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Contamination characteristics of heavy metals in a small-scale tanning area of southern China and their source analysis
Environmental Geochemistry and Health ( IF 4.2 ) Pub Date : 2020-10-04 , DOI: 10.1007/s10653-020-00732-x
Chaolan Zhang 1 , Xianquan Cai 1 , Zhilin Xia 2, 3 , Xiaodan Jin 4 , Hao Wu 4
Affiliation  

Tanning industry has been identified as a significant source of heavy metals; however, heavy metals contamination in farmland soil due to small-scale tanning activities remains unstudied. Here, samples from topsoil, profile soil, water and sediments in the vicinity of a small-scale tanning area in Nanning, Guangxi Zhuang Autonomous Region, southern China, were collected to explore the contamination characteristics and source apportionment of Cd, Cr, Hg, As, Cu, Pb, Ni and Zn. The results show that the farmland soil was mainly contaminated by Cr and its content was 33.40–3830.00 mg kg−1. The highest level of Cr, Cd and Hg was above their thresholds, while the average contents of Cd, Cr, Pb and Hg exceeded the corresponding background levels. Moreover, enrichment of Cr in soil profiles and stream sediments were also observed, whose concentrations varied from 11.50 to 2590.00 mg kg−1 and 738.00 to 11,200.00 mg kg−1, respectively. Concentrations of Cr in top soils and soil profiles from farmland surrounding the stream were significantly higher than those from other areas, and the soils surrounding the stream were moderately to heavily polluted. The multivariate statistical analysis indicated that the heavy metals originated from traffic (Cu, Ni, Zn, Hg, and Pb), agriculture (Cr and Cd) and nature (As). Source apportionment with PMF model results showed that the relative contribution rates of heavy metals by traffic, tanning, agriculture, other industrial activities and natural sources were 16.00%, 18.88%, 20.88%, 22.04% and 22.20%, respectively. These findings indicate that small-scale tanning activities could also lead to heavy metal accumulation in the surrounding environment, which requires decision-makers to pay more attention and to develop effective remediation procedures.



中文翻译:

南方小规模制革区重金属污染特征及来源分析

制革业已被确定为重金属的重要来源;然而,小规模制革活动造成的农田土壤重金属污染仍未得到研究。本研究对广西壮族自治区南宁市某小型晒黑区附近的表土、剖面土、水体和沉积物进行了采样,探讨了Cd、Cr、Hg、砷、铜、铅、镍和锌。结果表明,农田土壤主要受到Cr污染,其含量为33.40~3830.00 mg kg -1。Cr、Cd、Hg的最高含量均高于阈值,而Cd、Cr、Pb、Hg的平均含量则超出相应的背景水平。此外,还观察到土壤剖面和河流沉积物中Cr的富集,其浓度范围分别为11.50至2590.00 mg kg -1和738.00至11,200.00 mg kg -1。溪流周边农田表层土壤和土壤剖面Cr浓度显着高于其他地区,溪流周边土壤处于中度至重度污染。多元统计分析表明,重金属来源于交通(铜、镍、锌、汞、铅)、农业(铬、镉)和自然(砷)。PMF模型源解析结果显示,交通、制革、农业、其他工业活动和自然资源对重金属的相对贡献率分别为16.00%、18.88%、20.88%、22.04%和22.20%。这些发现表明,小规模制革活动也可能导致周围环境重金属积累,这需要决策者更加关注并制定有效的修复程序。

更新日期:2020-10-05
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