Spatial variability and temporal trends of HCH and DDT in soils around Beijing Guanting Reservoir, China

Abstract

Spatial variability and temporal trends in concentrations of the organochlorine pesticides (OCPs), hexachlorocyclohexane (HCH) and dichlorodiphenyltrichloroethane (DDT), in surface soils around Beijing Guanting Reservoir (GTR) were studied in 2003 and 2007. Concentrations of the two OCPs in soils around GTR were generally less than reference values set by the Chinese government for the protection of agricultural production and human health. Among the OCPs, b-HCH and p, p 0 -DDE were the two predominant compounds. This result indicates that the HCH and DDT residues in soils were primarily from historical use. Based on kriging, a spatial distribution of HCH and DDT around the GTR was observed. Spatial variability indicated how HCH and DDT had been applied and been distributed in the past. Between 2003 and 2007, concentrations of HCH and DDT decreased more rapidly in orchard soils than those in fallow soils.

HCHs and DDTs in Soils around Guanting Reservoir in Beijing, China: Spatial-Temporal Variation and Countermeasures

“…By comparing with previously reported results [16, 18, 19], it can be seen that DDTs have always been the main components of pesticidal POPs in the Guanting Reservoir area, that is, 93.2% in 2003, 90.2% in 2007, and 90.6% in 2009, respectively. Figure 2 shows that the concentration of pp′-DDE in soil is the greatest in 2009.…”

Characteristics of residual organochlorine pesticides in soils under different land-use types on a coastal plain of the Yellow River Delta

“…3a). Previous studies have found that b-HCH and p,p 0 -DDE could be the main residues in farmland soil with longer cultivation history due to the transformation of HCH and DDT into their stable isomer and metabolite (Zhang et al 2006;Hu et al 2010;Gao et al 2013;Yu et al 2013). The accumulation of the b-HCH and p,p 0 -DDE in the cereal and vegetable fields probably resulted from the longer cultivation history of these fields with lower soil salinity.…”

Biodegradation of DDE and DDT by Bacterial Strain Stenotrophomonas sp. DXZ9

“…DDT was classified in the precedent-controlled product directory as a compound with high pollutant and high environmental risk in China. DDT is an environmental endocrine disruptor and its residue and associated risk are still an issue of great contention due to its toxicity, persistence and bioaccumulation [2]. Dichloro-2,2-bis(4-chlorophenyl) ethylene (DDE), which is one of the toxic and primary metabolites of 1,1,1-trichloro-2,2-bis(4-chlorophenyl) ethane DDT [3,4], is stable, easily bioaccumulated [5] and difficult to biologically degrade in nature.…”