道路灰尘中有机氯农药的污染特征

系统探讨了新乡市道路灰尘中有机氯农药(OCPs)的含量、分布,解析了道路灰尘中OCPs的来源,评价了新乡市道路灰尘中OCPs的生态风险.结果表明,新乡市道路灰尘中16种OCPs的总量范围为2.37⁷24.74ng/g,平均含量为155.54ng/g.DDTs,HCB,HCHs是新乡市道路灰尘中检出的主要OCPs,检出率均为100%,含量分别为32.26ng/g(1.09724.74ng/g,平均含量为155.54ng/g.DDTs,HCB,HCHs是新乡市道路灰尘中检出的主要OCPs,检出率均为100%,含量分别为32.26ng/g(1.09¹65.31ng/g),114.96ng/g(0.58165.31ng/g),114.96ng/g(0.58⁶93.28ng/g),4.51ng/g(0.36693.28ng/g),4.51ng/g(0.36¹4.10ng/g),占总OCPs的比例分别为39.07%,45.16%,10.98%.通过对HCHs,DDTs,氯丹组成特征的分析,表明新乡市道路灰尘中的OCPs主要来源于历史上OCPs的使用.根据沉积物风险评估值,新乡市道路灰尘中的OCPs存在较高的生态风险.

Pollution Characteristics of OCPs in Road Dust

The levels of organochlorine pesticides(OCPs)in urban road dust from Xinxiang have been detected.The source of OCPs in road dusts has been identified and their ecological risk has been evaluated.The results indicated that total concentration of 16OCPs ranged from 2.3714.10ng/g),占总OCPs的比例分别为39.07%,45.16%,10.98%.通过对HCHs,DDTs,氯丹组成特征的分析,表明新乡市道路灰尘中的OCPs主要来源于历史上OCPs的使用.根据沉积物风险评估值,新乡市道路灰尘中的OCPs存在较高的生态风险.The levels of organochlorine pesticides(OCPs)in urban road dust from Xinxiang have been detected.The source of OCPs in road dusts has been identified and their ecological risk has been evaluated.The results indicated that total concentration of 16OCPs ranged from 2.37⁷24.74ng/g,with an average level of 155.54ng/g.Dichlorodiphenyltrichloroethanes(DDTs),Hexachlorobenzene(HCB)and Hexachlorcyclohexane(HCHs),with detection rates of 100%,were identified to be the predominant components of OCPs,accounting for 39.07%,45.16% and 10.98% of total OCPs,respectively.The average concentration of DDTs,HCB and HCHs were 114.96ng/g(0.58724.74ng/g,with an average level of 155.54ng/g.Dichlorodiphenyltrichloroethanes(DDTs),Hexachlorobenzene(HCB)and Hexachlorcyclohexane(HCHs),with detection rates of 100%,were identified to be the predominant components of OCPs,accounting for 39.07%,45.16% and 10.98% of total OCPs,respectively.The average concentration of DDTs,HCB and HCHs were 114.96ng/g(0.58⁶93.28ng/g),32.26ng/g(1.09693.28ng/g),32.26ng/g(1.09¹65.31ng/g)and 4.51ng/g(0.36165.31ng/g)and 4.51ng/g(0.36¹4.10ng/g),respectively.Composition analysis of HCHs indicated historical usage was the main source of OCPs in road dust from Xinxiang.The same conclusion was summarized from the ratio of(DDE+DDD)/DDTs and trans-chlordane(TC)/cis-chlordane(CC).According to risk evaluation which can also be applied for sediment,OCPs pollution in road dust from Xinxiang posed a little high ecological risk.