Info utili

Valutazione attuale:  / 2

Spatial and seasonal variations of atmospheric organochlorine pesticides along the plain-mountain transect in central China: Regional source vs. long-range transport and airesoil exchange

Chengkai Qu a, c, Xinli Xing a, b, *, Stefano Albanese c, Angela Doherty c, Huanfang Huang a, Annamaria Lima c, Shihua Qi a, **, Benedetto De Vivo c
a State Key Laboratory of Biogeology and Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
b Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
c Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Universita degli Studi di Napoli “Federico II”, Via Mezzocannone 8, Naples 80134, Italy
Atmospheric Environment
journal homepage: www.elsevier.com/locate/atmosenv
H i g h l i g h t s
 Variations in spatial and seasonal concentration of atmospheric OCPs were observed.
 Since 2005, levels of atmospheric legacy OCPs decreased while Endosulfan increases.
 The plains act as an OCP contaminant emitter to atmosphere.
 Seasonal fluctuation of atmospheric OCPs are linked to the East Asian monsoon.
Polyurethane foam (PUF) disk passive air samplers (PAS) were deployed to measure spatiality and seasonality of atmospheric OCPs in Jianghan Plain (JHP) and Western Hubei Mountain (WHM), to make a preliminary explorative study of the sourceesink relationship of organochlorine pesticides (OCPs) and their association with the monsoon. The concentrations of individual OCPs in the JHP were generally higher than those in the WHM. Significantly high levels of DDTs and Endosulfan were found in the spring and summer, HCB was found in autumn and winter, and HCHs displayed uniform distributions. Compared with the levels of 2005, a significant decrease of atmospheric HCHs, DDTs and HCB was
observed, whereas an increase in Endosulfan was observed. The airesoil equilibrium status of OCPs suggested that Dajiuhu (DJH) soils are likely to be a sink for OCPs, and JHP soils are acting as the emitter, contaminating the atmosphere at certain monitoring stations. Backward air trajectory analysis demonstrated that the seasonal fluctuation of atmospheric DDTs, HCB and Endosulfan at the DJH site were closely associated with the variations of the East Asian monsoon.
Keywords: Organochlorine pesticides, Passive air sampling, Plain, Mountain, Airesoil exchange, East Asia monsoon