丹江口水库淅川淹没区农田土壤中有机氯农药的分布特征及生态风险研究  

Distribution Characteristics and the Potential Risk of Organoclorine Pesticides in the Soil from Xichuan Submerged Area Around Danjiangkou Reservoir

作　　者：邰超[1] 周天健[1] 赵同谦[1] 武俐[1] 王晴晴[1] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454000

出　　处：《农业环境科学学报》2010年第4期680-685,共6页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(40701160);河南省高校科技创新人才支持计划(2008HASTIT004);河南理工大学博士基金(648608)

摘　　要：采集了丹江口淅川淹没区高程在170m以下8个乡镇的农田土壤共18个样品,采用索氏提取分离富集、气相色谱-电子捕获(GC-ECD)检测、气相色谱仪-质谱(GC-MS)确证的方法对样品中20种有机氯农药进行了分析,研究了丹江口水库淅川淹没区土壤中OCPs的分布特征与潜在风险。结果表明,研究区农田土壤中有α-HCH和DDE两种有机氯农药被检出,其中α-HCH含量范围是nd～107.55ng·g-1,平均值为40.31ng·g-1;DDE含量范围是1.42～237.56ng·g-1,平均值为36.28ng·g-1。总有机氯含量范围为15.16～279.93ng·g-1,平均值为76.59ng·g-1;与其他地区比较,ΣHCHs含量偏高,ΣDDTs含量相当;α-HCH可能来自早期残留,也可能来自大气沉降,DDE可能源自早期残留。淅川淹没区农田土壤中α-HCH和DDE含量基本上符合国家土壤环境质量标准一级标准,土壤质量良好,但仍然存在一定的生态风险。The distribution characteristics and potential ecological risk of organochlorine pesticides（OCPs） in the soil from Xichuan submerged area around Danjiangkou Reservoir were studied. Eighteen soil samples were collected from farm land at June 2008, after separated and concentrated by Soxhlet extration, twenty kinds of organochlorine pesticides（OCPs ） in the samples from the Xichuan submerged area were analyzed by gas chromatography. Two of OCPs （α-HCH and DDE） were detected, with the detected ratio of 99.44%-100% and the content range of 15.16-279.93 ng·g^-1 Content of α-HCH ranged from nd to 107.55 ng·g^-1 with 40.31 ng·g^-1 as average. Content of DDE ranged from 1.42 to 237.56 ng·g^-1 with 36.28 ng·g^-1 as average. In comparisons with other areas, the mean value of α-HCH content in present study area was a little higher, and DDE was at the same content level. α-HCH and DDE were almost both lower than the limited value of the standard defined by Environmental Quality Standards for soils in China, while the soils from Xichuan submerged area pose a little high risk comparing with ERL and ERM value basing on risk evaluation.

关 键 词：有机氯农药(OCPs) 农田土壤 分布特征 潜在风险 

分 类 号：X53[环境科学与工程—环境工程]