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首页> 外文期刊>Environmental Science & Technology >DGT Measurement of Dissolved Aluminum Species in Waters:Comoarina Chelex-100 and Titanium Dioxide-Based Adsorbents
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DGT Measurement of Dissolved Aluminum Species in Waters:Comoarina Chelex-100 and Titanium Dioxide-Based Adsorbents

机译：DGT测定水中的溶解铝物种：Comoarina Chelex-100和二氧化钛基吸附剂

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摘要

Aluminum is acutely toxic, and elevated concentrations of dissolved Al can have detrimental effects on bod, terrestrial and aquatic ecosystems. Robust analytical methods that can determine environmentally relevant Al fractions accurately and efficiently are required by the environmental monitoring community. A simple robust passive sampling method, the diffusive gradients in thin films (DGT) technique, was evaluated for the measurement of dissolved Al species in freshwater and manne water using either Chelex-100 or Metsorb (a titanium dioxide-based binding agent) as the adsorbent. Mass vs time DGT deployments at pH 5.0S (Al_(3+) and Al(OH)~(2+) dominate) and 8.35 (Al(OH)_4~- dominates) demonstrated linear uptake of Al (R~2 = 0.989 and 0.988, respectively) for Metsorb. Similar deployments of Chelex-DGT showed linear uptake at pH 5.05 (R~2 = 0.994); however, at pH 8.35 the mass of Al accumulated was 40-70% lower than predicted suggesting that Chelex-100 is not suitable for Al measurements at high pH. The Metsorb-DGT measurement was independent of pH (5.0-8.5) and ionic sttength (0.001-0.7 mol L~(-1) NaNO_3), whereas the Chelex-DGT measurement was only independent of ionic strength at pH 5.0 At pH 8.4, increasing ionic strength led to considerable underestimation (up to 67%) of Al concentration. Deployments of Metsorb-DGT (up to 4 days) in synthetic freshwater (pH range 5.4-8.1) and synthetic seawater (pH 8.15) resulted in linear mass uptakes, and the concentration measured by DGT agreed well with solution concentrations. Conversely, deployment of Chelex-DGT in synthetic seawater and freshwater (pH ≥7.7 Al(OH)_4~- dominant species) resulted in a decrease in accumulated mass with increasing deployment time. In situ field evaluations in fresh, estuarine, and marine waters confirmed that Metsorb-DGT was more accurate than Chelex-DGT for the measurement of dissolved Al in typical environmental waters.
机译：铝具有剧毒，溶解的铝浓度升高可能会对生化，陆地和水生生态系统产生不利影响。环境监测界需要能够准确，有效地确定与环境有关的铝含量的可靠分析方法。使用Chelex-100或Metsorb（基于二氧化钛的粘合剂）作为评估方法，评估了一种简单而健壮的被动采样方法，即薄膜中的扩散梯度（DGT）技术，用于测量淡水和Manne水中的溶解Al物种。吸附剂。在pH 5.0S（Al_（3+）和Al（OH）〜（2+）为主）和8.35（Al（OH）_4〜-为主）的DGT部署下质量与时间的关系表明铝的线性吸收（R〜2 = 0.989分别为0.988和0.988）。 Chelex-DGT的类似展开显示在pH 5.05时线性吸收（R〜2 = 0.994）。但是，在pH 8.35时，所积累的Al的质量比预期的要低40-70％，这表明Chelex-100不适合在高pH下进行Al的测量。 Metsorb-DGT的测量与pH（5.0-8.5）和离子强度（0.001-0.7 mol L〜（-1）NaNO_3）不相关，而Chelex-DGT的测量仅与pH 5.0的离子强度无关（pH 8.4），离子强度的提高导致铝浓度大大低估（最高67％）。在合成淡水（pH范围5.4-8.1）和合成海水（pH 8.15）中部署Metsorb-DGT（长达4天）导致线性的质量吸收，并且DGT测量的浓度与溶液浓度非常吻合。相反，Chelex-DGT在合成海水和淡水（pH≥7.7 Al（OH）_4〜-占优势的物种）中的部署导致累积质量随着部署时间的增加而减少。在淡水，河口和海水中的现场评估表明，Metsorb-DGT在测量典型环境水中溶解的Al方面比Chelex-DGT更准确。

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  • 来源
    《Environmental Science & Technology》 |2012年第4期|p.2267-2275|共9页
  • 作者

    Jared G. Panther; William W. Bennett; Peter R. Teasdale; David T. Welsh; Huijun Zhao;

  • 作者单位

    Environmental Futures Centre, Griffith University, Gold Coast Campus, QLD 4222, Australia;

    Environmental Futures Centre, Griffith University, Gold Coast Campus, QLD 4222, Australia;

    Environmental Futures Centre, Griffith University, Gold Coast Campus, QLD 4222, Australia;

    Environmental Futures Centre, Griffith University, Gold Coast Campus, QLD 4222, Australia;

    Environmental Futures Centre, Griffith University, Gold Coast Campus, QLD 4222, Australia;

  • 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
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