The novel Outer Plug Standardization (OPS) calibration strategy applied in a new method for the high-throughput determination of Cl - , NO 3 - and SO 4 -2 in rainwater samples.

Autor: Vieira VD; Department of Chemistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil., Dos Santos ON; Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil., Botelho IA; Department of Chemistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil., Vieira CMS; Department of Chemistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil., Alves VR; Department of Chemistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil., Hoinaski L; Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil. Electronic address: leonardo.hoinaski@ufsc.br., Micke GA; Department of Chemistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil. Electronic address: gustavo.micke@ufsc.br.
Jazyk: angličtina
Zdroj: Talanta [Talanta] 2021 Dec 01; Vol. 235, pp. 122820. Date of Electronic Publication: 2021 Aug 23.
DOI: 10.1016/j.talanta.2021.122820
Abstrakt: This paper presents the Outer Plug Standardization - OPS, a novel technique as an alternative for the classic internal standardization using multiple injection in capillary zone electrophoresis is proposed herein. This technique was applied in a new method for the determination of chloride, nitrate and sulfate in rainwater samples. After the injection accuracy was tested and proved to be a minor error source (average 1.26% RSD), the OPS was applied and it improved the intra-day and inter-day precision of the analytical method by 32.5% and 24.7%, respectively. Using a capillary with effective length of 23.5 cm the electrophoretic separation of the three inorganic anions could be achieved in <1 min, with detection limits of 0.05, 0.09 and 0.11 mg L -1 for chloride, nitrate and sulfate, respectively. Also, the statistical t-test was applied to the results obtained for 82 rainwater samples that were collected and analyzed applying both the method developed in this study and the official APHA 4140 method where no statistical difference was noted within a 95% confidence level.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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