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Abstract
The organochlorine pesticides (OCPs) in the atmosphere were measured at four sampling sites located in Guangzhou (GZ), Zhaoqing (ZQ) and Hong Kong (HK) over the Pearl River Delta Region (PRDR) in one year duration from August 2006 to August 2007. Total 14 OCP species in the gas phase including 6 DDTs, 2 Chlordanes, 4 HCHs, HCB and heptachlor (HEP) were studied. It was found that Guangzhou had the highest concentration of DDTs and the mean concentrations of OCPs at these sampling sites were higher than those obtained in other rural/urban regions in the world. The concentrations of most OCPs in summer were higher than those in winter excluding TC, HCB and HCH. The ratios of α- to γ-HCH and o,p′- to p,p′-DDT showed that HCHs in GZ and ZQ might come from the current usage of lindane and dicofol, but in HK might be from other sources. The results using 5 days backward air trajectory analysis indicated that the high concentrations of γ-HCH and HCB were mainly related to air mass through the potential source regions through long-range transport and local usage should not be overlooked.
Highlights
Due to their semi-volatility, toxicity and persistence in the environment and biological accumulation via food chain, persistent organic pollutants (POPs), such as polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and polychlorinated dibenzo-p-dioxins/ dibenzofurans (PCDD/Fs) and so on can cause environment pollution and influence human health. (Colborn et al, 1996; Chiu et al, 2010; Lin et al, 2010; Wang et al, 2010; Wu et al, 2010)
The organochlorine pesticides (OCPs) in the atmosphere were measured at four sampling sites located in Guangzhou (GZ), Zhaoqing (ZQ) and Hong Kong (HK) over the Pearl River Delta Region (PRDR) in one year duration from August 2006 to August 2007
The ratios of α- to γ-HCH and o,p′- to p,p′-DDT showed that HCHs in GZ and ZQ might come from the current usage of lindane and dicofol, but in HK might be from other sources
Summary
Concentrations of OCPs in Air Total of 78 PUF samples in the four sampling sites were collected. It may indicate that there were fresh inputs of HCH in the PRD region Among these four sampling sites, the concentration of HCHs of ZQ was the highest because of the developing agriculture usages there. High α-HCH/γ-HCH ratio indicates the input of technical HCH and from lindane (Iwata et al, 1993; Granier and Chevreuil et al, 1997; Haugen et al, 1998; Willet et al, 1998; Wu et al, 2005). The α-HCH/γ-HCH ratios were low in summer due to the usage of lindane as a seed dressing or as a general pesticide (Yang et al, 2008).
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