School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China.
Zhenjiang Agricultural Products Quality Inspection and Testing Center, Zhenjiang, 212003, China.
Environ Sci Pollut Res Int. 2021 Apr;28(15):19367-19380. doi: 10.1007/s11356-020-12112-0. Epub 2021 Jan 4.
Thirty samples of sediments were taken from Bosumtwi Lake (also called Bosomtwe Lake) in Ghana and analyzed for the contents of Fe, As, Hg, Co, Cr, Ni, Cd, and Pb. Several pollution indices (enrichment factor (EF), contamination factor (CF), geoaccumulation (I), and pollution load index (PLI)) were used to determine sedimentary pollution levels, and the risk of environmental exposure was calculated using Hakanson's potential ecological risk (PER) indices. The results from PER assessments have indicated that sediments from the Bosumtwi Lake present a moderate environmental risk. According to EF calculations, Hg in Bosumtwi lake sediments is the element of concern that is being severely enriched. Hg was the largest contributor to PER with a 97% risk contribution. Multivariate statistical analysis revealed that the main sources of Hg were agrochemicals and atmospheric deposition, whereas the sources of Fe, As, Co, Cr, and Ni to Bosumtwi Lake were natural processes and are derived from the local lithology. There was no strong significant correlation among the contents of the heavy metals, sediment grain sizes, and total organic carbon (TOC), suggesting their lack of control in the distribution of heavy metals, the source, and the transport pathway. Finally, it is strongly recommended to do a study on Hg bioavailability in Bosumtwi Lake sediments. These findings will be relevant to Bosumtwi Lake's profiling and historical development of heavy metal loads.
从加纳的博苏姆推湖（也称为博姆特威湖）采集了 30 个沉积物样本，并分析了其中的铁、砷、汞、钴、铬、镍、镉和铅含量。使用了几种污染指数（富集因子 (EF)、污染因子 (CF)、地质累积指数 (I) 和污染负荷指数 (PLI)) 来确定沉积物的污染水平，并使用 Hakanson 的潜在生态风险 (PER) 指数来计算环境暴露的风险。PER 评估的结果表明，博苏姆推湖的沉积物存在中度环境风险。根据 EF 计算，博苏姆推湖沉积物中的汞是受到严重富集的关注元素。汞是 PER 的最大贡献者，占 97%的风险贡献。多元统计分析表明，汞的主要来源是农用化学品和大气沉降，而铁、砷、钴、铬和镍在博苏姆推湖的来源是自然过程，来自当地的岩石学。重金属含量、沉积物粒径和总有机碳 (TOC) 之间没有强烈的显著相关性，这表明它们在重金属的分布、来源和运输途径中缺乏控制。最后，强烈建议对博苏姆推湖沉积物中的汞生物可利用性进行研究。这些发现将与博苏姆推湖重金属负荷的特征分析和历史发展有关。
