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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
Some indices such as 'contamination degree', 'geoaccumulation index', and 'biological absorption coefficient' were used to assess eco-environmental quality.
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Multi-element analysis of these samples was carried out and the biological absorption coefficient (BAC) was calculated.
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Zinc, W, Mo, Ni and Cr show the maximum biological absorption coefficient (BAC) ranging 0.4-1.7, 0.1-104.6, 1.1-2.6, 0.2-1.6 and 0.2-3.6, respectively, and the results suggest bioaccumulation of these elements in plants.
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However, the BAC (biological absorption coefficient), which is the ratio of lead content in the plant to the lead content in the soil, a measure of relative accumulation, decreased by one to two orders of magnitude, except for grasses and snakeweed.
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| | Large amounts of tailings were produced during mining in the Xiangxi Gold Mine, Hunan. The interaction of tailing with water has caused the release and migration of heavy metals in tailings and the contamination to surfacial environments of water bodies,soils and vegetables. The main contaminating elements are Au, Sb, As, Hg and W, and this is consistent with the elemental enrichment features of tailings. The water migration coefficients of heavy metals in tailings tend to decreased in the order: Au>Cd>W>Sb... | | 湘西金矿在生产过程中产生了大量的尾矿。该区尾矿 水相互作用强烈 ,并引起了尾矿中重金属元素的释放、迁移和对水体、土壤、蔬菜等表生环境的重金属污染。污染程度较大的元素均为Au、Sb、As、Cd、Hg、W等 ,与尾矿中元素的富集特征相一致。尾矿中重金属元素的水迁移能力由大至小顺序为Au、Cd、W、Sb、Pb、As、Zn、Cu。元素的生物吸收系数由大至小顺序为Cd、Au、Zn、Hg、Sb、Cu、Pb、As、W。植物中金属元素浓度主要受土壤中的浓度、植物种类和吸收能力的影响。 | | 文摘来源 | | Concentrations of rare earth elements(REEs)in soil and plant samples collected from different areas,West Guangdong were determined with the ICP-MS method to study geochemical characteristics of these elements.Results show that no big difference was found within a soil-plant system in REEs distribution pattern,but they were detected between soils derived from different parent materials,with the soils derived from granite being the highest in REE concentration.Within a soil profile,REE concentrations were hig... | | 在广东省西部不同地区采取土壤、植物样品,并对其中的稀土元素含量采用ICP-MS法测定,研究了稀土元素在土壤、植物叶中的地球化学特征。结果表明:土壤-植物系统的各环节间稀土元素的含量模式基本相似。不同母岩发育的土壤稀土分布有较大的差异,其中以花岗岩发育的土壤稀土含量最高。在土壤的各个剖面层中,心土层和底土层稀土含量高于表土层,轻重稀土发生分异,均有不同程度的Eu亏损,Ce表现为土壤各层位中的正异常。同一采样点的不同种属植物具有相似的稀土分配模式,在不同母岩发育土壤上生存的同一种属植物稀土分配模式不同,其稀土分布均受其所生存土壤的影响和制约,同时具有自身的生物地球化学特性。生物吸收系数表明植物对稀土元素的吸收能力的差异,稀土元素在由土壤向植物体运输迁移中发生了明显的分馏作用,重稀土相对贫乏。 | | 文摘来源 | |   |
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