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引用本文:江江,李玉成,王宁,张学胜.巢湖蓝藻聚集对重金属迁移释放的影响.湖泊科学,2017,29(3):558-566. DOI:10.18307/2017.0304
JIANG Jiang,LI Yucheng,WANG Ning,ZHANG Xuesheng.Effect of cyanobacteria aggregation on the migration and release of heavy metals in Lake Chaohu. J. Lake Sci.2017,29(3):558-566. DOI:10.18307/2017.0304
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巢湖蓝藻聚集对重金属迁移释放的影响
江江, 李玉成, 王宁, 张学胜
安徽大学资源与环境工程学院 合肥 230601
摘要:
以巢湖蓝藻水华聚集地西半湖表层沉积物与蓝藻为对象,研究了表层沉积物重金属(Cd、Cr、Cu、Zn、Pb、Ni和Mn)总量的分布特征.同时,利用BCR连续提取法对沉积物中重金属Cd和Mn的形态进行分析,模拟探究蓝藻腐殖化过程中重金属含量的变化,探讨了蓝藻腐殖化对重金属吸附-释放的影响.结果表明,各采样点表层沉积物重金属含量均不同程度超出背景值,且距离南淝河越近越突出.潜在迁移指数表明整个西半湖沉积物中重金属Cd比Mn更易形成二次污染.相关性分析显示重金属Cd和Mn各形态含量和总量之间均表现出极显著正相关.巢湖西半湖属于典型的藻型湖,Cd和Mn的来源和分布均与蓝藻聚集密切相关,结合实验室模拟蓝藻腐殖化过程对重金属的吸附-释放规律,认为蓝藻腐殖化过程会对Cd和Mn的迁移释放产生影响.
关键词:  巢湖  重金属  蓝藻  腐殖化  吸附释放
DOI:10.18307/2017.0304
分类号:
基金项目:国家自然科学基金项目(41172121,21607001);安徽省自然科学基金青年项目(1608085QB45);安徽省高等学校自然科学重点项目(KJ2015090)
Effect of cyanobacteria aggregation on the migration and release of heavy metals in Lake Chaohu
JIANG Jiang, LI Yucheng, WANG Ning, ZHANG Xuesheng
School of Resources and Environmental Engineering, Anhui University, Hefei 230601, P.R.China
Abstract:
Samples of sediment and cyanobacteria were collected at a cyanobacteria gathering area of western-half area of Lake Chaohu. The distribution patterns of seven heavy metals (Cd, Cr, Cu, Zn, Pb, Ni and Mn) were studied, and the fractions of Cd and Mn were analyzed using the European Communities Bereau of Reference (BCR) sequential extraction procedure. In addition, laboratorial experiments were carried out to simulate the variations in the heavy metal contents during the cyanobacteria humification, and the effect of cyanobacteria humification on the adsorption and desorption of heavy metals were discussed. The results showed that the heavy metal contents of surface sediments exceed the background values, presenting different values of each sampling site. The closer near the Nanfei River, the higher pollution degree was. Potential Mobile Index analysis showed that, compared to Mn, Cd was more likely to cause the secondary pollution in the western-half area of Lake Chaohu. Correlations analysis indicated that both two heavy metals (Cd and Mn) showed a significant positive correlation between metal speciation and total metal value. Lake Chaohu was considered as a typical algae lake, and the sources and distributions of two heavy metals (Cd and Mn) were related to the algae boom. Combined with the study of adsorption and release by cyanobacteria humification, the present study speculates that the cyanobacteria humification could influence the migration and release of Cd and Mn in Lake Chaohu.
Key words:  Lake Chaohu  heavy metal  cyanobacteria  humification  adsorption and release
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