The Environmental Pollution Characteristics Of Nonylphenol

Our country was enormous use of pesticides, and the pesticide adjuvant as one of the main ingredients of pesticides, the environmental issues had received increasing attention. pesticide adjuvant which was Safety and efficiently was on rise, Safety management process of pesticide adjuvant need to be promoted. Under this background, it has important practical significance to investigate the residues of high-risk pesticide adjuvant on soils and exploratory study their environmental behavior. It will enhance the safety management of pesticide adjuvant and promote the study of new green pesticide adjuvant.Residues of high-risk pesticide adjuvants, Nonylphenol (NP), in five different soils were investigated by using high performance liquid chromatography-mass spectrometry. The sorption, leaching and degradation of nonylphenol ether in Nanjing yellow-brown soil, Jiangxi red soil, Changshu orchard soil, Taihu paddy soil, and Northeast China black soil investigated in laboratory.The main results were as follows:(1)This paper establelished the method for determination of nonylphenol in soil、 water and sediment. After ultrasonic extraction by methanol and ethyl acetate(4:l,v:v), liquid-liquid extraction by dichlormethane, the soil samples were detected by UPLC-EIS-MS/MS with the detection limit between 2.90-24.3ng/L and recoveries between 72.7%-86.5%. The water samples were detected by UPLC-ESI-MS/MS after concentrated and purified by Oasis HLB column, and the recoveries were 93.1%-98.8%.(2)The behavioral characteristics of nonylphenol in the five different soils. The main results were as follows:Degradation experiment results showed that under aerobic condition, nonylphenol degradation in five siols can be well described by the first dynamic equation. The degradation trend of nonylphenol was fast at early phase, and then became slow, tend to balance at last. The degradation of NP was divided into fast-degradation phase and slow-degradation phase, and the degradation half-lifes (t1/2) in fast-degradation phase were 14.1.18.2.19.2.20.4.25.7d and in slow-degradation (t1/2) phase were 46.2.63.0.69.3.77.0.77.Od. The degradation rates of nonylphenol was associated with soil organic matter content. Different combinations with soil and the degradability of different isomers is different could be factors of the existence of slow stage. Under conditions of stagnant water, nonylphenol has slow degradation.200d of the remaining in Northeast China black soil, Taihu paddy soil and Nanjing yellow-brown soil were 78%,59% and 53% respectively. the degradation half-lifes (t1/2) of Jiangxi red soil and Changshu orchard soil were 86.6d and 90.Od, bigger than half-lifes (ti/2) underaerobic condition. soil microbial species and biological activity was an important factor which affected nonylphenol degradation in different conditions.Adsorption results showed that the adsorption of nonylphenol onto tested soils fitted well with Freundlich model, and the adsorption coefficient (Kd) was 18.89 for Nanjing yellow-brown soil,26.64 for Jiangxi red soil,44.15 for Changshu orchard soil,47.49 for Taihu paddy soil, and 69.92 for Northeast China black soil, respectively. The adsorption capacity ranked as Nanjing yellow-brown soil<Jiangxi red soil<Changshu orchard soil<Taihu paddy soil<Northeast China black soil. The adsorption of nonylphenol onto soil was primarily related to the organic carbon in soils. The Kd values of nonylphenolincreased with the increase of organic carbon in soil. Moreover, the adsorption free energy of nonylphenol in tested soils ranked from-21.02 to-19.77kJ·mol-1, indicating that the adsorption process could be largely attributed to the physical adsorption.Column test showed that the motion of nonylphenol was insignificant, and the nonylphenol moved a distance of 1-6cm in Nanjing yellow-brown soil and 1-3cm in other soils. The result of mobility test showed that nonylphenol did not leach out. The soil organic matter content in soils was a dominant factor influencing the mobility of nonylphenol, which was in accordance with the adsorption results.(3) nvestigation results of the nonylphenol in Taihu lake showed that the RQwater of NP in the environmental water of Taihu lake was between 0.006-0.691 for NP environmental risk assessment report based on EU. The RQsediment of NP in the sediment was between 0.06-2.073. It can be found that there are nearly 68% water in the Taihu Lake in the state of low risk,32% of the waterin a moderate risk state. There were 49% sediments in a low risk state,44% in the state of moderate risk,17% in a high risk state. The concentration of NP in the surface waters of the Taihu River Basin was all lower than the chronic toxicity concentration standard and Acute toxicity concentration standard of NP in fresh water.