其他题名Study on the release and vertical migration characteristics of As and Sb in farmland soil contaminated by dam break of Huashan tailings pond,Anhui,China
蔡永兵1,2; 邵俐1; 范行军1,2; 李飞跃1,2; 孟凡德1,2; 张华3
发表期刊环境化学
ISSN0254-6108
2020
卷号39期号:9页码:2479-2489
关键词矿区农田土壤释放迁移
研究领域Environmental Sciences & Ecology
英文摘要Recent years,tailings pond dam leakage and break accidents arising from extreme weather happened frequently,causing serious pollution to the surrounding farmland by tailings with high content of heavy metals. This study was to investigate the release and transport behavior of arsenic and antimony after the tailings entered the soil,and assess its potential pollution risks furtherly. The contents of arsenic and antimony in the surface and profile soil of a small antimony gold mining area in Anhui province were analyzed. Column leaching experiments were also carried out using the contaminated soil. The farmland soil in the study area was seriously polluted by arsenic and antimony. The contents of arsenic and antimony in the surface soil of the contaminated farmland were (14111.4) mg·kg~(-1) and (1045.2) mg·kg~(-1),respectively,which were 12 and 85 times higher than their background value in Chinese soil,and also significantly higher than the control soil. The soil pollution reached the level of heavy pollution. Despite similar geochemical properties,the vertical migration of As and Sb showed different characteristics. Antimony in soil was mainly distributed in the surface layer,and its content decreased gradually with the increase of depth. In addition to high content in surface layer (113 mg·kg~(-1)),arsenic content showed a maximum value at the depth of 60 cm (114 mg·kg~(-1)). This indicated that arsenic and antimony in surface contaminated soils would gradually migrate downward,and the migration capacity of arsenic was higher than that of antimony. Under leaching conditions of different pH and phosphorus concentrations,the release intensity of arsenic was significantly greater than that of antimony. The maximum release concentrations of arsenic and antimony were 1151 mug·L~(-1) and 10 mug·L~(-1) under different pH conditions. The maximum release concentrations of arsenic and antimony were 1277 mug·L~(-1) and 170 mug·L~(-1),respectively,when leaching with different phosphorus solutions. The application of phosphate fertilizer could promote the release of arsenic and antimony in the soil contaminated by tailings,which increased a potential ecological risk.
中文摘要近年来,极端天气引发的尾矿库泄露和溃坝事故频发,导致周边农田极易遭受高重金属含量的尾矿砂污染.为进一步探讨富含重金属的尾矿砂进入土壤后砷(As) 、锑(Sb)的释放及迁移行为,评估其潜在的污染风险,本研究以安徽省某小型锑金矿区周边农田为例,分析了矿区表层和剖面土壤中砷和锑的含量,并利用污染农田土壤开展了柱淋溶实验.结果表明,研究区污染农田表层土壤中As和Sb的含量分别为(141 11.4) mg·kg~(-1)和(1045.2) mg·kg~(-1),分别超过中国土壤背景值12倍和85倍,也远高于对照田表层土壤,达到重度污染水平.尽管具有相似的地球化学性质,但As和Sb在土壤垂向迁移方面表现出不同的特性.土壤中的Sb主要分布于表层,其含量随剖面深度增加逐渐降低;而土壤As含量除表层较高外(113 mg·kg~(-1)),在60 cm深度出现一个极大值(114 mg·kg~(-1)).这表明表层污染土壤中的As和Sb会逐渐向下迁移,并且As的迁移能力高于Sb.在不同pH和不同浓度磷溶液淋滤下,As的释放强度均明显大于Sb,不同pH溶液淋滤条件下As的最大释放浓度达到1151 mug·L~(-1),Sb的最大释放浓度只有10 mug·L~(-1).不同浓度磷溶液淋滤条件下As和Sb的最大淋出浓度分别为1277 mug·L~(-1)和170 mug·L~(-1).磷肥的大量施加可以促进尾矿砂污染土壤中As、Sb的释放,增大其潜在生态风险.
文章类型Article
资助机构安徽省自然科学基金; 国家自然科学基金; 安徽省高校自然科学研究项目; 大学生创新创业训练计划项目
收录类别CSCD
语种中文
CSCD记录号CSCD:6824882
引用统计
文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/30330
专题中科院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
作者单位1.安徽科技学院资源与环境学院,凤阳233100;
2.生物炭与农田土壤污染防治安徽省重点实验室,蚌埠233400;
3.中国科学院烟台海岸带研究所,海岸带环境过程与生态修复重点实验室,烟台264000
推荐引用方式
GB/T 7714蔡永兵,邵俐,范行军,等. 安徽花山尾矿库溃坝污染农田土壤中As、Sb的释放及垂向迁移特征[J]. 环境化学,2020,39(9):2479-2489.
APA蔡永兵,邵俐,范行军,李飞跃,孟凡德,&张华.(2020).安徽花山尾矿库溃坝污染农田土壤中As、Sb的释放及垂向迁移特征.环境化学,39(9),2479-2489.
MLA蔡永兵,et al."安徽花山尾矿库溃坝污染农田土壤中As、Sb的释放及垂向迁移特征".环境化学 39.9(2020):2479-2489.
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