Ion balance in waters through inductively coupled plasma optical emission spectrometry

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Title: Ion balance in waters through inductively coupled plasma optical emission spectrometry
Authors: Sánchez, Carlos | Maestre, Salvador E. | Prats Moya, Soledad | Todolí Torró, José Luis
Research Group/s: Análisis de Alimentos | Análisis de Polímeros y Nanomateriales
Center, Department or Service: Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología
Keywords: Bicarbonate | Chloride | Drinking water | Fish farm water | Inductively coupled plasma optical emission spectrometry | Ion balance | Sulfate
Knowledge Area: Nutrición y Bromatología | Química Analítica
Issue Date: 2014
Publisher: Taylor & Francis
Citation: International Journal of Environmental Analytical Chemistry. 2014, 94(5): 427-440. doi:10.1080/03067319.2013.853762
Abstract: Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) has been employed to carry out the determination of both major anions and cations in water samples. The anion quantification has been performed by means of a new automatic accessory. In this device chloride has been determined by continuously adding a silver nitrate solution. As a result solid silver chloride particles are formed and retained on a nylon filter inserted in the line. The emission intensity is read at a silver characteristic wavelength. By plotting the drop in silver signal versus the chloride concentration, a straight line is obtained. As regards bicarbonate, this anion has been on-line transformed into carbon dioxide with the help of a 2.0 mol L−1 nitric acid stream. Carbon signal is linearly related with bicarbonate concentration. Finally, information about sulfate concentration has been achieved by means of the measurement of sulfur emission intensity. All the steps have been simultaneously and automatically performed. With this setup detection limits have been 1.0, 0.4 and 0.09 mg L−1 for chloride, bicarbonate and sulfate, respectively. Furthermore, it affords good precision with RSD below 6 %. Cation (Ca, Mg, Na and K) concentration, in turn, has been obtained by simultaneously reading the emission intensity at characteristic wavelengths. The obtained limits of detection have been 8 × 10−3, 2 × 10−3, 8 × 10−4 and 10−2 mg L−1 for sodium, potassium, magnesium and calcium, respectively. As regards sample throughput, about 30 samples h−1 can be analysed. Validation results have revealed that the obtained concentrations for these anions are not significantly different as compared to the data provided by conventional methods. Finally, by considering the data for anions and cations, precise ion balances have been obtained for well and mineral water samples.
ISSN: 0306-7319 (Print) | 1029-0397 (Online)
DOI: 10.1080/03067319.2013.853762
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 Taylor & Francis
Peer Review: si
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Appears in Collections:INV - AAQCN - Artículos de Revistas
INV - NANOBIOPOL - Artículos de Revistas

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