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4 results on '"Marinho, Marciel Vaz"'

3. Mixture design of an electrolyte system for the simultaneous separation of Cl−, SO42−, NO3−, NO2−, and HCO3−in shrimp-farming water by CZE-UVElectronic supplementary information (ESI) available: Electropherogram of the solution containing 250 mg L−1of Cl−, SO42−, NO3−and NO2−, RSD values for repeatability test and measured viscosity (η) for BGEs used in mixture design (DOC). See DOI: https://doi.org/10.1039/d2ay01619b

Author

do Nascimento, Maria Patrícia, Marinho, Marciel Vaz, Sousa, Rafael Arromba de, and Leal de Oliveira, Marcone Augusto

Abstract

Shrimp is one of the most traded fishery products in the world. The shrimp-farming water ionic composition is fundamental to the growth and survival of these specimens. Therefore, this study is aimed to develop a method for the simultaneous separation of Cl−, SO42−, NO3−, NO2−, and HCO3−in this sample by capillary zone electrophoresis with UV indirect detection, without any prior sample treatment, besides dilution. The background electrolyte (BGE) was composed of CrO42−(60 mmol L−1), cetyltrimethylammonium bromide (CTAB, 2.5 mmol L−1), acetonitrile (0.875% (v/v)), and methanol (2.625% (v/v)). The mixture design optimized the BGE composition. Acetonitrile and methanol changed the degree of solvation of the anions, which decreased the radius, a phenomenon proven by calculating the radius of anions in all the conditions of the mixture design. The optimized and validated method allowed the simultaneous determination of the five above-mentioned anions in 10 min.

Published
2023
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4. Mixture design of an electrolyte system for the simultaneous separation of Cl - , SO 4 2- , NO 3 - , NO 2 - , and HCO 3 - in shrimp-farming water by CZE-UV.

Author

do Nascimento MP, Marinho MV, Sousa RA, and Leal de Oliveira MA

Subjects
Methanol, Electrolytes, Anions analysis, Agriculture, Nitrogen Dioxide, Water
Abstract

Shrimp is one of the most traded fishery products in the world. The shrimp-farming water ionic composition is fundamental to the growth and survival of these specimens. Therefore, this study is aimed to develop a method for the simultaneous separation of Cl - , SO 4 2- , NO 3 - , NO 2 - , and HCO 3 - in this sample by capillary zone electrophoresis with UV indirect detection, without any prior sample treatment, besides dilution. The background electrolyte (BGE) was composed of CrO 4 2- (60 mmol L -1 ), cetyltrimethylammonium bromide (CTAB, 2.5 mmol L -1 ), acetonitrile (0.875% (v/v)), and methanol (2.625% (v/v)). The mixture design optimized the BGE composition. Acetonitrile and methanol changed the degree of solvation of the anions, which decreased the radius, a phenomenon proven by calculating the radius of anions in all the conditions of the mixture design. The optimized and validated method allowed the simultaneous determination of the five above-mentioned anions in 10 min.

Published
2023
Full Text
View/download PDF

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