As organchlorine pesticides(OCPs) may be an ecologic threat to mountain environments due to their tendency to deposit and accumulate in mountain regions undergoing long-range air transport, OCPs were analyzed in soils...As organchlorine pesticides(OCPs) may be an ecologic threat to mountain environments due to their tendency to deposit and accumulate in mountain regions undergoing long-range air transport, OCPs were analyzed in soils collected from an intermontane basin of the western Tian Shan Mountains, which is the UNESCO protected natural reserve of Issyk-Kul. Total OCP concentrations in the Issyk-Kul region ranged from 4.63 to 414 ng/g dw, of which two extraordinary high OCP concentrations(414 ng/g dw and 213 ng/g dw, respectively) influenced by an abandoned dumping site and urban sewage, respectively, were found. Principal component analysis(PCA) and correlation analysis inferred that the OCP inputs in the east of the Issyk-Kul region were mainly from local endogenous sources, and exogenous input via LRAT processes were prominent in the west and south. Additionally, the isomeric and parent substance/metabolite ratios revealed most pesticides accumulated in this region were from old usage, while DDTs had fresh input because of possibly illegal regional application and a slow degradation from the dumping site. Furthermore, ecological risk assessment revealed that no frequently adverse ecological effects were observed in the Issyk-Kul region, but potential risks on neighbouring organisms induced by p,p'-DDT and γ-HCH in dumping site and urban sewage should be considered when devising an efficient management plan to prevent secondary pollution.展开更多
目的：测定不同产地的丹参药材中8种有机氯农药的残留。方法随机抽取样品，经有机溶剂超声提取，浓硫酸磺化后，用rtx-5弹性石英毛细管柱（30 m × 0．25 mm × 0．25μm）经程序升温技术分离，用电子捕获检测器（ ECD）检测，...目的：测定不同产地的丹参药材中8种有机氯农药的残留。方法随机抽取样品，经有机溶剂超声提取，浓硫酸磺化后，用rtx-5弹性石英毛细管柱（30 m × 0．25 mm × 0．25μm）经程序升温技术分离，用电子捕获检测器（ ECD）检测，根据色谱峰的保留时间定性，外标法计算含量。结果该方法的加样回收率在85％-105％之间，在一定范围内呈线性良好关系。结论该方法灵敏、准确，适合于丹参中有机氯农药残留的研究，同时丹参中含有一定量的残留农药，在使用时应重视其质量问题。展开更多
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences,Pan-Third Pole Environment Study for a Green Silk Road (Grant No.XDA2006030101)the National Natural Science Foundation of China (Grant Nos.41671200,U1603242,41671477)
文摘As organchlorine pesticides(OCPs) may be an ecologic threat to mountain environments due to their tendency to deposit and accumulate in mountain regions undergoing long-range air transport, OCPs were analyzed in soils collected from an intermontane basin of the western Tian Shan Mountains, which is the UNESCO protected natural reserve of Issyk-Kul. Total OCP concentrations in the Issyk-Kul region ranged from 4.63 to 414 ng/g dw, of which two extraordinary high OCP concentrations(414 ng/g dw and 213 ng/g dw, respectively) influenced by an abandoned dumping site and urban sewage, respectively, were found. Principal component analysis(PCA) and correlation analysis inferred that the OCP inputs in the east of the Issyk-Kul region were mainly from local endogenous sources, and exogenous input via LRAT processes were prominent in the west and south. Additionally, the isomeric and parent substance/metabolite ratios revealed most pesticides accumulated in this region were from old usage, while DDTs had fresh input because of possibly illegal regional application and a slow degradation from the dumping site. Furthermore, ecological risk assessment revealed that no frequently adverse ecological effects were observed in the Issyk-Kul region, but potential risks on neighbouring organisms induced by p,p'-DDT and γ-HCH in dumping site and urban sewage should be considered when devising an efficient management plan to prevent secondary pollution.
文摘目的：测定不同产地的丹参药材中8种有机氯农药的残留。方法随机抽取样品，经有机溶剂超声提取，浓硫酸磺化后，用rtx-5弹性石英毛细管柱（30 m × 0．25 mm × 0．25μm）经程序升温技术分离，用电子捕获检测器（ ECD）检测，根据色谱峰的保留时间定性，外标法计算含量。结果该方法的加样回收率在85％-105％之间，在一定范围内呈线性良好关系。结论该方法灵敏、准确，适合于丹参中有机氯农药残留的研究，同时丹参中含有一定量的残留农药，在使用时应重视其质量问题。
