城市生活垃圾填埋场垃圾-土壤-植物中汞含量的分布特征
DISTRIBUTION CHARACTERISTICS OF MERCURY IN THE WASTE,SOIL AND PLANT AT MUNICIPAL SOLID WASTE LANDFILLS
查看参考文献31篇
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文摘
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在贵阳和武汉市的4座城市生活垃圾填埋场,研究了其中的生活垃圾、土壤和植物中的汞含量分布特征.结果显示,城市生活垃圾的汞含量分布极不均匀,浓度为0.170～46.222 mg·kg~(-1),几何均值0.574 mg·kg~(-1),一半以上的样品汞含量低于0.5 mg·kg~(-1),个别含量异常偏高,可能是被混入的含汞废弃产品污染了,而各个填埋场的垃圾汞含量几何均值相差不大.不同垃圾填埋场覆盖土壤的汞含量差异显著,反映了填埋场所在区域的土壤背景值以及垃圾填埋活动对覆盖土壤的污染程度,有时覆盖土壤的汞含量超过区域土壤背景值的2～23倍.填埋场附近的农田土壤存在一定的汞污染迹象.填埋场生长的植物因生活习性的不同汞含量分布特征也不同,无喙齿冠草为叶＞根＞茎,狗牙根和硬质早熟禾为地下部分＞地上部分.随着填埋场运行时间的增长,附近生长的苔藓汞含量不断升高,封闭填埋场种植的玉米果实有一部分汞含量超过了食用标准,这些都说明填埋场的运行会给周围的生态环境带来一定的汞污染风险. |
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其他语种文摘
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Mercury ( Hg) in waste, soil and plant wire analyzed at four municipal solid wasle t.MSW) landfills in Guiyutig and Wuhan City, China. The results shown that Hg in MSW was highly heterogeneous, with range of 0. 1 70 IIS, 222 rug o kg ' and Ktometric mean (GM) of 0. 571 tug -kg , tmire than hall of the samples with llg concentration less lhan 0. 5 nig o kg ' , some samples with extremely high Hg content which may he polluted hy the eodisposal ol Hg hearing waste products. Hg CJM concentration of MSW was roughly equal at different landfills. Hg in cover soils varied distinctively hetween different landfills, reflecting the local soil background and the pollution extent caused liy MSW disposed activities, in some eases, Hg content was 2 to 23 times higher than the local soil background. Agricultural soils nearby the landfills also exhibited a sign of Hg pollution. HR distribution pattern WHS dissimilar in different plants growing on the cover soils, with leaf root stem in Myriad is -palensis, underground parts aboveground parts in I'ymxliin thirtyon and l'mi sfihiiinlylmli-s. Hg concentration in moss growing nearby one operational landfill increased obviously with the landfill operation duration, ami Hg in part of corn seeds from a closed landfill exceeds the national edible threshold for grains, this indicated that there have Hg pollution risk associated with MSW landfilling. |
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来源
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地球与环境
,2006,34(4):11-18 【核心库】
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关键词
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汞
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生活垃圾
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填埋场
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土壤
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植物
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分布特征
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地址
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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, 贵州, 贵阳, 550002
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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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1672-9250 |
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学科
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环境科学基础理论 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:2654541
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