LIU Maolin1,2, LIU Hongxia1,2, WU Donghui1,2, ZHENG Jingru1,2, ZHAN Changlin1,2, ZHANG Jiaquan1,2, YAO Ruizhen1,2, LIU Ting1,2, XIAO Wensheng1,2
（1.Hubei Polytechnic University, Huangshi, 435003, China;
2. Hubei Key Laboratory of Mine Environmental Pollution Control & Remediation, Hubei Polytechnic University, Huangshi, 435003, China）
Abstract: Composition, source and soil-air exchange of organochlorine pesticides (OCPs) in the atmosphere of Yaer Lake area, a typical OCPs polluted area, were studied by sampling atmospheric samples with polyurethane foam-passive sampling method (PUF-PAS). Results showed that Aldrin, DDTs, HCHs, HCB, Methoxychlor and α-Endosulfan were main OCPs components and accounted for 84% of the total amount of OCPs in the atmosphere. It should be noted that Aldrin existed extensively in high concentration (average of 161.25 pg/m3), and average concentrations of HCHs and DDTs in the atmosphere of study area were 89.64 and 92.29 pg/m3, respectively, the pollution was remarkable compared with other areas. The concentration of β-HCH was higher than that of α-HCH and much higher than those of γ-HCH and δ-HCH, indicating that HCHs had been stabilized after a long degradation process and that HCHs came from industrial releasing and subjected the long-distant atmospheric transport. The spatial distribution of DDTs was different from that of HCHs, six DDTs isomers distributed differently at different sampling points since of the varied pesticide usages and geographical locations. The source identification inferred that DDTs were mainly from historical residues. The study of soil-air exchange of OCPs in the Yaer Lake area suggested that the predominant soil-air exchange of HCHs was the precipitation from air to soil, and the soil-air exchange of DDTs was mainly volatilization from soil to air at most of sampling points and was controlled by the long-distant atmospheric transport at others.
Key words: Yaer Lake; organochlorine pesticides; atmosphere; fugacity; soil-air exchange
EARTH AND ENVIRONMENT Vol.46, No.5, Tot No.325, 2018, Page 422-428
