不同浸提工艺的金矿尾矿中砷的存在形态研究     

陈兆鑫  李达明  罗锡明 《岩矿测试》2014,33(3):363-368

金矿尾矿是砷污染的重要来源,不同冶炼工艺形成的尾矿中砷的赋存状态有很大差异,不同的砷形态会直接影响其在环境中的迁移转化行为,确认砷的存在形态是修复砷污染场地研究中的重要内容。本文针对浮选法和生物氧化法两种不同浸金方法的尾矿,采用pH计和氧化还原电位自动测定仪测量尾矿的物理性质(pH、氧化还原电位),采用X射线衍射和X射线荧光光谱分析尾矿的矿物物相和主要成分,电子探针分析砷的存在形态。表征结果表明,浮选法尾矿和生物氧化法尾矿的物理性质都会因堆置环境的变化而变化,其Eh、pH和零电荷点都大致相同,pH≈8.5,样品零电荷点(pHPZC)大约为8.5。由于两种尾矿都属于碱性环境,因此在修复方法的选择上也受到限制,如只适合在酸性条件下进行的电动修复法就不适用于这两种尾矿,修复试剂的选择也以碱性物质和铁的氧化物(氢氧化物)为主。浮选法尾矿的主要矿物类型为石英、白云石和黏土矿物,化学主要成分是Si和Al,尾矿呈灰白色,其中砷的含量约为754μg/g左右,主要以毒砂(FeAsS)形式存在;而生物氧化法尾矿的主要矿物类型为石膏,化学主要成分是Fe、Ca和S,尾矿呈红棕色,其中砷的含量约为26350μg/g,主要以毒砂(FeAsS)和五氧化二砷(As2O5)形式存在。两种浸金工艺每一道工序的不同,都会造成两种尾矿在矿物相、主要成分和其中砷存在形态上的差异。因此在进行尾矿原位修复工作时,应考虑不同浸金方法对尾矿堆置环境和砷存在形态的影响,从而选择出一种更加合适、廉价、高效的修复方法和试剂。  相似文献   

Arsenic distribution and hydrochemical factors in urban groundwater,Foshan City,South China     

Guanxing Huang  Zongyu Chen  Jichao Sun 《中国地球化学学报》2014,33(4):398-403

The distribution of arsenic （As） in shallow groundwater of eastern Chancheng District in Foshan City as a function of season and water table was investigated, and the influence of hydrochemical factors on the As distribution was discussed. The groundwater samples were collected from 20 sites in dry season and 9 sites in wet season. As concentrations in 20% groundwater samples exceeded value of the WHO guideline （10 μg/L）, and the highest As concentration of 23.5 μg/L occurred in dry season. It is observed that groundwater As concentration decreased with the increase of depth of water table in dry season, and were generally higher in wet season than that in dry season, indicating that ground surface As might be one of the main sources for shallow groundwater As in study area, especially in wet season. Groundwater As concentration in study area had significantly positive correlation with the concentration of Fe, Mn, NH4, F, and COD, and was positively correlated to pH, but negatively correlated to Eh and K, indicating that reductive dissolution of Fe and Mn （oxy）hydroxides might be one of the main control mechanisms for groundwater As mobilization, while pH and F also played an important role in controlling the groundwater As mobilization in study area.  相似文献   

线性回归法在地下水水质分析中的应用     

白高峰  张燕君  宣学丽  张银妹  石睿 《地下水》2014,(2):14-16

运用逐步线性回归的理论方法,分析研究区的地下水水质指标间的相关性,研究区属砷元素富集地区,对研究区建立砷含量与其他指标之间的线性回归模型,确定砷含量与HPO4-2、Fe、I-,Br-的含量相关性较显著。此模型可以用于研究区的地下水环境的规划、评价、研究工作中。  相似文献   

梵净山石柱岩铜砷矿床地质特征及控矿因素     

朱永红  韦胜永  朱成林 《贵州地质》2010,27(4):266-271

本文以贵州省印江县梵净山石柱岩铜砷矿床勘探地质成果资料①为依据,论述了矿床地质背景、矿床地质特征及控矿因素,并在此基础上阐明了成矿物质来源于该矿床附近的花岗岩。石柱岩铜砷矿的赋存与富集严格受花岗岩、辉绿岩、断层破碎带及硅化围岩蚀变的多重控制,含矿热液沿断层破碎带活化迁移,富集成矿。矿床成因类型为岩浆期后中温热液型铜砷矿床,其成矿时代归属武陵期。  相似文献   

中国主要地方病区地质环境研究进展与展望   总被引：4，自引：0，他引：4       下载免费PDF全文

张福存文冬光  郭建强张二勇郝爱兵  安永会 《中国地质》2010,37(3):551-562

地方性砷中毒、氟中毒和大骨节病是中国目前流行的主要地方病病种,严重威胁着群众的身体健康。本文总结了中国北方主要盆地高砷水、高氟水分布规律及形成机理和中国大骨节病区地质环境的特点及其相互关系研究的进展,并就其研究方向进行了展望。  相似文献   

Arsenic in the water–soil–plant system and the potential health risks in the coastal part of Chianan Plain,Southwestern Taiwan     

《Journal of Asian Earth Sciences》2013

The present study investigates the bioavailability, soil to plant transfer and health risks of arsenic (As) in the coastal part of Chianan Plain in southwestern Taiwan. Groundwater used for irrigation, surface soils from agricultural lands and locally grown foodstuffs were collected from eight locations and analyzed for As to assess the risks associated with consuming these items. The concentration of As in groundwater ranged from 13.8 to 881 μg/L, whereas surface soil showed total As content in the range of 7.92–12.7 mg/kg. The available As content in surface soil accounted for 0.06–6.71% of the total As content, and was significantly correlated with it (R² = 0.65, p < 0.05). Among the leachable fraction, the organic matter (3.23–54.8%) and exchangeable portions of oxides (6.03–38.4%) appear to be the major binding phases of As. The average As content in fourteen studied crops and vegetables varied from 10.3 to 151 μg/kg with maximum in mustard and minimum in radish. All the plants showed considerably higher As content (21.5 ± 3.64–262 ± 36.2 μg/kg) in their roots compared to the edible parts (9.15 ± 1.44–75.8 ± 22.9 μg/kg). The bioaccumulation factor (BAF) based on total As (ranging from 0.0009 to 0.144) and available As in soil (ranging from 0.039 to 0.571) indicate that mustard, rice, amaranth and spinach are the highest accumulators of As. Although the health risk index (HRI) of the studied crops and vegetables ranged from only 0.0068–0.454, with the maximum in rice, the combined HRI indicates an alarming value of 0.88. Therefore, the possible health risks due to long-term consumption of rice and other As-rich foodstuffs could be overcome by controlling the contamination pathways in the water–soil–plant system.  相似文献   

封闭酸溶-电感耦合等离子体原子发射光谱法同时测定地质样品中硼砷硫   总被引：15，自引：6，他引：15  

李冰马新荣  杨红霞何红蓼 《岩矿测试》2003,22(4):241-247

采用充氩电荷注入检测器(CID)-电感耦合等离子体原子发射光谱仪结合HF—HNO3-HClO4-H3PO4密封溶样法，建立了适用于多目标地质调查中土壤、水系沉积物等地质样品中B、As、S的同时测定方法。方法的特点是通过加入少量H3PO4避免了易挥发元素B的挥发损失；采用Se 196.0nm谱线为内标，对残留空气对超紫外区谱线测定中的强度漂移影响起到了很好的补偿作用；该方法还可同时测定Cu、Pb、Zn、Cr、Ni、Li、Mn和V等微量元素。B、As、S的仪器检出限(3SD，μg／mL)分别为0．01、0．008、0．03，方法检出限(10SD，DF=100，μg/g)分别为2．61、3．28、9，58。用国家标准物质土壤GBW 07401-07408，水系沉积物GBW 07309-07312验证了测定B、As、S的准确性及精密度，允许误差范围之内，测定值与标准值接近，样品10次测定的RSD为4．34％～25．0％。  相似文献   

Evaluation of Arsenic Speciation of Stream and Hot Spring Deposits through X-ray Absorption Spectroscopy and Sorption Experiment     

ZHANG Yinfeng  LI Shehong  WANG Hui  WANG Mingguo  ZHENG Baoshan  ZHENG Lirong  YANG Qiang  ZHENG Yan 《《地质学报》英文版》2013,87(Z1):665-666

  相似文献   

Provenance of High Arsenic Holocene Sediment and Low Arsenic Pleistocene Sediment in Bangladesh Aquifers: A Preliminary Assessment     

ZHENG Yan  YANG Qiang  Alan M. SELTZER  N. Gary HEMMING  Sidney R. HEMMING 《《地质学报》英文版》2013,87(Z1):667-668

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Enrichment of Arsenic in Rivers Originating from the Tibetan Plateau     

LI Shehong  WANG Mingguo  WANG Hui  ZHANG Yinfeng  ZHENG Baoshan  YANG Qiang  ZHENG Yan 《《地质学报》英文版》2013,87(Z1):638-639

  相似文献