Evaluation of nitrate quantification techniques for in-line analysis in drinking water
The potential of four analytical methods for the quantification of nitrate is determined to be used in a continuous sampling set up: ion chromatography and the ultraviolet spectrophotometric screening, both in their benchtop version, Cadmium reduction with post-reaction and visible light absorption...
| Autores Principales: | Hernández-Alpízar, Laura, Coy-Herrera, Ricardo |
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| Formato: | Artículo |
| Idioma: | Español |
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Editorial Tecnológica de Costa Rica
2015
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https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/2446 https://hdl.handle.net/2238/8228 |
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RepoTEC82282017-09-19T20:37:00Z Evaluation of nitrate quantification techniques for in-line analysis in drinking water Evaluación de técnicas de cuantificación de nitratos en agua potable para análisis en línea Hernández-Alpízar, Laura Coy-Herrera, Ricardo Nitrate; in-line analysis; FIA; continuos sampling; spectrophotometry. Nitratos; análisis en línea; FIA; muestreo continuo; espectrofotometría. The potential of four analytical methods for the quantification of nitrate is determined to be used in a continuous sampling set up: ion chromatography and the ultraviolet spectrophotometric screening, both in their benchtop version, Cadmium reduction with post-reaction and visible light absorption measurement and the direct ultraviolet spectrophotometric absorption screening but using mini-spectrophotometers and in flow injection of the sample and analysis (FIA) techniques. Accessories, toxicity of the reaction products, response, detection and quantification limits, linearity in the range of interest and sensitivity are considered for the evaluation. The direct measurement of ultraviolet absorption with flow injection was the best of the evaluated techniques. It has a linear response in the 0-10 mg/L range, WHO recommended range for drinking water, low reagents and accessories consuming, LOD 0,002 mg/L, LOQ 0,006 mg/L, and good sensitivity in the investigated range, meeting the required characteristics for in-line monitoring systems. En este artículo se presentan los resultados de un estudio para determinar el potencial uso de cuatro técnicas para la cuantificación de nitratos en muestreo continuo: cromatografía iónica, espectrofotometría de absorción ultravioleta utilizando un equipo de mesa y dos miniespectrofotómetros con inyección de la muestra en flujo continuo, uno para mediciones en el ámbito de radiación visible y el otro optimizado para mediciones de absorción de radiación ultravioleta. Las variables consideradas son el consumo de reactivos y accesorios, la toxicidad de los desechos, la respuesta al analito, el límite de detección (LD), el límite de cuantificación (LC), la linealidad en el ámbito de interés y la sensibilidad. La espectrofotometría de detección de absorción ultravioleta con inyección de la muestra en flujo continuo resultó ser la mejor de las técnicas evaluadas para análisis en línea; su respuesta es lineal entre 0-10 mg/L, que es el ámbito recomendado por la OMS para la concentración de nitratos en agua potable; tiene un bajo consumo de reactivos y accesorios, no genera residuos peligrosos, tiene LD 0,002 mg/L y LC 0,006 mg/L y una sensibilidad adecuada para responder rápidamente a la concentración del analito sin saturación de la señal, cumpliendo con las características deseables para un sistema de análisis en línea. 2015-12-11 2017-09-19T20:37:00Z 2017-09-19T20:37:00Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo revisado por pares https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/2446 10.18845/tm.v28i4.2446 https://hdl.handle.net/2238/8228 spa https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/2446/2232 Copyright (c) 2015 Revista Tecnología en Marcha application/pdf Editorial Tecnológica de Costa Rica Revista Tecnología en Marcha; Vol. 28, Núm. 4: Octubre-Diciembre 2015; pág. 86-93 2215-3241 0379-3982 |
| institution |
Tecnológico de Costa Rica |
| collection |
Repositorio TEC |
| language |
Español |
| topic |
Nitrate; in-line analysis; FIA; continuos sampling; spectrophotometry. Nitratos; análisis en línea; FIA; muestreo continuo; espectrofotometría. |
| spellingShingle |
Nitrate; in-line analysis; FIA; continuos sampling; spectrophotometry. Nitratos; análisis en línea; FIA; muestreo continuo; espectrofotometría. Hernández-Alpízar, Laura Coy-Herrera, Ricardo Evaluation of nitrate quantification techniques for in-line analysis in drinking water |
| description |
The potential of four analytical methods for the quantification of nitrate is determined to be used in a continuous sampling set up: ion chromatography and the ultraviolet spectrophotometric screening, both in their benchtop version, Cadmium reduction with post-reaction and visible light absorption measurement and the direct ultraviolet spectrophotometric absorption screening but using mini-spectrophotometers and in flow injection of the sample and analysis (FIA) techniques. Accessories, toxicity of the reaction products, response, detection and quantification limits, linearity in the range of interest and sensitivity are considered for the evaluation. The direct measurement of ultraviolet absorption with flow injection was the best of the evaluated techniques. It has a linear response in the 0-10 mg/L range, WHO recommended range for drinking water, low reagents and accessories consuming, LOD 0,002 mg/L, LOQ 0,006 mg/L, and good sensitivity in the investigated range, meeting the required characteristics for in-line monitoring systems. |
| format |
Artículo |
| author |
Hernández-Alpízar, Laura Coy-Herrera, Ricardo |
| author_sort |
Hernández-Alpízar, Laura |
| title |
Evaluation of nitrate quantification techniques for in-line analysis in drinking water |
| title_short |
Evaluation of nitrate quantification techniques for in-line analysis in drinking water |
| title_full |
Evaluation of nitrate quantification techniques for in-line analysis in drinking water |
| title_fullStr |
Evaluation of nitrate quantification techniques for in-line analysis in drinking water |
| title_full_unstemmed |
Evaluation of nitrate quantification techniques for in-line analysis in drinking water |
| title_sort |
evaluation of nitrate quantification techniques for in-line analysis in drinking water |
| publisher |
Editorial Tecnológica de Costa Rica |
| publishDate |
2015 |
| url |
https://revistas.tec.ac.cr/index.php/tec_marcha/article/view/2446 https://hdl.handle.net/2238/8228 |
| _version_ |
1796143143687553024 |
| score |
12.040382 |