重庆巫山地区上二叠统黑色岩系中镉等有害元素赋存状态及环境意义
Occurrences of Toxic Elements in Upper Permian Black Shales at Wushan Area and Their Environmental Implication
查看参考文献33篇
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文摘
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本文以重庆巫山地区上二叠统黑色岩系为研究对象,通过全岩化学分析、矿物分析、连续化学提取、浸提实验等方法,揭示黑色岩系中有害微量元素的赋存状态及其环境意义。结果表明,研究区黑色岩系样品富含有机碳和硫,为典型缺氧条件下的产物;明显富集Cd、Cr等有害元素。Cd主要赋存于碳酸盐矿物中,Cr主要赋存于硅酸盐矿物,Zn和Ni的赋存载体包括硫化物、有机质等。不同样品中有害元素的赋存状态有所差异,且与矿物组分密切相关。母岩中有害元素赋存状态的差异可能控制其在土壤等环境介质中的活性;硫化物含量高而碳酸盐矿物含量低的黑色岩系样品,有害元素释放量大,潜在生态风险高,应引起高度重视。 |
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其他语种文摘
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Black shales in the upper Permian stratum outcropped at the Wushan County were collected in this study,approaches including bulk chemical analysis,XRD,sequential chemical extraction and leaching test were applied to reveal occurrences and environmental impacts of toxic elements(TEs)in the black shales. The results showed that the black shales enriched in organic carbon and sulfur,and,therefore,might be formed in a reducing environment. The results also showed that the black shales contained elevated Cd,Cr and other toxic elements,cadmium resided mainly in carbonate minerals,Cr was hosted mainly by silicate minerals,Zn and Ni resides in multiple pools,such as sulfides and organic matters. The occurrences of TEs were highly related to the mineral composition of black shales and varied from sample to sample. The mobility of TEs in weathered soils was likely controlled by occurrences of TEs in the parent rock. Characteristics of high sulfides and low carbonates imply that the black shales can release large amounts of TEs into the supergene environment and pose high potential ecological risks. |
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来源
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矿物岩石地球化学通报
,2021,40(4):938-945 【核心库】
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DOI
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10.19658/j.issn.1007-2802.2021.40.046
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关键词
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黑色岩系
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镉
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有害元素
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赋存状态
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环境风险
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地址
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1.
中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550081
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广州大学环境科学与工程学院, 广州, 510006
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贵州省地质矿产勘查开发局, 贵州省地质矿产中心实验室, 贵阳, 550018
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百色学院农业与食品工程学院, 广西, 百色, 533000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-2802 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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贵州省项目
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国家重点研发计划项目
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百色学院高层次人才启动资金项目
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文献收藏号
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CSCD:7121471
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