Selective Monitoring of Oxyanion Mixtures by a Flow System with Raman Detection
AbstractRaman spectroscopy is a selective detection system scarcely applied for the flow analysis of solutions with the aim of detecting several compounds at once without a previous separation step. This work explores the potential of a portable Raman system in a flow system for the selective detection of a mixture of seven oxyanions (carbonate, sulphate, nitrate, phosphate, chlorate, perchlorate, and thiosulphate). The specific bands of these compounds (symmetric stretching Raman active vibrations of carbonate at 1068 cm−1, nitrate at 1049 cm−1, thiosulphate at 998 cm−1, phosphate at 989 cm−1, sulphate at 982 cm−1, perchlorate at 935 cm−1, and chlorate at 932 cm−1) enabled their simultaneous detection in mixtures. Although the oxyanions’ limit of detection (LOD) was rather poor (in the millimolar range), this extremely simple system is very useful for the single-measurement detection of most of the oxyanions in mixtures, without requiring a previous separation step. In addition, quantitative determination of the desired oxyanion can be performed by means of the corresponding calibration line. These are important advantages for controlling in-line processes in industries like those manufacturing fertilizers, pharmaceuticals, chemicals, or food, among others. View Full-Text
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Zapata, F.; Ortega-Ojeda, F.; García-Ruiz, C.; González-Herráez, M. Selective Monitoring of Oxyanion Mixtures by a Flow System with Raman Detection. Sensors 2018, 18, 2196.
Zapata F, Ortega-Ojeda F, García-Ruiz C, González-Herráez M. Selective Monitoring of Oxyanion Mixtures by a Flow System with Raman Detection. Sensors. 2018; 18(7):2196.Chicago/Turabian Style
Zapata, Félix; Ortega-Ojeda, Fernando; García-Ruiz, Carmen; González-Herráez, Miguel. 2018. "Selective Monitoring of Oxyanion Mixtures by a Flow System with Raman Detection." Sensors 18, no. 7: 2196.
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