Current contamination of persistent organochlorines in thivai river sediments, southern Vietnam

Abstract

This report presents the development an highly sensitive, stable and reliable OCs analyzing method with GC/MS(gas chromatography/mass spectrometry)and results of OCs(organochlorines) levels in sediments of Thi Vai River basin. The method recovery ranges from 72% to 129% and meets the requirement for OCs analyzing. 18 composite sediment samples were taken from 18 sites along Thi Vai river basin from upstream (Formosa Plant sewer mouth –Lo Ren canal) to downstream (confluence of Thi Vai and Go Gia rivers). The analytical results show that OCs concentration in Thi Vai river sediment (max 1.73 ng/gdry weight) is not higher than those of the reference sites and other river basins in Vietnam and in the world.