Inexpensive spectrophotometric determination of nitrite with a laboratory-constructed flow cell

IF 1.3 4区工程技术 Q4 CHEMISTRY, ANALYTICAL

Instrumentation Science & Technology Pub Date : 2022-08-08 DOI:10.1080/10739149.2022.2108440

Mohsen Salimi, S. Nouroozi

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引用次数: 0

Abstract

Abstract Nitrite is a carcinogenic substance and its measurement in water samples is important to protect mankind. Here we have introduced a simple and inexpensive fluidic system for the online determination of nitrite in water samples. For this purpose, a highly sensitive, optical flow cell detector was fabricated and used in a fluidic system to prepare a compact unit for nitrite monitoring. Safranin solution in acidic media was used in the system for the sensitive and selective determination of nitrite. In acidic media, nitrite reacted with safranin to form a diazonium salt which caused the dye in the solution to change from reddish-orange to blue. The safranin solution absorbance, which is related to nitrite concentration, was monitored by the fabricated photometer with the flow detector at 525 nm. Water samples were processed to evaluate the effectiveness of both the introduced system and the analytical procedure. Good analytical performance was obtained, including a linear response from 0.3 up to 3 mg/l nitrite (r = 0.9918) with a detection limit of 0.1 mg/l and a relative standard deviation of 4.24% (n = 10), using the proposed setup.

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流动池光度法测定亚硝酸根的研究

摘要亚硝酸盐是一种致癌物质，其在水样中的检测对保护人类具有重要意义。在这里，我们介绍了一种简单廉价的流体系统，用于在线测定水样中的亚硝酸盐。为此，制造了一种高灵敏度的光学流动池检测器，并将其用于流体系统中，以制备用于亚硝酸盐监测的紧凑单元。采用酸性介质中的藏红溶液对亚硝酸根进行了灵敏、选择性的测定。在酸性介质中，亚硝酸盐与藏红反应形成重氮盐，使溶液中的染料从红橙色变为蓝色。藏红溶液的吸光度与亚硝酸盐浓度有关，通过制造的光度计和525的流量检测器进行监测 nm。对水样进行了处理，以评估引入的系统和分析程序的有效性。获得了良好的分析性能，包括0.3至3的线性响应 mg/l亚硝酸盐（r = 0.9918），检测限为0.1 mg/l，相对标准偏差为4.24%（n = 10），使用建议的设置。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Instrumentation Science & Technology 工程技术-分析化学

CiteScore

3.50

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Instrumentation Science & Technology is an internationally acclaimed forum for fast publication of critical, peer reviewed manuscripts dealing with innovative instrument design and applications in chemistry, physics biotechnology and environmental science. Particular attention is given to state-of-the-art developments and their rapid communication to the scientific community. Emphasis is on modern instrumental concepts, though not exclusively, including detectors, sensors, data acquisition and processing, instrument control, chromatography, electrochemistry, spectroscopy of all types, electrophoresis, radiometry, relaxation methods, thermal analysis, physical property measurements, surface physics, membrane technology, microcomputer design, chip-based processes, and more. Readership includes everyone who uses instrumental techniques to conduct their research and development. They are chemists (organic, inorganic, physical, analytical, nuclear, quality control) biochemists, biotechnologists, engineers, and physicists in all of the instrumental disciplines mentioned above, in both the laboratory and chemical production environments. The journal is an important resource of instrument design and applications data.