The source of DDT and its metabolites contamination in Turkish agricultural soils

摘要

The concentration and impact of 1,1,1-tri-chloro-2,2-bis(4-chlorophenyl)-ethane (DDT) and its metabolites (DDE: l,l-dichloro-2,2-bis(4-chloro-phenyl)ethylene) on the environment was expected to decrease after its ban in the mid-1980s. Unfortunately, DDT contamination via its presence as an impurity in dicofol (2,2,2-trichloro-l, l-bis(4-chlorophenyl)ethanol) has led to a new source of contamination. This is particularly true especially in cotton production in Soke Plain, Turkey, where difocol-based pesticides are being used. The aim of this research was to investigate the extent and source of DDT contamination in cotton soils. Soke Plain soil samples were collected from 0-30,30-60, and 60-90-cm depth and analyzed by GC/MS/MS. o, p'-DDT and p, p'-DDE were detected at 16.2 % and 17.6 % of the sites in the 0-30-cm depth of soils. In the 30-60 cm,p, p'-DDT'(14.9 %), o, p'-DDE (8.1 %) and/?, p'-DDE (2.7 %) were found in soil samples, and p, p'-DDT was the most prevalent with 9.5 % of the sampling sites. The dominant source of DDT particularly in the 60-90-cm depth was due to historic use of DDT. The presence ofp, p'-DDE, o, p'-DDE andp,p'-DDT in the topsoil was attributed to recent dicofol applications.