Organochlorine Pesticides in the Soil in Linfen, China

Abstract

Eighteen organochlorine pesticides (OCPs) in air particulate matter (PM) samples collected from 20 sites in Beijing, China in 2005 and 2006 were analyzed to determine the composition, spatial distribution and sources. Total OCPs of PM 2.5 and PM 10 ranged from 32.59 pg m −3 to 9232.31 pg m −3 and 80.96 pg m −3 to 9434.97 pg m −3 , respectively, categorized as heavier pollution compared to other cities of China. Among six kinds of functional zones involved, commercial areas and industrial centers were heavily polluted. Distinct concentrations variations were detected in PM with different particle diameters. Pollution distribution was spatially heterogeneous inside the city. The most heavily polluted sites located in the southeast part of the city, where laid many chemical factories. Compositional analysis and principal component analysis (PCA) suggested that past usage of OCPs was the main source, though there were new inputs in some sites.

Incidence of organochlorine pesticides in soils of Shenzhen, China

“…22 A ratio ratio < 1 indicates relatively recent exposure to the parent DDT. 14 In the present study, the ratios of (p,p 0 -DDE + p,p 0 -DDD)/p,p 0 -DDT were <1 in all samples, indicating that the contamination occurred in recent years. Given the above discussion, it can be concluded that new input sources of DDTs may be present in this region, and dicofol and anti-fouling paint were identified as probable culprits.…”

“…DDT and HCH concentrations in soil in Shenzhen were slightly higher than or comparable with those in agricultural soils of other locations in China. [12][13][14] However, the detection rates of DDTs were below 10% (Table S1 †), which indicated accidental occurrence of these compounds in Shenzhen. That the current DDT pollution in the soil of Shenzhen was not severe may be due to the agricultural land decreasing sharply with the urbanization over the past 30 years.…”

Exposure Assessment of Organochlorine Pesticides, Arsenic, and Lead in Children From the Major Agricultural Areas in Sonora, Mexico

“…The ratio of ( p,p ′-DDE + p, p ′-DDD/ p,p ′-DDT) is often used as an index for assessing the residence time of p,p ′-DDT in the environmental. A value >1.0 indicates that the application was performed in the past, and a value <1.0 indicates a relatively recent application (Cheng et al 2008). In this study, this ratio p,p ′-DDE/ p,p -DDT was 3.3 > 1.0, which is an indication of past exposure to DDT.…”