Heavy Metals Concentrations in Soil at the Closed Landfill in An Giang Province, Vietnam

Abstract

The study was carried out to evaluate the quality of soil at the finished
landfill located in Cai Dau town, Chau Phu district, An Giang
province, Vietnam. Twelve soil samples were collected including 6
samples in the surface layer (0-20 cm) (namely S1-S6), 6 samples in
the subsurface layer (60 - 80 cm) (namely S1-S6) for the analysis of
heavy metals such as Fe, Mn, Cu, Pb, Ni, Cr, Zn. The analytical
results showed that all the heavy metals occurred in soil in which Fe
was the highest and Ni was the lowest. The concentrations of the
heavy metals in the soil surrounding the closed landfill in both layers
were in the descending order of Fe> Mn> Zn> Cr> Cu> Pb> Ni.
These heavy metals concentrations were within the allowable range of
QCVN 03: MT/BTNMT- agricultural land. The occurrence of heavy
metals in different layers at the surrounding landfill could potentially
result in negative impact on the environments since heavy metals have
the capability of accumulation. Therefore, monitoring of the
environments around closed landfill should be implemented and the
long-term risk of heavy metals should be estimated.