Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China.
Int J Environ Res Public Health. 2019 Oct 26;16(21):4131. doi: 10.3390/ijerph16214131.
To determine the geochemical characteristics and contamination of soil mercury in the Mun River basin, northeast Thailand, the vertical mercury distribution patterns and mercury contamination levels in six soil profiles under different land uses are studied. A total of 240 soil samples collected from agricultural land, abandoned agricultural land, and woodland were analyzed by an RA-915M mercury analyzer to determine the total mercury (THg) content, which ranged from 0.13 to 69.40 μg∙kg in the study area. In the soil cultivation layer (0-30 cm), the average content of THg in the woodland (15.89 μg∙kg) and the agricultural land (13.48 μg∙kg) were higher than that in the abandoned agricultural land (4.08 μg∙kg), indicating that the plants or crops could increase the content of mercury in the surface soil layer. The total organic carbon (TOC) and iron content with high positive correlations with the THg content significantly contributed to the adsorption of soil mercury. Moreover, a higher pH value in the soil and a finer grain size in soil texture can be beneficial for the enrichment of mercury. A geoaccumulation index was used to evaluate the contamination of mercury, showing that this area had a slight contamination, and a few soil sites were moderate contamination.
为了确定泰国东北部忙河流域土壤汞的地球化学特征和污染状况，研究了不同土地利用方式下 6 个土壤剖面的垂直汞分布模式和汞污染水平。共采集了 240 个农业用地、废弃农业用地和林地土壤样品，采用 RA-915M 汞分析仪分析总汞（THg）含量，研究区范围为 0.13-69.40μg∙kg。在土壤耕作层（0-30cm）中，林地（15.89μg∙kg）和农业用地（13.48μg∙kg）的 THg 平均含量高于废弃农业用地（4.08μg∙kg），表明植物或作物可能会增加表层土壤中汞的含量。总有机碳（TOC）和铁含量与 THg 含量呈高度正相关，这对土壤汞的吸附有很大贡献。此外，土壤中较高的 pH 值和较细的土壤质地颗粒大小有利于汞的富集。采用地质累积指数评价汞的污染状况，表明该地区有轻微污染，少数土壤点位有中度污染。
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