Assessment of metals contamination of soils in Ulaanbaatar, Mongolia

The purpose of this survey is to investigate the current status of metal pollution of the soil in Ulaanbaatar, the capital city of Mongolia. During the last decade, the city has been rapidly urbanized. Twenty-two soil samples were collected from different parts of the city and analyzed by aqua regia...

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Bibliographic Details
Published in:Journal of hazardous materials 2010-12, Vol.184 (1-3), p.872-876
Main Authors: Batjargal, Tserennyam, Otgonjargal, Enktur, Baek, Kitae, Yang, Jung-Seok
Format: Article
Language:English
Subjects:
Applied sciences
Assessments
Chemical engineering
Coal
Combustion
Crystallization, leaching, miscellaneous separations
Decontamination. Miscellaneous
Exact sciences and technology
Extraction
Heavy metals
Leaching
Metals, Heavy - analysis
Mongolia
Pollution
Pollution abatement
Sequential extraction
Soil and sediments pollution
Soil Pollutants - analysis
Soil pollution
Soils
Ulaanbaatar
Urbanization
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Summary:The purpose of this survey is to investigate the current status of metal pollution of the soil in Ulaanbaatar, the capital city of Mongolia. During the last decade, the city has been rapidly urbanized. Twenty-two soil samples were collected from different parts of the city and analyzed by aqua regia extraction. Generally, metal pollution was not a serious problem in the city and there was no significant evidence of infiltration of metal solutions into subsoil (at a depth of 30cm). However, it was recently found that the arsenic(As) concentration in the soil was higher than the guideline value and the lead(Pb) content in some samples was higher than normal. The source of As pollution appears to be the coal combustion in three power plants in the city. The sources of the increase in Pb pollution might be the remarkable increase in the number of used vehicles and the increase in the use of leaded fuel in the last few years. To evaluate the leaching potential of heavy metals, sequential extraction was conducted. The quantity of the easily extractable fraction of metals was lower than that of the hardly extractable (residual) fraction. As a result, the leaching potential of heavy metals in Ulaanbaatar was found to be quite low.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2010.08.106