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Local electrochemical sample acidification for the detection of Pb2+ traces
Analyst ( IF 3.6 ) Pub Date : 2024-09-04 , DOI: 10.1039/d4an00647j Amira Mahmoud 1 , Július Gajdár 1 , Mariela Brites Helú 1 , Mathieu Etienne 1 , Grégoire Herzog 1
Analyst ( IF 3.6 ) Pub Date : 2024-09-04 , DOI: 10.1039/d4an00647j Amira Mahmoud 1 , Július Gajdár 1 , Mariela Brites Helú 1 , Mathieu Etienne 1 , Grégoire Herzog 1
Affiliation
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Electrochemical detection of pollutants (e.g. heavy metals) in real samples often requires the adjustment of pH to allow optimal sensitivity. Such sample pretreatment can be challenging for on-site applications as it implies the use of valves, pumps and storage of base or acid solutions. We report here the use of an electrochemical approach for the control of water sample pH. It offers the possibility for local pH adjustment while simultaneously detecting Pb2+, whose detection sensitivity is pH dependent. An effective electrochemical method through local electrochemical acidification is performed to detect Pb2+ within a desired pH range without the need to add chemical reagents. Local acidification is based on water electrolysis. An anodic potential is applied to an acidifier to rapidly electrogenerate protons. This allows the sample pH to be tailored to the optimal detection condition. Reduction of the Pt oxide layer formed on the acidifier is key to obtain repeatable results in Pb2+ detection. On-site sample acidification is combined with anodic stripping voltammetry to reach a detection limit of 6 ppb (30 nM), which is lower than the World Health Organization guideline value for Pb2+ level in drinking water.
中文翻译：
用于检测 Pb2+ 痕量的局部电化学样品酸化
实际样品中污染物（例如重金属）的电化学检测通常需要调整 pH 值以实现最佳灵敏度。这种样品预处理对于现场应用来说可能具有挑战性，因为它意味着使用阀门、泵以及碱或酸溶液的存储。我们在这里报告了使用电化学方法来控制水样 pH 值。它提供了在同时检测 Pb 2+ 的同时进行局部 pH 调节的可能性，其检测灵敏度取决于 pH 值。通过局部电化学酸化进行有效的电化学方法，无需添加化学试剂即可在所需pH范围内检测Pb 2+ 。局部酸化基于水电解。将阳极电位施加到酸化器以快速产生质子。这样可以根据最佳检测条件调整样品 pH 值。减少酸化剂上形成的 Pt 氧化层是在 Pb 2+检测中获得可重复结果的关键。现场样品酸化结合阳极溶出伏安法，检测限达到6 ppb (30 nM)，低于世界卫生组织饮用水中Pb 2+水平的指导值。
更新日期：2024-09-04
中文翻译：
用于检测 Pb2+ 痕量的局部电化学样品酸化
实际样品中污染物（例如重金属）的电化学检测通常需要调整 pH 值以实现最佳灵敏度。这种样品预处理对于现场应用来说可能具有挑战性，因为它意味着使用阀门、泵以及碱或酸溶液的存储。我们在这里报告了使用电化学方法来控制水样 pH 值。它提供了在同时检测 Pb 2+ 的同时进行局部 pH 调节的可能性，其检测灵敏度取决于 pH 值。通过局部电化学酸化进行有效的电化学方法，无需添加化学试剂即可在所需pH范围内检测Pb 2+ 。局部酸化基于水电解。将阳极电位施加到酸化器以快速产生质子。这样可以根据最佳检测条件调整样品 pH 值。减少酸化剂上形成的 Pt 氧化层是在 Pb 2+检测中获得可重复结果的关键。现场样品酸化结合阳极溶出伏安法，检测限达到6 ppb (30 nM)，低于世界卫生组织饮用水中Pb 2+水平的指导值。
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