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Int. J. Environ. Res. Public Health 2016, 13(11), 1091; doi:10.3390/ijerph13111091

Arsenic and Heavy Metal Contamination in Soils under Different Land Use in an Estuary in Northern Vietnam

1
Graduate School of Integrated Science for Global Society, Kyushu University, Fukuoka 819-0395, Japan
2
Institute of Tropical Agriculture, Kyushu University, Fukuoka 812-8581, Japan
3
Soil Science Laboratory, Faculty of Land Management, Vietnam National University of Agriculture, Hanoi 100-000, Vietnam
*
Author to whom correspondence should be addressed.
Academic Editor: Susanne Charlesworth
Received: 25 August 2016 / Revised: 30 October 2016 / Accepted: 1 November 2016 / Published: 5 November 2016
(This article belongs to the Special Issue Heavy Metals: Environmental and Human Health)
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Abstract

Heavy metal contamination of soil and sediment in estuaries warrants study because a healthy estuarine environment, including healthy soil, is important in order to achieve ecological balance and good aquaculture production. The Ba Lat estuary of the Red River is the largest estuary in northern Vietnam and is employed in various land uses. However, the heavy metal contamination of its soil has not yet been reported. The following research was conducted to clarify contamination levels, supply sources, and the effect of land use on heavy metal concentrations in the estuary. Soil samples were collected from the top soil layer of the estuary, and their arsenic (As), chromium (Cr), cadmium (Cd), copper (Cu), lead (Pb), and zinc (Zn) concentrations were analyzed, as were other soil properties. Most soils in the estuary were loam, silt loam, or sandy loam. The pH was neutral, and the cation exchange capacity ranged from 3.8 to 20 cmol·kg−1. Manganese and iron concentrations averaged 811 µg·g−1 and 1.79%, respectively. The magnitude of the soil heavy metal concentrations decreased in the order of Zn > Pb > Cr > Cu > As > Cd. The concentrations were higher in the riverbed and mangrove forest than in other land-use areas. Except for As, the mean heavy metal concentrations were lower than the permissible levels for agricultural soils in Vietnam. The principal component analyses suggested that soil As, Pb, Zn, Cd, and Cu were of anthropogenic origin, whereas Cr was of non-anthropogenic origin. The spatial distribution of concentration with land use indicated that mangrove forests play an important role in preventing the spread of heavy metals to other land uses and in maintaining the estuarine environment. View Full-Text
Keywords: heavy metals; estuary; soil contamination; spatial distribution; Red River Delta heavy metals; estuary; soil contamination; spatial distribution; Red River Delta
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Nguyen Van, T.; Ozaki, A.; Nguyen Tho, H.; Nguyen Duc, A.; Tran Thi, Y.; Kurosawa, K. Arsenic and Heavy Metal Contamination in Soils under Different Land Use in an Estuary in Northern Vietnam. Int. J. Environ. Res. Public Health 2016, 13, 1091.

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