YIC-IR  > 中科院海岸带环境过程与生态修复重点实验室
Alternative TitleArsenic in River Sediments in Gold Mining Areas: Chemical Speciation and Release Kinetics
米玉婷; 蔡永兵; 于靖; 张华; 张晓龙
Source Publication环境科学与技术
Contribution Rank烟台大学环境与材料工程学院;中国科学院海岸带环境过程与生态修复重点实验室(烟台海岸带研究所);
Abstract金矿的开采和冶炼过程会对矿区河流产生严重的重金属污染。对采集的山东省招远界河受酸性矿山废水污染河道的表层沉积样品,采用BCR连续提取法分析了砷的赋存形态;采用搅拌式直流反应器(stirred-flow reactor)进行模拟淋洗实验,研究了沉积物中砷的动力学释放过程。结果表明:沉积物存在严重的砷污染,总砷的含量在778~3 389 mg/kg之间。其中弱酸可提取态、可还原态、可氧化态和残渣态含量分别占2.6%~9.8%,18%~79%,2.4%~7.1%,8.7%~75%,赋存形态分布主要受铁锰氧化物含量、有机质含量和p H等地球化学性质控制。在0.01 mol/L的Ca(NO_3)_2溶液...
Other AbstractGold mining and smelting in Zhaoyuan of Shandong Province usually discharged acid mine effluents,causing serious heavy metal pollution of Jiehe River’s water and sediments. In this study,top layer sediments were sampled and chemical speciation of arsenic (As)in sediments was analyzed by BCR sequential extraction. Kinetics of As release was studied as well by use of a simulated leaching process conducted with a stirred -flow reactor. The study found that the sediments had been contaminated seriously by arsenic with total content ranging between 778 mg/kg and 3 389 mg/kg. According to the chemical speciation,various states of arsenic in sediments such as weak acid extractable,reducible, oxidizable and residual accounted for 2.6%~9.8%,18%~79%,2.4%~7.1% and 8.7%~75%,respectively;the speciation was mainly controlled by geochemical factors such as iron and manganese oxide content,organic matter content and pH value. Furthermore,the sediment samples being rinsed with solution of Ca(NO3 )2 (in 0.01 mol/L)for 420 min the amounts of As released were measured,and the peak concentrations of As in the leachants ranged from 29.7 μg/L to 468 μg/L,which correlated with the total content of As in sediments. Arsenic concentration in leachates decreased with the extension of rinsing time,particularly in the initial 200 min,but interruptions of rinsing respectively at 90 min and 270 min could result in significant increases of leachates’As concentrations. Therefore,the facts revealed that As -release from contaminated sediments was kinetic in nature,and the release rate was dependent on the surface properties of sediments,as well as chemical speciation of As in sediments.
Keyword沉积物 赋存形态 释放动力学 金矿
DOI10.3969 / j.issn.1003-6504.2016.03.002
Funding Organization国家自然科学基金(41271506)
Indexed ByCSCD
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Document Type期刊论文
Corresponding Author张晓龙
Recommended Citation
GB/T 7714
米玉婷,蔡永兵,于靖,等. 金矿区河流沉积物中砷形态及释放动力学[J]. 环境科学与技术,2016,39(3):6-11.
APA 米玉婷,蔡永兵,于靖,张华,&张晓龙.(2016).金矿区河流沉积物中砷形态及释放动力学.环境科学与技术,39(3),6-11.
MLA 米玉婷,et al."金矿区河流沉积物中砷形态及释放动力学".环境科学与技术 39.3(2016):6-11.
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