Concentrations and source identification of organochlorine pesticides (OCPs) in soils from Wolong Natural Reserve |
| |
Authors: | XiaoYan Zheng XianDe Liu WenJie Liu GuiBin Jiang RuiQiang Yang |
| |
Institution: | (1) State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;(2) Chinese Research Academy of Environmental Sciences, Beijing, 100012, China |
| |
Abstract: | In order to understand the distribution profile, composition characteristics and sources of OCPs, soil samples collected from
Wolong Natural Reserve (WNR) in spring and autumn in 2005 were analyzed using gas chromatography coupled with electron capture
detector (GC-ECD). Results showed that all OCPs concentrations were in the range of 10−2 ng/g−10−1 ng/g, representing the background level in those remote sites. Generally, their concentrations were slightly higher in spring
than in autumn, which could be explained by OCPs: 1) may be released to soil from snow-melting water in spring; 2) partially
evaporate into air from soil due to high temperature and intense radiation in summer and 3) can be relatively high degradation
rate in summer. There were notable differences of OCPs seasonal variations between samples from alpine meadow and those from
under-treeline. This phenomenon was related to physical-chemical properties of OCPs and vegetation coverage. For alpine meadow
soils, levels of OCPs were increased with increasing altitudinal gradient, which was associated with enhanced scavenging efficiency
of wet precipitation. Composition characteristics of OCPs in soils were similar to those of air samples, which was distinct
from those of typical contaminated soils, indicating that OCPs in WNR soils were mainly from atmospheric transport.
Supported by the National Basic Research Program of China (Grant No. 2003CB415003) |
| |
Keywords: | OCPs soil seasonal variation composition characteristics source identification |
本文献已被 CNKI SpringerLink 等数据库收录! |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |
|