin quality issue.Domestic research of production of M-PVC is far behind foreign countries,particularly in respect of particle formation process.The present thesis focuses on the pre-polymerization of VC,to investigate the influences of polymerization temperature,the usage of initiator and agitation rate on the pre-polymerization conversion,distribution of molecular weight and particles of resin. The particle formation process of PVC was also studied,to give an instruction for lowing the proportion of “B” level PVC and monomer residue.The study on kinetics of bulk polymerization of vinyl chloride shows that,the influences of polymerization temperature,the usage of initiator and agitation rate on the pre-polymerization conversion,distribution of molecular weight and particles of resin have the same rule with the suspension polymerization.The initiator activity is in turn of Luperox 610＞Luperox 223≈Luperox 10.Replacing of Luperox 223 with Luperox 10 can improve the thermal properties of PVC resin.Luperox 610 and Luperox 223（1:1） composite may cause the polymerization process to be steady and enhance the production efficiency. The study of particle formation process of bulk polymerization of vinyl chloride shows that PVC particle size（D_V）grows with conversion.After a certain conversion,D_V increases slowly and the distribution also tends to definite value.This conversion is defined as critical conversion（f）,and the corresponding particle size is called as critical particle size(D_Vf).As the agitation rate increased,f and D_Vfwere gradually decreased. D_V,f and D_Vfwas not influenced by polymerization temperature and usage of initiator.By using of optical microscope,scanning electron microscope（SEM）and mercury-pressure meter,the external morphology and the internal structure of PVC particles were revealed in three levels.Optical microscope photos show that PVC particle morphology is not regular when the conversion is low.As conversion increased,small particles gradually disappear and particle morphology is gradually become regular.SEM photos of resin particles from the external morphology show that the size of primary particles increase slightly as conversion increased.The surface of resin particles gradually become dense and the particles become roundness.Mercury-pressure measurements show that before the critical conversion rate,the porosity of PVC resin and pore volume increase with conversion rate.After the critical conversion,the porosity and pore volume decreased gradually.Based on the above results and Boisel’s particle formation mechanism,the mechanism of the bulk polymerization of VC is proposed as follows:the system is homogeneous in the early period of pre-polymerization,the polymer chains is formed as VC initiated by free radicals.The polymer chains coagulate each other and precipitate from the monomer phase to form the basic particles.As conversion increased,basic particles agglomerate to form primary particles with a diameter of 0.1～0.3μm.As polymerization conversion increased,the number of basic particles within primary particles increases constantly,but the number of primary particles always invariable.Finally,primary particles agglomerate to form PVC grains with a diameter of 150～260μm.The thesis can be a reference of optimizing the critical conversion of pre-polymerization of VC and reducing the proportion of “B” level PVC and monomer residue.

Zinc is one of the important nonferrous metals. China is the world’s leading zinc producer. Nowadays, the consumption and production of zinc are respectively increasing year by year. Zinc smelting industries are generally facing a conflict between the increasing demand for zinc and the shortage of zinc concentrate. Changeful and high miscellaneous zinc concentrate will become the main raw materials of zinc smelting. The use of Changeful Zinc Concentrate will have a direct impact on the production conditions of zinc hydrometallurgy process. Fluidized roasting is an important process during the Zinc Smelting. The operating conditions such as roasting temperature, roasting time, the ratio of wind to material and the exports’ pressure of fumes will have an important impact on the quality of zinc calcine. It is related to normal operation of the whole zinc hydrometallurgy process.Firstly, the main existing problems, new progress and the developmental orientation of zinc hydrometallurgy process are discussed in this paper. Then there is a focus on the changes of fluidized roasting process for zinc and associated elements. The thermodynamics and kinetics of fluidized roasting process are studied, and the Mechanism of zinc ferrite formation is analyzed. It points out that the formation of zinc ferrite is the main factor which affects the quality of zinc calcine. At the same time a way to reduce zinc ferrite generation is proposed.Based on collecting samples and data of roasting production on the production site and the theoretical analysis, the influence factors for the rate of soluble zinc, soluble iron, soluble sulphur and soluble silicon dioxide are studied. When the Zinc Concentrate have complex sources, the prediction BP neural network between material constituent, technological conditions and above zinc calcine are established. The BP neural network can predict the quality of zinc calcine, and can play a guide role in adjusting the roasting process operating parameters. There is no determined theory or method in choosing the number of hidden layer nodes in neural network. In this paper an optimization algorithm based on the principle of golden section is adopted to design the number of hidden layer nodes in neural network. By adopting traingdm function (momentum gradient drop the back-propagation algorithm) to train BP network, by comparing the predictive indexes with industrial data, and by drawing a conclusion that the predictive effect is good, neural network can be predicted accurately to set up prediction network.By designing the BP neural network the problem of hard establishment for mathematical model between technological conditions and the quality of zinc calcine is solved. So it is a meaningful attempt at zinc fluidized roasting process.

Cyclohexanone oxime is one of the most important intermediate in the industrial caprolactam technology in which benzene is used to be raw material. Conventionally it is synthesized in the cyclohexanone-hydroxylamine process. Using Titanium Silicate-1(TS-1) as catalyst, cyclohexanone oxime can be prepared from cyclohexanone, ammonia and hydrogen peroxide, which is called liquid phase ammoximation process. It can not only proceed in mild reaction condition, reach high selectivity, but also can avoid byproducts, finally realize”Zero Emission”. In 1990, Enichem of Italy developed and built an industrial equipment of liquid phase ammoximation catalyzed by titanium silicate-1, which opened a new period of cyclohexanone oxime industrial producing. However, TS-1 is very expensive and with small-granularited catalyst, which causes difficulties in industrial production, for example separation and recycle. So, how to separate and reclaim the titanium silicate-1 zeolite is becoming the most urgent problem to be resolved in the research and development of ammoximation of cyclohexanone.In this thesis, environment-friendly heteropoly acid(salts) catalyst are used in the ammoximation reaction of cyclohexanone. In the first part, a series of heteropoly acid(salts) are successfully synthesised, in which P is acted as the central atom and W、Mo、V are acted as coordinating group. They are characterized by FTIR, XRD, ICP and the results reveal that heteropoly acids get the Keggin-type structure. Then, the main factors which affect the yield of heteropoly acids are studied, such as reaction temperature, material ratio, pH value and quantity of solvent. The experiment results show that under condition of boiled and pH 1.6~1.8, the yield of heteropoly acids can reach up to 82.51%.In chapter two, the synthesised heteropoly acids(salts) are estimated by ammoximation of cyclohexanone system. Results show that the heteropoly acids with Keggin structure have the advantages of high catalyse ability, excellent selectivity and stability, mild reaction condition and free of pollution. Using heteropoly acids as catalyst, the ammoximation reaction process are optimized and effects of the dosage of catalyst, reaction temperature, reaction time, the dosage of H2O2 and solvent on reaction are inverstigated. The results indicate that using water as solvent, at 20℃for 5.0h, with H3PW12O40 19.6g/1mol cyclohexanone and ratio of hydroperoxide/acetone 1.6/1, the conversion of cyclohexanone and the selectivity of cyclohexanone oxime can reach 89.41% and 98.38% respectively.On the base of plenty preliminary experiments, the reaction mechanism of ammoximation catalyzed by heteropoly acids(salts) is studied. In the proposed mechanism, the Keggin-type heteropoly negative ion is bonded with H2O2 in aqueous phase, forms the active peroxidized heteropoly compounds and transfers most of the peroxidized polyacid into the organic phase, then oxygen is transfered from peroxidized polyacid to the substrate, which catalyzes the ammoximation. Moreover, the electrophilicity of the carbonyl group can increase the acidity of heteropoly compound. This not only creats a suitable condition for the attack of nucleophilic reagent, but also make the hydroxyl group in alcohols and amine protonation, which benefit the formation of cycohexanoxime. Meanwhile, results indicated that high concentration of hydroperoxide has no significant influence on the selectivity of oxime, which supposes that the mechanism of ammoximation is hydroxylamine approach.At the last part of this thesis, on the basis of systemic research experiments, the immobilized catalysts, which supported on silicon dioxide, active carbon and active alumina, are prepared and characterized by BET, FTIR, XRD. Results proved that the active ingredient is combined with carrier and the characteristic structure is unchanged. The result of ammoximation catalyzed by immobilized heteropoly acids(salts) for the first time shows that the Al2O3-based catalyst exhibits the highest activity with a yield of 90.23% and a selectivity of 99.78%, even better than homogeneous catalyst. Though the immobilized catalyst is easily separated, but active ingredient is also easy off-bonded and the reuse of catalyst can not achieve the prospective results.

Chlorine atom and halogen-compounds play important roles in the chlorination of industrial and incineration process of danger halogenated waste. These species will not only damage the ozone layer in the atmosphere but also trigger the greenhouse effect. Such microscopic studies of the mechanism and dynamic nature of these reactions have significant meanings for us to seek to protect the atmospheric environment. Chemical reaction rate constant research and determination have been to focuses of research in the chemical area. To realize forecast the chemical reaction rate constant under different conditions in theory is at the forefront of theoretical chemistry.In this thesis the mechanism of the reactions of Cl with CH₂ICl, CH₃OCl and halogenated acetones in atmosphere have been studied by using ab initio in program Gaussian03. Information of potential energy surface, including the optimized geometries of reactants, products, complexes and transition states together with the harmonic vibration frequencies analysis, reaction barrier and the reaction enthalpy of equilibrium geometries have been obtained. Under the same level, transition states have been set as the starting point and have been calculated the minimum energy path （MEP） through the intrinsic reaction coordinate （IRC）. Further confirmation of the single-point energies are completed under the high-level MC-QCISD and QCISD. To the reaction of Cl with halogenated acetones CH₃COCCl₂X （X = F, Cl and Br）, rate constants have been calculated by program POLYRATE 9.1. The electronic electrostatic potential for the reactant atoms and molecules have also been analyzed.To the reaction of Cl with CH₂ICl, six possible reaction channels have been calculated. Two complexes and six transition states have been found out. The results show that the reaction channel of Cl abstraction is the major channel of six channels and others are minor channels. To the reaction of Cl with CH₃OCl, four possible reaction channels have been calculated. One complex and four transition states have been found out. The results show that the reaction channel of H abstraction is the major channel of four channels and others are minor channels. To the reaction of Cl with halogenated acetones CH₃COCCl₂X （X = F, Cl and Br）, three reactions have been compared. The results show that the reaction barrier of the reaction of Cl with CH₃COCCl₂Br was the lowest and easy to happen. The geometric structure, frequencies and the rate constants through the theoretical calculation are in good agreement with the available experimental value. It further verify the reliability of the theoretical results and provide a good estimate for the kinetics of the reactions in the other temperature range that experiments have not yet been able to.

The condensation of cyclohexanone and glycerol catalyzed by varies catalysts was investigated aiming to study the catalytic mechanism and the effects of catalyst’s structure and property on the conversion of cyclohexanone and the reaction selectivity. The catalytic activities of Lewis acid, proton acid, solid superacid, heteropoly acid, zeolite, montmorillonite and inorganic anhydride were compared. The reaction parameters on the synthesis of menthone glyceryl ketal and cyclohexanone glyceryl ketal were studied and optimized.The result indicates that AlCl3, concentrated sulfuric acid, SO42-/MxOy solid superacid, Hβzeolite, and P2O5 shown higher catalytic activity;and the assayed Lewis acids performed as both Lewis and Bronsted acid. The main factors influencing the catalytic activity of the metallic inorganic salt were: (1) The structure of the Lewis acids: For hydrochloride or sulfate with same anionic moiety, those containing cationic moieties with stronger Lewis acid intensity or larger hydrolysis equilibrium constant performed higher activity and selectivity for 2-methylol-1,4-Dioxaspiro[4,5]decane (a). In addition, the catalytic activity and selectivity of hydrochlorides were higher than that of sulfates if they contain same cationic moieties. (2) The catalytic activity of the hydrated sulfates was significantly influenced by the calcination temperature. The void structure and acidity of solid superacid, zeolite and montmorillonite effect on their catalytic activities, which performed higher selectivity for a, and therefore could be expected to the carriers of other acid catalysts. Product a was favored kinetically, which will transfor to 3-hydroxyl-1,5-Dioxaspiro[5,5]undecane (b) slowly, the later is more stable thermodynamically. With AlCl3 as the catalyst, the reaction mixture obtained after 2 h at the equiblium reaction, and the content of a changed from 97.7% to 94.8% after placing the mixture at room temperature for 60 days.The effect of reactant ratio, reaction time, amount of the AlCl3 and the solvent on the conversion of cyclohexanone and the reaction selectivity was studied, respectively. The prime influence factor was materials ratio. When the molar ratio of the catalyst to reactants was n(AlCl3):n(cyclohexanone):n(glycerol)=1:1000:1500, 10 mL cyclohexane, reaction 92 oC, 1 h, a cyclohexanone conversion of 97.7% and a selectivity for a of 98.0% was achieved, respectively, the product yield was obtained 90.2% (97.4% of purity, GC). AlCl3 can be reused for another 2 runs without obvious deactivity. The reaction conversion was in inverse proportion to the steric hindrance in acetalization.The condensation of menthone and glycerol possible only generate 1,3-dioxolane according to the GC-MS proof. When the molar ratio of catalyst to reactants was n(AlCl3): n(menthone):n(glycerol)=1:100:150, 10 mL cyclohexane, 2 h, a menthone conversion of 43.6% was obtained; and the product yield was obtained as 35.1% (99.1% of purity, GC).

Egg White (EW) has good ability of gelling while fresh EW can not be stored for a long time, after being processed into Egg White powder (EWP) it can be used as a kind of safe and convenient additive in many fields. Nowadays, people pay more and more attention on the EWP with special functional properties. On the basis of prevenient study in this area, many methods were used to improve the gel strength of egg white powder such as dry-heating, microwave radiation and Maillard reaction, so as to widen its application in food industry.The rheology character and effects of medium on the gelling property of EWP were discussed which showed that the gel structure developed when temperature approached 72℃; the gel strength increased according to the increase of protein concentration, and when the pH of EWP solutions was adjusted to 4.0 and 9.0 the gel strength was higher. However, the gel formed at pH 2.0-3.0 was the softest. When pH reached 4.0 the gel strength dramatically decreased with the addition of NaCl.The process of dry-heating was investigated. The environmental relative humidity was controlled below 51%, after being dry-heated at 80-110℃for several days dry-heated egg white powder (DH-EWP) could form a gel whose hardness increased from 650 g to 2500 g. The gel form temperature of DH-EWP was 65℃.Microwave radiation method was firstly used to modify the EWP for high gel strength. The microwave radiated egg white powder (MR-EWP) was radiated under 600W work powder for 130s and it could form a gel with strength at 1300 g, gel form temperature at 70℃. Study of hydrophobicity, free sulfhydrxyl groups, molecular weight, secondary structure of MR-EWP and EWP indicated that the proteins were partly denatured and polymerized.Maltodextrin as raw material, Maillard reaction was firstly combined with fermentation in order to innovate the EWP denature process, first maltodextrin solution were put into egg white liquor, and then some low molecular sugar was removed by fermentation before drying and dry heating, so the brown reaction was reduced meanwhile the good effects of Maillard reaction were fully used. It concluded that this method can accelerate the speed of gel enhance, the M-EWP (Maillard-reacted EWP) could form a gel whose strength was 3300 g with a higher tolerance to pH. The gel form temperature of M-EWP was 67℃. The study of hydrophobicity, free sulfhydrxyl groups, molecular weight and secondary structure of the M-EWP and EWP indicated that the proteins were also partly denatured and polymerized during modification, and the increase of high molecular weight protein. It was conferred that the higher concentration of high molecular weight protein polymer cause Maillard-reacted DEW with higher gel strength than DH-EWP.

Egg White (EW) has good ability of gelling while fresh EW can not be stored for a long time, after being processed into Egg White powder (EWP) it can be used as a kind of safe and convenient additive in many fields. Nowadays, people pay more and more attention on the EWP with special functional properties. On the basis of prevenient study in this area, many methods were used to improve the gel strength of egg white powder such as dry-heating, microwave radiation and Maillard reaction, so as to widen its application in food industry.The rheology character and effects of medium on the gelling property of EWP were discussed which showed that the gel structure developed when temperature approached 72℃; the gel strength increased according to the increase of protein concentration, and when the pH of EWP solutions was adjusted to 4.0 and 9.0 the gel strength was higher. However, the gel formed at pH 2.0-3.0 was the softest. When pH reached 4.0 the gel strength dramatically decreased with the addition of NaCl.The process of dry-heating was investigated. The environmental relative humidity was controlled below 51%, after being dry-heated at 80-110℃for several days dry-heated egg white powder (DH-EWP) could form a gel whose hardness increased from 650 g to 2500 g. The gel form temperature of DH-EWP was 65℃.Microwave radiation method was firstly used to modify the EWP for high gel strength. The microwave radiated egg white powder (MR-EWP) was radiated under 600W work powder for 130s and it could form a gel with strength at 1300 g, gel form temperature at 70℃. Study of hydrophobicity, free sulfhydrxyl groups, molecular weight, secondary structure of MR-EWP and EWP indicated that the proteins were partly denatured and polymerized.Maltodextrin as raw material, Maillard reaction was firstly combined with fermentation in order to innovate the EWP denature process, first maltodextrin solution were put into egg white liquor, and then some low molecular sugar was removed by fermentation before drying and dry heating, so the brown reaction was reduced meanwhile the good effects of Maillard reaction were fully used. It concluded that this method can accelerate the speed of gel enhance, the M-EWP (Maillard-reacted EWP) could form a gel whose strength was 3300 g with a higher tolerance to pH. The gel form temperature of M-EWP was 67℃. The study of hydrophobicity, free sulfhydrxyl groups, molecular weight and secondary structure of the M-EWP and EWP indicated that the proteins were also partly denatured and polymerized during modification, and the increase of high molecular weight protein. It was conferred that the higher concentration of high molecular weight protein polymer cause Maillard-reacted DEW with higher gel strength than DH-EWP.

This research selected four plants that can concentrate and tolerate cadmium toconstruct two kinds of Integrated Vertical Flow Constructed Wetlands Systems(ⅠVCW)and Improving Integrated Vertical Flow Constructed Wetlands Systems(ⅡVCW).The structures of constructed wetlands,the the growth condition of plants in the Wetland,the effect of removing the Cd,the regularity of distribution of Cd and organic matter in the Wetland were studied,which just in order to find out the better combinations, plants and structures to remove the cadmium from wastewater by the wetland and obtaining some mechanisms about the removal efficiency of Cd.These results will provide the theory basis and practical experience for cadmium wastewater treatment with integrated vertical flow constructed wetlands in the future.The main results as follows:1.Results of the hydroponic experiment indicated that Echinodorus osiris,Tonina Fluviatilis,Cannal L and Coleus blumei Benth had good the tolerance in Cd patients,absorption and accumulation.Under the Cd stress, The Canna L has the most tolerance and absorption to the Cd,Echinodorus osiris was second,Tonina Fluviatilis was third,Coleus blumei Benth was last.2、The cadmium wastewater purification effect were well for both kinds of constructed wetland from the result of experiment.In the same constructed wetland,the removal rate of cadmium was better with plants than without plants.The removal rate of cadmium in theⅡVCW was better than in theⅠVCW with the same plants.The removal rate of cadmium was better planting Canna L and Echinodorus osiris than planting Tonina Fluviatilis and Coleus blumei Benth.In a word,the purification efficiency of Cd inⅡVCW was always better than inⅠVCW,and the constructed wetland planting Canna L and Echinodorus osiris was better than planting Tonina Fluviatilis and Coleus blumei Benth obviously.3.The contents of the organic carbon and Cd in the constructed wetland were:the upper layer(0-5cm)＞the middle layer(5-15cm)＞lower layer (15-20cm).With the increase of the depth,the concentration of Cd and organic carbon will be also decreased.4.Through the correlation analysis,we found that there were remarkable correlations between the proline and the content of Cd,the content of Cd and organic carbon in the constructed Wetland,the content of effective Cd and total Cd in the constructed Wetland,the increase in height of the plants and the content of effective Cd in the constructed Wetland.5.Considering the result above,the group of the Canna and Echinodorus osiris in the structure ofⅡVCW had the best purification effect to the Cd.

Basing on the review of the status and treatment of oilfield wastewater containing Polyacrylamide（PAM）, and aiming at the characteristics of the wastewater, we can come to the conclusion that the key processes of the wastewater was oxidative degradation of the polyacrylamide （PAM）. We research on oxidative degradation of PAM sewage using the Fenton reagent, the TiO₂ photochemical catalysis and the potassium ferrate. Under three kinds of systems, The effect of conditions such as initial pH value, reaction temperature was researched on the PAM degradation.At the same time, we also researched the kinetics of PAM oxidative degradation under the optimized condition, and the conclusions were carried out. In the Fenton system the PAM degeneration reaction follows a first order kinetics; under the TiO₂ photochemical catalysis condition the reaction order of PAM degradation is 2.5, but in the potassium ferrate system the reaction order of PAM oxidative degradation is 1.9.The intermediate products of PAM degradation were detected by HPLC, basing on the results of HPLC detection we speculated the oxidative degradation mechanism: PAM is degraded to the organic acid of small members and the acrylic amide monomer, which will be degraded into the inorganic compounds if increasing reaction time.