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 Thivai 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 Thivai 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/g dry weight) is not higher than those of the reference sites and other river basins in Vietnam and in the world.