Phthalate esters and organochlorine pesticides in agricultural soils and vegetables from fast-growing regions: a case study from eastern China.

Abstract

The present study investigated phthalate esters (PAEs) and organochlorine pesticides (OCPs) in agricultural soils and vegetables from eastern China. The concentrations of PAEs ranged from 109 to 5560ng/g in soils and 60.1 to 2390ng/g in cabbages, with average concentrations of 946 and 601ng/g, respectively. The concentrations of OCPs ranged from <0.1 to 662ng/g in soils and <0.1 to 42.8ng/g in cabbages, with average concentrations of 134 and 11.6ng/g, respectively. OCPs were mainly in the 0-30cm surface soil layers, while PAEs could infiltrate in deep soil profiles to 70-80cm layer. Potential source analysis traced the occurrence of OCPs to both historical application and current usage, whereas building materials and agricultural plastic film were possible input sources of PAEs in the ambient environment. OCPs showed no apparent effect on soil microbial communities, whereas significant negative relationship was observed between PAEs and fungi in soils (R=-0.54, p<0.01). Human health risk assessment data revealed marginal noncarcinogenic risks and low carcinogenic risks in these soils. Notably, PAEs posed a comparable or higher risk level compared with that of OCPs. This study suggests the need for better regulation on pollution control and management of PAE-elevated sites to protect soil quality and food safety.