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| Distribution and Migration Characteristics and Influencing Factors of Heavy Metals in Unsaturated Zone of Metallurgical Enterprise Site |
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Received:June 19, 2023
Revised:July 06, 2023
Accepted:July 07, 2023
Published Online:October 09, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.11.011 |
| KeyWord:soil；unsaturated zone；heavy metals；transport characteristics |
| Author | Institution |
| DONG Zhifen |
云南绿色环境科技开发有限公司 |
| LIANG Ce |
云南省核工业二〇九地质大队;云南省核工业二〇九地质大队 |
| XIE Rongsheng |
云南新世纪环境保护科学研究院 |
| ZHONG Min |
云南绿色环境科技开发有限公司 |
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| Abstract: |
| Taking a metallurgical enterprise site in Northeast Yunnan as the research area, a total of 37 sampling site boreholes were laid out according to the distribution of pollution sources. In the 115 soil samples collected at different strata and depths, based on drilling information, formation modeling-drilling model in the research area, and according to the test results of heavy metal concentration analysis in soil samples, the spatial distribution of heavy metals in soil was analyzed. The concentration correlation between different heavy metal indicators was also obtained. Using the Kriging interpolation method, a heavy metal concentration distribution model for different depths of the soil in the study area was established. The migration characteristics and influencing factors of heavy metals were also analyzed. The results show that: 1) Affected by human production activities, the average concentration of five kinds of heavy metals far exceeds the background value; As and Co exceed the soil pollution risk control value of construction land, Cd, Ni and Pb exceed the screening value of the soil pollution risk of construction land, and the obvious pollution phenomenon appears. 2) The variation coefficient of Co, Ni, Cd, As, and Pb in surface soil gradually decreases, indicating that the uneven concentration distribution decreases successively; The variation coefficient gradually decreases with the increase of depth, indicating that exogenous factors such as artificial production activities lead to the uneven vertical distribution, and the exogenous influence degree of concentration gradually decreases with the increase of depth. 3) As, Co and Ni shows very significant correlation, showing obvious mutual aggregation phenomenon, extremely similar material source and exogenous influence; As-Cd, As-Pb, Co-Pb and Pb-Ni show high correlation, not obvious; The correlation between other pollutants is poor, and basically no aggregation phenomenon. 4) The vertical migration characteristics of heavy metals in the area of artificial filling layer are obvious, influenced by the barrier of quaternary clay layer, the horizontal migration and diffusion effect of the contaminated layer is not obvious. |
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