【摘要】 研究了江苏省苏州吴中区农田土壤中持久性有毒污染物(PTS),包括六六六(HCHs)、滴滴涕(DDTs)、多氯联苯(PCBs)和多环芳烃(PAHs)的现状。土壤样品用微波萃取后分别用GC、GC/MS和HPLC方法进行分析。结果表明,HCHs、DDTs、PCBs和PAHs的浓度分别在<0.10μg/kg~916μg/kg、<0.10μg/kg~113μg/kg、5.53μg/kg~22.4μg/kg和3.40μg/kg~36.6μg/kg。HCHs和DDTs的含量与23年前比,已有显著降低;PCBs和PAHs的毒性效应评估处于低水平。β-HCH、PCB28以及4环、5环和6环的PAHs检出率较高,4环和5环的PAHs含量之间还具有较好的相关性。总体而言,吴中区农田土壤中的上述污染物含量较低,但具有较长农耕历史的地区污染情况仍值得关注。更多还原

【Abstract】 Contamination status of persistent toxic substances(PTS)including HCHs,DDTs,PCBs and PAHs was studied in agricultural soil of Wuzhong District of Suzhou,Jiangsu Province. The soil was analyzed by GC,GC/MS and HPLC coupled with microwave extraction. Results showed that the concentrations of HCHs,DDTs,PCBs and PAHs ranged from <0.10~ 916μg/kg,<0.10~133μg/kg,5.53~22.4μg/kg and 3.40~36.6μg/kg respectively. Compared with data 23 years ago,concentrations of HCHs and DDTs had significantly decreased. None of soil PCBs and PAHs concentration suggested a serious biological threat in investigated area. β – HCH,PCB28 and PAHs with 4,5 and 6 rings were frequently detected. Significant relationships were found between the concentration of PAHs with 4 rings and with 5 rings. Levels of pollutants in soil of the area were relatively low,but cautions should be taken for areas with long agricultural history.更多还原