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首页> 外文期刊>Environmental Science & Technology >Arsenic Speciation in Plankton Organisms from Contaminated Lakes: Transformations at the Base of the Freshwater Food Chain
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Arsenic Speciation in Plankton Organisms from Contaminated Lakes: Transformations at the Base of the Freshwater Food Chain

机译：受污染湖泊浮游生物中的砷形态：淡水食物链基础上的转化

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摘要

The two complementary techniques high performance liquid chromatography-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS) and X-ray absorption near edge structure (XANES) analysis were used to assess arsenic speciation in freshwater phytoplankton and zooplankton collected from arsenic-contaminated lakes in Yellowknife (Northwest Territories, Canada). Arsenic concentrations in lake water ranged from 7 //g L~(-1) in a noncontami- nated lake to 250 μg L~(-1) in mine-contaminated lakes, which resulted in arsenic concentrations ranging from 7 to 340 mg kg~(-1) d.w. in zooplankton organisms (Cyclops sp.) and from 154 to 894 mg kg d.w. in phytoplankton. The main arsenic compounds identified by HPLC-ICP-MS in all plankton were inorganic arsenic (from 38% to 98% of total arsenic). No other arsenic compounds were found in phytoplankton, but zooplankton organisms showed the presence of organoarsenic compounds, the most common being the sulfate arsenosugar, up to 47% of total arsenic, with traces of phosphate sugar, glycerol sugar, methylarsonate (MMA), and dimethylarsinate (DMA). In the uncontaminated Grace Lake, zooplankton also contained arsenobetaine (AB). XANES characterization of arsenic in the whole plankton samples showed As~v-O as the only arsenic compound in phytoplankton, and As~III-S and As~v-O compounds as the two major inorganic arsenic species in zooplankton. The proportion of organoarsenicals and inorganic arsenic in zooplankton depends upon the arsenic concentration in lakes and shows the impact of arsenic contamination: zooplankton from uncontaminated lake has higher proportions of organoarsenic compounds and contains arsenobetaine, while zooplankton from contaminated area contains mostly inorganic arsenic.
机译：两种互补技术采用高效液相色谱-电感耦合等离子体质谱法（HPLC-ICP-MS）和X射线吸收近边缘结构（XANES）分析来评估从受砷污染的浮游植物和浮游动物中的砷形态。耶洛奈夫（加拿大西北地区）的湖泊。湖泊水中的砷浓度范围从非污染湖泊中的7 // g L〜（-1）到被矿井污染的湖泊中的250μgL〜（-1），导致砷浓度范围从7至340 mg kg 〜（-1）滴水浮游生物（Cyclops sp。）中的含量为154至894 mg kg d.w.在浮游植物中。通过HPLC-ICP-MS在所有浮游生物中鉴定出的主要砷化合物为无机砷（占总砷的38％至98％）。在浮游植物中未发现其他砷化合物，但浮游动物生物体显示有机砷化合物的存在，最常见的是硫酸砷糖，占砷总量的47％，并带有微量的磷酸糖，甘油糖，甲基砷酸甲酯（MMA）和砷酸二甲酯（DMA）。在未被污染的格雷斯湖中，浮游动物还含有砷甜菜碱（AB）。整个浮游生物样品中砷的XANES表征显示，浮游植物中As〜v-O是唯一的砷化合物，浮游动物中As〜III-S和As〜v-O化合物是两种主要的无机砷。浮游动物中有机砷和无机砷的比例取决于湖泊中的砷浓度，并显示出砷污染的影响：未受污染的湖泊中的浮游动物具有较高比例的有机砷化合物并含有砷甜菜碱，而受污染地区的浮游动物则主要含有无机砷。

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  • 来源
    《Environmental Science & Technology》 |2011年第23期|p.9917-9923|共7页
  • 作者

    Guilhem Caumette; Iris Koch; Esteban Estrada; Ken J. Reimer;

  • 作者单位

    Environmental Sciences Group, Royal Military College of Canada, P.O. Box 17000 Station Forces, Kingston, Ontario K7K7B4, Canada;

    Environmental Sciences Group, Royal Military College of Canada, P.O. Box 17000 Station Forces, Kingston, Ontario K7K7B4, Canada;

    Environmental Sciences Group, Royal Military College of Canada, P.O. Box 17000 Station Forces, Kingston, Ontario K7K7B4, Canada;

    Environmental Sciences Group, Royal Military College of Canada, P.O. Box 17000 Station Forces, Kingston, Ontario K7K7B4, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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