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Rapid screening of inorganic arsenic in groundwater on-site by a portable three-channel colorimeter.

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Title: Rapid screening of inorganic arsenic in groundwater on-site by a portable three-channel colorimeter.
Authors: Tuo, Xiaobao1,2,3 (AUTHOR), Duan, Yanhua1,2,3,4 (AUTHOR) duanyh@sustech.edu.cn, Lin, Guanting5 (AUTHOR), Jiang, Tianci2,3 (AUTHOR), Liu, Wenhui1 (AUTHOR), Chen, Fangyi5 (AUTHOR), Xie, Xianjun1 (AUTHOR), Zheng, Yan1,2,3,4 (AUTHOR) yan.zheng@sustech.edu.cn
Source: Journal of Environmental Sciences (Elsevier). Jul2025, Vol. 153, p158-171. 14p.
Subject Terms: *Groundwater sampling, *Drinking water, *Groundwater, Engineering design, Detection limit
Abstract: Rapid screening of inorganic arsenic (iAs) in groundwater used for drinking by hundreds of millions of mostly rural residents worldwide is crucial for health protection. Most commercial field test kits are based on the Gutzeit reaction that uses mercury-based reagents for color development, an environmental concern that increasingly limits its utilization. This study further improves the Molybdenum Blue (MB) colorimetric method to allow for faster screening with more stable reagents. More importantly, a portable three-channel colorimeter is developed for screening iAs relative to the WHO drinking water guideline value (10 µg/L). Adding the reducing reagents in sequence not only prolongs the storage time to > 7 days, but also accelerates the color development time to 6 min in conjunction with lowering the H 2 SO 4 concentration in chromogenic reagents. The optimal pH ranges from 1.2 to 1.3 and is achieved by acidifying groundwater to 1% (V/V) HCl. With detection limits of 3.7 µg/L for inorganic arsenate (iAs(V)) and 3.8 µg/L for inorganic arsenite (iAs(III)), testing groundwater with ∼10 µg/L of As has a precision < 20%. The method works well for a range of phosphate concentrations of 48–950 µg/L (0.5–10 µmol/L). Concentrations of total_iAs (6–300 µg/L), iAs(V) (6–230 µg/L) and iAs(III) (0–170 µg/L) for 14 groundwater samples from Yinchuan Plain, Pearl River Delta, and Jianghan Plain, are in excellent agreements (linear regression slope: 0.969–1.029) with the benchmark methods. The improved chemistry here lays the foundation for the MB colorimetric method to become a commercially viable screening tool, with further engineering and design improvement of the colorimeter. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Environmental Sciences (Elsevier) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Rapid screening of inorganic arsenic in groundwater on-site by a portable three-channel colorimeter.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Tuo%2C+Xiaobao%22&quot;&gt;Tuo, Xiaobao&lt;/searchLink&gt;&lt;relatesTo&gt;1,2,3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Duan%2C+Yanhua%22&quot;&gt;Duan, Yanhua&lt;/searchLink&gt;&lt;relatesTo&gt;1,2,3,4&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; duanyh@sustech.edu.cn&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Lin%2C+Guanting%22&quot;&gt;Lin, Guanting&lt;/searchLink&gt;&lt;relatesTo&gt;5&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Jiang%2C+Tianci%22&quot;&gt;Jiang, Tianci&lt;/searchLink&gt;&lt;relatesTo&gt;2,3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Liu%2C+Wenhui%22&quot;&gt;Liu, Wenhui&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Chen%2C+Fangyi%22&quot;&gt;Chen, Fangyi&lt;/searchLink&gt;&lt;relatesTo&gt;5&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Xie%2C+Xianjun%22&quot;&gt;Xie, Xianjun&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zheng%2C+Yan%22&quot;&gt;Zheng, Yan&lt;/searchLink&gt;&lt;relatesTo&gt;1,2,3,4&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; yan.zheng@sustech.edu.cn&lt;/i&gt;
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Rapid screening of inorganic arsenic (iAs) in groundwater used for drinking by hundreds of millions of mostly rural residents worldwide is crucial for health protection. Most commercial field test kits are based on the Gutzeit reaction that uses mercury-based reagents for color development, an environmental concern that increasingly limits its utilization. This study further improves the Molybdenum Blue (MB) colorimetric method to allow for faster screening with more stable reagents. More importantly, a portable three-channel colorimeter is developed for screening iAs relative to the WHO drinking water guideline value (10 &#181;g/L). Adding the reducing reagents in sequence not only prolongs the storage time to &gt; 7 days, but also accelerates the color development time to 6 min in conjunction with lowering the H 2 SO 4 concentration in chromogenic reagents. The optimal pH ranges from 1.2 to 1.3 and is achieved by acidifying groundwater to 1% (V/V) HCl. With detection limits of 3.7 &#181;g/L for inorganic arsenate (iAs(V)) and 3.8 &#181;g/L for inorganic arsenite (iAs(III)), testing groundwater with ∼10 &#181;g/L of As has a precision &lt; 20%. The method works well for a range of phosphate concentrations of 48–950 &#181;g/L (0.5–10 &#181;mol/L). Concentrations of total_iAs (6–300 &#181;g/L), iAs(V) (6–230 &#181;g/L) and iAs(III) (0–170 &#181;g/L) for 14 groundwater samples from Yinchuan Plain, Pearl River Delta, and Jianghan Plain, are in excellent agreements (linear regression slope: 0.969–1.029) with the benchmark methods. The improved chemistry here lays the foundation for the MB colorimetric method to become a commercially viable screening tool, with further engineering and design improvement of the colorimeter. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Journal of Environmental Sciences (Elsevier) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.jes.2024.04.014
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 158
    Subjects:
      – SubjectFull: Groundwater sampling
        Type: general
      – SubjectFull: Drinking water
        Type: general
      – SubjectFull: Groundwater
        Type: general
      – SubjectFull: Engineering design
        Type: general
      – SubjectFull: Detection limit
        Type: general
    Titles:
      – TitleFull: Rapid screening of inorganic arsenic in groundwater on-site by a portable three-channel colorimeter.
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            NameFull: Tuo, Xiaobao
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            NameFull: Duan, Yanhua
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            NameFull: Lin, Guanting
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            NameFull: Jiang, Tianci
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            NameFull: Liu, Wenhui
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            NameFull: Chen, Fangyi
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            NameFull: Xie, Xianjun
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            – D: 01
              M: 07
              Text: Jul2025
              Type: published
              Y: 2025
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              Value: 153
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            – TitleFull: Journal of Environmental Sciences (Elsevier)
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