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首页> 外文期刊>Environmental Science & Technology >Preservation of Inorganic Arsenic Species in Groundwater
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Preservation of Inorganic Arsenic Species in Groundwater

机译：地下水中无机砷的保存

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摘要

The objective of this research was to develop a robust preservation method for stabilizing inorganic As(lll/V) species in synthetic and actual groundwaters.Ethylenediamine-tetraacetic acid (EDTA),H_2SO_4,H_3PO_4,and EDTA-acetic acid (HAc) were evaluated in synthetic groundwater containing 3 mg/L Fe(II) in the pH range 6.5-8.4 and Eh range -100 to +200 mV at room temperature.In the absence of strong UV light,only EDTA-HAc was found to be an effective preservative under all the experimental conditions tested.A total of 89 samples (including 16 samples in triplicate) from 55 drinking water wells in Minnesota,California,and North Dakota were preserved with a combination of EDTA-HAc and speciated to evaluate its effectiveness for preserving inorganic arsenic species in actual groundwater samples.The preserved and field-speciated samples were repeatedly speciated and analyzed in the laboratory for up to 85 days after collection.Field-speciated As(III) concentrations were compared with the As(III) concentrations in the preserved samples.The results were highly correlated (slope 0.9773,R~2 = 0.9986),which indicates that during sample transportation and storage the distribution of arsenic species did not change for samples preserved with EDTA-HAc.
机译：这项研究的目的是开发一种稳定的方法来稳定合成和实际地下水中的无机As（III / V）物种。评估了乙二胺四乙酸（EDTA），H_2SO_4，H_3PO_4和EDTA乙酸（HAc）在室温下，在pH为6.5-8.4，Eh为-100至+200 mV的，含3 mg / L Fe（II）的合成地下水中，在没有强紫外线的情况下，只有EDTA-HAc被发现是有效的用EDTA-HAc组合保存了明尼苏达州，加利福尼亚州和北达科他州的55个饮用水井中的89个样品（包括一式三份的三份样品），并结合使用EDTA-HAc进行了保存，专门评估了其保存的有效性实际地下水样本中的无机砷物种。收集后的样本中，对保存和现场指定的样本进行重复指定并在实验室中进行长达85天的分析，并将现场指定的As（III）浓度与As进行比较结果高度相关（斜率0.9773，R〜2 = 0.9986），这表明在EDTA-HAc保存的样品中，砷的分布和运输过程中砷的分布没有变化。

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  • 来源
    《Environmental Science & Technology》 |2005年第22期|p.8877-8882|共6页
  • 作者

    GAUTAM SAMANTA; DENNIS A.CLIFFORD;

  • 作者单位

    Department of Civil and Environmental Engineering,University of Houston,N 107 Engineering Building 1,Houston,Texas,77204-4003;

    Department of Civil and Environmental Engineering,University of Houston,N 107 Engineering Building 1,Houston,Texas,77204-4003;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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