Organochlorine pesticides in soils from the Issyk-Kul region in the western Tian Shan Mountains, Kyrgyzstan:Implication for spatial distribution, source apportionment and ecological risk assessment

• 来源期刊: 山地科学学报（英文版）
• 年，卷（期）: 2018,（7）
• 页码范围: 1520-1531
• 页数: 12页
• 语种: 英文

摘要

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.