Results 31 to 40 of about 610 (133)
Migration Characteristics and Environmental Quality Assessment of Heavy Metal Elements in the Rock-Soil System in Qiongzhong, Hainan Island [PDF]
The rock-soil system is an important component of the Earth’s critical zone, but there are few detailed studies on different soil systems in Hainan Island.
Hongkun ZHAO +6 more
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Heavy Metal Contamination in the Soil of a Copper Mine [PDF]
, 2009 通过对某铜矿区土壤重金属含量及化学形态分布进行分析,探讨了采矿过程中的重金属在土壤中的积累特征。结果表明,该矿区的Cu、zn、Pb、Cd、nI在土壤中的积累程度相当高。各采样点的重金属综合污染递减顺序依次为:堆浸泥>最后沉淀池>堆浸矿>堆浸土>金矿排污口污泥>原生土壤>铜矿区下游江边土壤。堆浸矿土壤的重金属以残渣态、水溶态、有机质硫化态这三种组分为主,而堆浸泥土壤则以fE-Mn氧化物结合态为主。Through analysis of heavy metals content and speciation
欧阳通, 许雅玲, 陈江奖
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Distribution Characteristics and Source Analysis of Soil Heavy Metals in the Liaoyang—Dandong Region [PDF]
The Liaoyang—Dandong region is an important grain and cash crop production area in Liaoning Province. It is of great significance for monitoring the quality of black soil and studying the migration and transformation of heavy metals in soil to understand
Cang GONG +9 more
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Shuitu Baochi Xuebao, 2011 运用对照分析方法,以大庆市七五土壤重金属含量、黑龙江省土壤背景值和国家土壤环境质量标准为对照,对比分析大庆地区不同土地利用类型(工业用地,未利用地,草地,旱田和水田)土壤10种重金属(As、Cd、Cr、Cu、Hg、Ni、Pb、Zn、V、Mn)含量变化规律,并进行了生态危害评价。结果显示:As、Zn、Hg、Pb含量最高的是工业用地,Cd、Cr、Cu、Ni、Mn、V含量最高的是旱田,其次草地,水田和未利用地土壤重金属含量较低;对比七五大庆市土壤重金属含量发现,除V外,其余含量都有所增加,以Hg、As ...
赵淑苹, 陈立新
doaj
城市污泥与湖泊底泥土地利用对土壤-植物系统中养分及重金属Cd、Pb的影响
Shuitu Baochi Xuebao, 2006 采用田间小区试验，探讨了城市污泥与湖泊底泥土地利用对土壤-植物系统中养分及重金属Cd、Pb的影响。结果表明，城市污泥与湖泊底泥能有效增加土壤养分含量；重金属Cd、Pb仅累积在土壤耕层，难以向下迁移；随施用量的增加，小麦籽粒产量及其对养分的吸收量均随之增加，但仍有大量养分存留在土壤中；植株对重金属的富集顺序表现为根系〉茎叶〉籽粒，Cd〉Pb，其中，籽粒中重金属Cd、Pb含量均未超出我国食品中重金属限量的卫生标准；如果该污泥、底泥分别以100，200t／hm^2的施用量施入土壤 ...
付克强 +3 more
doaj +2 more sources
Passivation Effect of Thiol-Modified Montmorillonite on Cadmium in Medium-Alkaline Farmland Soil in Northern China [PDF]
Passivation material is a key material for repairing heavy metal contaminated soil in farmland. To study and develop efficient soil heavy metal passivator, thiol-modified montmorillonite was studied.
Chao REN +5 more
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Shuitu Baochi Xuebao, 2007 在喀斯特边远农区典型植烟县采取代表性植烟土壤样品66个,研究县级尺度下植烟土壤重金属含量及其特征。结果表明,Pb,Hg,Cr 3种重金属含量全部符合国家土壤环境质量二级标准,As含量符合国家土壤环境质量二级标准的样点数高达98.5%,4种重金属环境状况良好,无污染。Cd含量符合国家土壤环境质量二级标准样点数占69.7%,且有10.1%的样点含量高于国家土壤环境质量三级标准,部分植烟土壤已受到染污。3种不同植烟土壤类型重金属含量差异较大,石灰土Cd,Hg,As平均含量最高（分别为0.51 m g/kg,0.
秦松, 王正银, 刘明竞
doaj
Application of Energy Dispersive X-ray Fluorescence Spectroscopy in Analysis of Heavy Metals in Soil: A Review [PDF]
With the process of urbanization and industrialization, heavy metals enter the ecological environment through various pathways and accumulate in large quantities in the soil, causing potential risks to soil environmental health. In recent years, with the
Aosong JIANG, Longhua WU, Zhu LI
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Shuitu Baochi Xuebao, 2006 通过详细的调查分析，研究了浙江省优势农产区表层土壤重金属分异特征及其现状，并探讨了各种影响因素。904个代表性样品的分析结果表明，除As和Hg以外，Cd、Cr、Pb、Zn、Cu及Ni的含量均高于浙江省第2次土壤普查得到的表层土壤重金属含量；与杭嘉湖平原、浙江省、中国及世界土壤背景值的对比发现，研究区土壤大部分重金属元素的含量明显偏高，根据国家二级标准限值得出的单项评价结果表明，Cd和Ni的超标指数较高，分别达到lO．72％和9．7％。Hg、Pb、Cu和Cr次之，分别为6．80％，5，35％，3．43 ...
程街亮 +4 more
doaj +2 more sources
Researches on Chemical Behavior and Influencing Factors of Heavy Metals in Soil and Corps of Xiang’an, Xiamen [PDF]
, 2007 翔安区是厦门市主要农作物生产基地。本文通过采用电热板消解法对土壤样品进行消解，并用ICP-MS测定其中重金属含量，测得金属含量范围和平均值分别为：Zn(45.520~229.080mg/kg,153.800mg/kg),Pb(24.372~111.504mg/kg,73.258mg/kg),Cr(6.249~134.400mg/kg,48.504mg/kg),As(5.783~56.052mg/kg,27.092mg/kg),Cu(4.573~46.032mg/kg,18.399mg/kg),Ni(1 ...
黄智伟
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