小白菜和土壤中壬基酚残留降解研究

本实验建立完善了小白菜和土壤中痕量NP的检测方法-固相萃取-高效液相色谱-质谱联用,开展了模拟田间施药情况下,壬基酚在小白菜和土壤中的消解动态研究。结果表明：在1～100ng/mL浓度范围内,壬基酚浓度与其峰面积呈良好的线性关系,方法检出限可以满足壬基酚残留检测的最低要求。整个试验期间,除壬基酚水溶液处理外,其他处理NP含量最终都在0.05mg/kg左右,可能提示NP的降解具有一定的阈值。同时,壬基酚在小白菜和土壤中的残留量随着施药后的时间变化以近似负指数函数递减的规律变化,消解规律不符合一级动力学模型,其半衰期为23～100d。

Study on Degradation of Nonylphenol Residues in Cabbage and Soil

Based on the solid phase extraction-high performance liquid chromatography（HPLC）- mass spectrometry method,we further optimize the existing rapid detection technology of nonylphenol in cabbage sample matrix. In the NP mass concentration in 1～100ng/mL concentration range,the concentration had good linear relationship with its peak area,the detection limit can satisfy the minimum requirements of nonylphenol residues. Resolution of nonylphenol in cabbage and soil,the dynamic was studied. The results show that under the condition of different doses of pesticide spraying powder on cabbage,in addition to the aqueous solution of NP,during the entire test the NP content remains 0.05mg/kg. It indicates the degradation of NP has a certain threshold. At the same time,the residual amount of nonylphenol on the crops and the environment（ concentration） will,after applying pesticide show a diminishing negative exponential function change. Its resolution rule is not in conformity with the first order kinetics model,its half-life is 23～100d.