Assessment and Countermeasures for Mercury Contamination of Agricultural Soils near Waste Disposal Facility in Hanoi, Vietnam

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Inappropriate management of the land-filling area has been posing potential risks to the environment around Nam Son waste disposal facility in Hanoi. In this study, we focused on Hg contamination and evaluated the amounts of Hg in different chemical forms in the river sediments and upland soils, and Hg concentrations in the air and crops. In the sediments, the highest amount of total Hg was detected at the nearest site to the facility and decreased with the distance from the facility. Methyl Hg was also detected at these sites. Almost all of Hg in the sediments were extracted in the organically bound and residual fractions. No Hg contamination was observed for the upland soils, crops and air. From this study, it was confirmed that Hg contamination of the sediments was brought about by the point source pollution from the land-filling area, where the solid particles containing Hg have been eroded by flooding under heavy rains.