Rapid low-level nitrate determination by UV spectroscopy in the presence of competing ions.

IF 2.7 3区化学 Q2 CHEMISTRY, ANALYTICAL Analytical Methods Pub Date : 2024-11-19 DOI:10.1039/d4ay01641f

S E Mackay, D S Eldridge, F Malherbe

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Abstract

The presence of excessive nitrate in environmental and drinking water even at low levels can pose both environmental and health hazards. Because of this, various methods for its removal have been investigated. Essential to conducting such research is a method to reliably quantify nitrate in relevant matrices. However, current approaches have drawbacks related to cost, analysis time or health hazards. This study evaluates a UV spectroscopy-based method for nitrate determination, suitable for quantifying low nitrate concentrations in the presence of bicarbonate, sulfate, chloride and phosphate. The limits of detection and quantification were found to be 0.003 ppm N and 0.0077 ppm N respectively, lower than that observed in the ion chromatography method it was compared to. Additionally, a calibration curve created with 11 standards ranging from 0 to 2.5 ppm N demonstrated an exceptionally strong correlation, with an R² value greater than 0.9999. This method is developed with a focus on accessibility and speed, minimising hazards and waste generation for reduced environmental footprint. The effects of contaminants introduced through the use of commercial laboratory consumables are also discussed.

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在存在竞争离子的情况下利用紫外光谱快速测定低浓度硝酸盐。

环境和饮用水中存在过量的硝酸盐，即使含量很低，也会对环境和健康造成危害。因此，人们对各种去除硝酸盐的方法进行了研究。进行此类研究的关键是找到一种能可靠量化相关基质中硝酸盐含量的方法。然而，目前的方法在成本、分析时间或健康危害方面存在缺陷。本研究评估了一种基于紫外光谱的硝酸盐测定方法，该方法适用于对存在碳酸氢盐、硫酸盐、氯化物和磷酸盐的低浓度硝酸盐进行定量。研究发现，该方法的检测限和定量限分别为 0.003 ppm N 和 0.0077 ppm N，低于与之相比的离子色谱法。此外，用 11 种标准物质（从 0 到 2.5 ppm N）绘制的校准曲线显示出极强的相关性，R2 值大于 0.9999。该方法的开发重点是方便快捷，最大限度地减少危害和废物的产生，从而降低对环境的影响。此外，还讨论了通过使用商用实验室耗材引入污染物的影响。

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