Evaluation of residual level and distribution characteristics of organochlorine pesticides in agricultural soils in South Korea

Distribution Characteristics and Influencing Factors of Organochlorine Pesticides in Agricultural Soil from Xiamen City

“…Among these compounds, δ-HCH was generally the most dominant, with concentrations ranging from n.d. to 0.78 ng/L, with a mean value of 0.223 ng/g at a 60% detection frequency of the soil samples. Compared with other regions, the pollution levels of HCHs in agricultural soils in Xiamen were lower than those in northern regions (34.0 ng/g) [20], central regions (15.39 ng/g) [21], Shanghai (2.41 ng/g) [22], Zhangzhou (9.79 ng/g) [23], Qinghai-Tibet Plateau (0.35 ng/g) [24], and other countries such as South Korea (0.2 ng/g) [25]; they were higher than in Kuwait (0.065 ng/g) [26] and Mexico (0.027 ng/g) [27]. Dichlorodiphenyltrichloroethane (DDT) is converted into Dichlorodiphenyldichlor oethane (DDD) and Dichlorodiphenylethane (DDE), respectively under anaerobic and aerobic conditions, and their derivatives include o, p -DDT, which is made from a racemic mixture of enantiomers (1:1) [28].…”

“…As the main product of DDT after dechlorination, DDD was found at a higher concentration than the parent and was detected at a higher frequency in soil samples. The pollutant level of DDTs is lower than that in the north (30.0 ng/g) [20] and central (151.56 ng/g) [21] areas, Shanghai (21.41 ng/g) [22], Zhangzhou (3.86 ng/g) [23], Qinghai Tibet Plateau (1.36 ng/g) [24], and other countries such as South Korea (23.18 ng/g; [25], Kuwait (1.22 ng/g) [26], and Mexico (1.6 ng/g) [27].…”