Tracing aquatic pesticide pollution to its sources

Viet, P.H.; Hung, T.L.; Hung, N.V.; Chieu, L.V.; Minh, N.H.

ACIAR Proceedings Series 85: 184-190

1998


Accession: 003321331

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Abstract
Since 1995 the Chemical and Environmental Engineering Department (CEED) of Vietnam National University (VNU) has been conducting a research program to evaluate levels of pesticide residues and their distribution in the environment. This research has been focused initially on Red River Delta and in neighbouring areas along the river banks. Many series of samples, including rice, water, sediment, and organisms, were collected over each year. The samples were prepared by extraction, clean-up, and enrichment procedures appropriate to each type. Finally, solutions of the prepared samples were quantified by GC/ECD and GC/MS. The results of these studies showed that concentrations of organochlorine pesticide residues in water and rice in this region were still below maximum allowable limits. However, the concentrations varied widely depending on the weather, and were especially low in the wet season. This may be the result of dilution of pesticides in the water. Organochlorine pesticide residue concentrations in sediment samples collected from near the mouth of the Red River Delta were higher than those in samples collected further off-shore.