Rapid and selective quantitative colourimetric analysis of nitrite in water using a S-Nitrosothiol based method

IF 7.2 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research X Pub Date : 2024-10-11 DOI:10.1016/j.wroa.2024.100265

E. Latvyte , A. Greenwood , A. Bogush , J.E. Graves

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Abstract

This study introduces a novel S-nitrosothiol based method for the rapid and highly selective detection of nitrite in complex water matrices. Sodium 3-mercapto-1-propanesulfonate forms a distinctive pink S-nitrosothiol compound upon interaction with nitrite in acidic media, allowing both visual and quantitative detection. Various factors affecting the absorbance of the final product were investigated, including pH, reaction time, acid type, and sodium 3-mercapto-1-propanesulfonate concentration. UV–Vis spectrophotometric analysis demonstrated an excellent linear correlation (R² = 0.99) across a broad detection range (0.05 to 80 mmol l^-1), while showing no interference from common ions such as nitrate or dissolved organic matter, a limitation frequently observed in conventional UV-based nitrite detection methods. The assay was further adapted into a pellet form to simplify field use, operating effectively at room temperature with a low detection limit (1.4 ppm). The S-nitrosothiol based method represents a safer and more environmentally friendly option for nitrite detection and shows a promising potential as a valuable addition to both field and laboratory water testing kits for nitrite analysis.

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使用基于 S-亚硝基硫醇的方法快速、选择性地定量比色分析水中的亚硝酸盐

本研究介绍了一种基于 S-亚硝硫醇的新型方法，用于快速、高选择性地检测复杂水基质中的亚硝酸盐。在酸性介质中，3-巯基-1-丙磺酸钠与亚硝酸盐作用后形成一种独特的粉红色 S-亚硝基硫醇化合物，可进行目测和定量检测。研究了影响最终产物吸光度的各种因素，包括 pH 值、反应时间、酸类型和 3-巯基-1-丙磺酸钠浓度。紫外-可见分光光度分析在很宽的检测范围（0.05 至 80 mmol l-1）内显示出极好的线性相关性（R2 = 0.99），同时没有显示出常见离子（如硝酸盐或溶解有机物）的干扰，而这正是基于紫外的传统亚硝酸盐检测方法经常出现的局限性。为了简化现场使用，该检测方法被进一步改装成颗粒状，可在室温下有效工作，检测限低（1.4 ppm）。这种基于 S-亚硝硫醇的方法是一种更安全、更环保的亚硝酸盐检测方法，有望成为现场和实验室亚硝酸盐分析水检测试剂盒的重要补充。

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来源期刊

Water Research X Environmental Science-Water Science and Technology

CiteScore

12.30

自引率

1.30%

发文量

期刊介绍： Water Research X is a sister journal of Water Research, which follows a Gold Open Access model. It focuses on publishing concise, letter-style research papers, visionary perspectives and editorials, as well as mini-reviews on emerging topics. The Journal invites contributions from researchers worldwide on various aspects of the science and technology related to the human impact on the water cycle, water quality, and its global management.