Spatial variability of organochlorine pesticides (DDTs and HCHs) in surface soils from the alluvial region of Beijing, China
ZHANG Hong-yan , GAO Ru-tai , HUANG Yuan-fang , JIA Xiao-hong , JIANG Shu-ren
DOI:
Received February 17, 2006,Revised April 24, 2006, Accepted , Available online
Volume 19,2007,Pages 194-199
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The spatial variability of concentrations of 1, 2, 3, 4, 5, 6-hexachlorocyclohexane (HCH) and 1, 1, 1-trichloro-2, 2-bis (p-chlorophenyl) ethane (DDT) in surface soils was studied, based on the analysis of 131 soil samples collected from a surface layer (0-20 cm depth) of the alluvial region of Beijing, China. The concentrations of total HCHs (including α-, ?-, ?-, ?-isomers) and total DDTs (including p, p'-DDT, p, p'-DDD, p, p'-DDE, o, p'-DDT) in the surface soils were tested in the range from non-detectable to 31.72 μg/kg dry soil with a mean value of 0.91 and from non-detectable to 5910.83 μg/kg dry soil with a mean value of 32.13, respectively. We observed that concentrations of HCHs in all soil samples and concentrations of DDTs in 112 soil samples were much lower than the first grade (50 μg/kg) permitted in “Environment quality standard for soils in China (GB15618-1995)”. This suggests that the organochlorine pesticides pollution was generally not significant in the farmland soils in Beijing alluvial region. [P+M] The spatial distribution and tendency of HCHs and DDTs were analyzed using Geostatistical Analyst and GS+(513) in this study. Spatial distribution indicated the historical application of these pesticides. Trend analysis showed that concentrations of HCHs, DDTs and their related metabolites followed an obvious distribution trend in the surface soils from the alluvial region of Beijing.
