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首页> 外文学位 >Geochemical speciation as a predictor of copper toxicity in low alkalinity, soft waters of East Texas.
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Geochemical speciation as a predictor of copper toxicity in low alkalinity, soft waters of East Texas.

机译：地球化学形态预测东得克萨斯州软弱水体中铜的毒性。

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摘要

The biotic ligand model (BLM) provides a way to produce site-specific ambient water quality criteria for metals through an equilibrium geochemical modeling framework. Since copper is now the third most used metal in the world, more information is needed to understand its speciation, and its toxicity to organisms in soft water with neutral to low pH and low alkalinity. Waters from eight East Texas rivers and streams which exhibited these characteristics was used in this study. Analysis confirmed the pH of the samples ranging from 3.75--8.65 with alkalinity ranging from 22--56 mg CaCO3·L -1 and total hardness ranging from 40--78 mg CaCO 3·L-1. Concentrations of K+, Na+, Ca2+, Cl- and Cu 2+ were measured in the samples with ion selective electrodes. The water-quality parameters found in each of the natural waters were used in the chemical speciation program, Visual MINTEQ, to evaluate how copper complexes and in what concentrations in these waters. The two copper complexes in the highest concentrations were Cu2+ and CuCO3. Titrations were preformed on the natural waters to see how much CuSO4 was needed to reach three concentrations of ionic copper (1.57x10-8 , 1.57x10-7 and 1.57x10-6 MCu2+) and a statistical difference was found between what was measured and what Visual MINTEQ reported at the two lower concentrations. EC50 values of the toxicity tests in pH 5 ranged from 0.54--2.57 microg·L-1 Cu2+, pH 6 ranged from 3.73--6.6 microg·L-1 Cu2+ and pH 7 ranged from 6.21--17.53 microg·L-1 Cu2+. At pH 5 and 6 an over prediction occurred by the BLM and at pH 7 an under prediction occurred.
机译：生物配体模型（BLM）提供了一种通过平衡地球化学建模框架为金属生成特定地点的环境水质标准的方法。由于铜现在是世界上第三大使用金属，因此需要更多信息来了解其形态以及在中性至低pH和低碱度的软水中对生物的毒性。这项研究使用了来自东德克萨斯州的八条河流和溪流的水，这些水和水具有这些特征。分析证实样品的pH值为3.75--8.65，碱度为22--56 mg CaCO3·L -1，总硬度为40--78 mg CaCO 3·L-1。在带有离子选择电极的样品中测量了K +，Na +，Ca2 +，Cl-和Cu 2+的浓度。在化学物种形成程序Visual MINTEQ中使用了每种天然水中发现的水质参数，以评估这些水中铜的络合方式和浓度。最高浓度的两种铜络合物为Cu2 +和CuCO3。在天然水体上进行了滴定，以查看需要多少CuSO4才能达到三种浓度的离子铜（1.57x10-8、1.57x10-7和1.57x10-6 MCu2 +），并且在测量值与测量值之间存在统计差异。 Visual MINTEQ报告了两种较低的浓度。 pH 5的毒性试验的EC50值为0.54--2.57 microg·L-1 Cu2 +，pH 6的浓度为3.73--6.6 microg·L-1 Cu2 +，pH 7的浓度为6.21--17.53 microg·L-1铜2+在pH 5和6时，BLM发生过度预测，而在pH 7时，发生预测不足。

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  • 作者

    Sanders, Meredith P.;

  • 作者单位

    Stephen F. Austin State University.;

  • 授予单位 Stephen F. Austin State University.;
  • 学科 Environmental Sciences.;Remote Sensing.;Geochemistry.
  • 学位 M.S.
  • 年度 2009
  • 页码 62 p.
  • 总页数 62
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境科学基础理论;地质学;遥感技术;
  • 关键词

  • 入库时间 2022-08-17 11:38:30

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