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- Title
Pollution characteristics and source analysis of soil heavy metals at county scale based on high density sampling: a case study of Changle county, Shandong province.
- Authors
JIANG Bing; ZHANG Deming; LIU Yang; MA Jian
- Abstract
To study the pollution characteristics and sources of soil heavy metals in regional large-scale. The Changle County of Shandong Province was taken as the research area. The contents of 11 heavy metal elements, including Cu, Pb, Zn, Ni, Cr, V, Mn, As, Co, Cd, and Hg, were obtained from 5818 surface soil samples through grid sampling and analysis testing. The potential ecological risk was evaluated. The sources were analyzed qualitatively and quantitatively using methods such as difference analysis, principal component analysis, absolute principal component score-multiple linear regression analysis, and geostatistical analysis. The results showed that the study area belongs to the high background area of soil heavy metals content, but the overall pollution risk was low. The pollution degree of potential ecological risk was mainly moderate, with Hg and Cd making the highest contribution to the comprehensive potential ecological hazard, with contribution rates of 47. 94% and 28. 28% respectively. The analytical results showed that Co, Ni, Cr, V, Mn, and Cu were mainly derived from the natural sources of soil parent rock weathering controlled by the basic rock mass. Pb and Zn were mainly derived from comprehensive sources of traffic and mine-induced anomalies. As and Cd mainly come from natural sources influenced by carbonate rocks and sand shale parent rocks. Hg was mainly derived from anthropogenic sources affected by human activities. More than 30% of Pb, V, and Cd contributions were derived from unknown sources. The average contribution rates of the above pollution sources and unknown sources were 45. 18%, 16. 19%, 13. 78%, 5. 95%, and 18. 90%,respectively. Natural sources were the main sources of soil heavy metals in the study area, and comprehensive and anthropogenic sources contributed the most to Pb, Zn, and Hg, which may cause superimposed pollution. Through the analysis and research in this article, areas with high pollution risks can be further screened, and heavy metal sources can be identified on a small scale, especially unknown sources, providing a basis for soil heavy metals pollution prevention and control.
- Subjects
SHANDONG Sheng (China); HEAVY metals; ANALYSIS of heavy metals; METAL content of soils; HEAVY metal toxicology; POLLUTION; HEAVY elements
- Publication
Nonferrous Metals (Mining Section), 2024, Vol 76, Issue 3, p157
- ISSN
1671-4172
- Publication type
Article
- DOI
10.3969/j.issn.1671-4172.2024.03.021