贵州铜仁松桃典型锰矿区锰矸石重(类)金属赋存状态及生态风险分析  

Occurrence and Ecological Risk Assessment of Heavy Metals(Metalloids)in Manganese Gangue in Songtao Typical Manganese Ore Area of Tongren,Guizhou

作　　者：徐进鸿 刘亚峰 杨周[1,2] 赵海 徐海 龙胜桥 Xu Jinhong;Liu Yafeng;Yang Zhou;Zhao Hai;Xu Hai;Long Shengqiao(Institute of Resources and Environment,Tongren University,Tongren Guizhou 554300,China;Institute of Fanjingshan National Park,Tongren University,Tongren Guizhou 554300,China)

机构地区：[1]铜仁学院资源与环境研究所,贵州铜仁554300 [2]铜仁学院梵净山国家公园研究院,贵州铜仁554300

出　　处：《地球与环境》2024年第6期705-712,共8页Earth and Environment

基　　金：铜仁市科技计划项目(铜市科研(2022)64号、铜市科研(2022)60号);铜仁学院博士科研启动基金项目(trxyDH2106)。

摘　　要：该研究旨在探讨铜仁松桃典型锰矿区的锰矸石中重(类)金属的分布特征和潜在生态风险。通过对锰矸石中重(类)金属(Mn、Pb、As、Cr、Ni、Cu、Zn和Cd)的总量和赋存形态进行分析,并采用风险评估指数和次生相原生相分布比值法对其环境效应进行评价,揭示重(类)金属潜在的污染风险。结果显示:锰矸石中Mn和As的含量分别为3820~138500 mg/kg和21.3~72.8 mg/kg,分别当地土壤地球化学背景值的7.96~243.80和1.20~4.11倍,其余重(类)金属含量则低于或与当地土壤背景相似;BCR分析结果显示Mn的弱酸提取态和次生相占比较高,分别为7.84%~39.53%和92.34%~98.83%;风险评估指数和次生相原生相分布比值法表明Mn是主要的环境生态风险因子,存在重度污染风险,大部分样品中Cd、Ni、Cu、Pb和Zn则存在中-低度污染风险。In order to reveal the distribution characteristics and potential ecological risks of heavy metals(metalloids)in manganese gangue,this paper took manganese gangue from Songtao typical manganese ore areas in Tongren City as the research object,and analyzed the total amount and occurrence form of heavy metals(metalloids)of Mn,Pb,As,Cr,Ni,Cu,Zn and Cd,and discussed the potential pollution risk of heavy metals based on risk assessment coding(RAC)and ratio of secondary phase to primary phase(RSP).The contents of Mn and As in gangue were 3820-138500 mg/kg and 21.3-72.8 mg/kg,respectively;which were 7.96-243.80 and 1.20-4.11 times higher of the soil geochemical background values of Tongren,respectively.And the content of other heavy metals(metalloids)was lower than or similar to that of their background value.BCR analysis showed that the proportion of weak acid extracted fraction and available fraction of Mn were 7.84%-39.53%and 92.34%-98.83%,respectively,which were the highest in mangangue gangue.RAC and RSP showed that Mn was the main environmental and ecological risk influencing factor,and had the highest risk level;Cd,Ni,Cu,Pb and Zn were at medium to low contamination risk level in most samples.

关 键 词：重(类)金属 赋存状态 锰矸石 铜仁 

分 类 号：X142[环境科学与工程—环境科学]