title: Dicofol application resulted in high DDTs residue in cotton fields from northern Jiangsu province, China.
abstract: Dicofol with high impurity of DDT compounds is still widely used in agricultural practice such as cotton cultivation and becomes an important source of DDT pollution in China. In this study, investigations on the DDT residues in cotton fields from northern Jiangsu province, China were conducted. The results showed that DDTs in cotton soil were much higher than other mode of land use. The DDTs levels ranged from 4.2 to 678.6 ngg(-1), with a mean concentration of 190.4 ngg(-1), of which the most abundant compounds were p,p'-DDE (mean of 129.38 ngg(-1)), p,p'-DDT (mean of 26.57 ngg(-1)) and o,p'-DDT (mean of 16.92 ngg(-1)). The concentrations of o,p'-DDT and o,p'-DDE were significantly higher (p<0.05) in topsoil (0-10 cm) than in subsoil (10-20 cm), while other DDT compounds were not. Source apportionment showed that dicofol-type DDT accounted for up to 80% of the DDTs residue. All the results indicated that dicofol applications resulted in serious DDT pollution in cotton fields. Our work provided implications for reasons why there was no apparent decrease of DDT level in China.
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Xinglun
authors.initials: X
authors.lastname: Yang
authors.forename: Shisheng
authors.initials: S
authors.lastname: Wang
authors.forename: Yongrong
authors.initials: Y
authors.lastname: Bian
authors.forename: Feng
authors.initials: F
authors.lastname: Chen
authors.forename: Guifen
authors.initials: G
authors.lastname: Yu
authors.forename: Chenggang
authors.initials: C
authors.lastname: Gu
authors.forename: Xin
authors.initials: X
authors.lastname: Jiang
mesh_terms: D000383:Agriculture; D002681:China; D002845:Chromatography; D003634:DDT / Q000032:analysis*; D004010:Dicofol; D003368:Gossypium; D007306:Insecticides; D010573:Pesticide Residues / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014675:Vegetables
chemical_list: D007306:Insecticides; D010573:Pesticide Residues; D012989:Soil Pollutants; D003634:DDT; D004010:Dicofol