Evaluation of arsenic field test kits for drinking water: Recommendations for improvement and implications for arsenic affected regions such as Bangladesh
Evaluation of arsenic field test kits for drinking water: Recommendations for improvement and implications for arsenic affected regions such as Bangladesh
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DOI：
10.1016/j.watres.2019.115325
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发表时间：
2020-03-01
期刊：
影响因子：
12.8
通讯作者：
Hayes, Kim F.
中科院分区：
文献类型：
--
作者：
Reddy, Raghav R.;Rodriguez, Grace D.;Hayes, Kim F.
砷现场检测试剂盒被广泛用于测量饮用水水源中的砷水平，特别是在孟加拉国这样的国家，这些国家的供水高度分散，水质检测基础设施有限。从公共卫生的角度来看，测量技术区分相关和可操作的饮用水标准之上和之下的样本的能力至关重要。在这项研究中，通过将试剂盒估计值与氢化物发生原子吸收光谱分析(HG-AAS)分析进行比较，评估了8种商用现场测试试剂盒的性能。对用户依赖的配色误差进行控制的测试结果显示，两个试剂盒(LaMotte和Quick II试剂盒)提供了准确和精确的砷估计，四个试剂盒(Econo-Quick，Quick，Wagtech和Merck试剂盒)要么准确或精密，但不能两者兼而有之，而两个试剂盒(HACH和Econo-Quick II试剂盒)既不准确也不精确。对天然水和经处理的水(如社区饮用水过滤系统)中常见的砷浓度范围进行了测试，并对去离子水中实验室产生的砷标准进行了测试。对于那些表现不佳的试剂盒，与制造商提供的砷颜色校准图表相比，测试条产生的颜色往往太浅。基于这些结果，我们建议利益相关者仔细重新考虑使用性能较差的现场检测试剂盒，直到对这些试剂盒的组件进行更好的质量控制。此外，我们建议现场检测试剂盒制造商在每个试剂盒中提供适当的内部标准，以供用户验证制造商提供的色卡的准确性。(C)2019年提交人。爱思唯尔有限公司出版。
Arsenic field test kits are widely used to measure arsenic levels in drinking water sources, especially in countries like Bangladesh, where water supply is highly decentralized and water quality testing infrastructure is limited. From a public health perspective, the ability of a measurement technique to distinguish samples above and below relevant and actionable drinking water standards is paramount. In this study, the performance of eight commercially available field test kits was assessed by comparing kit estimates to hydride generation atomic absorption spectroscopy (HG-AAS) analyses. The results of tests that control for user-dependent color matching errors showed that two kits (LaMotte and Quick II kits) provided accurate and precise estimates of arsenic, four kits (Econo-Quick, Quick, Wagtech and Merck kits) were either accurate or precise, but not both, and two kits (Hach and Econo-Quick II kits) were neither accurate nor precise. Tests were performed for arsenic concentration ranges commonly found in natural waters and treated waters (such as community drinking water filter systems), and also on laboratory generated arsenic standards in DI water. For those kits that did not perform well, test strips often produced colors too light compared to manufacturer-provided arsenic color calibration charts. Based on these results, we recommend stakeholders carefully re-consider the use of poorly performing field test kits until better quality control of components of these kits is implemented. In addition, we recommend that field test kit manufacturers provide suitable internal standards in every kit box for users to verify the veracity of manufacturer provided color charts. (C) 2019 The Authors. Published by Elsevier Ltd.