Producción Científica Profesorado

Large?volume sample stacking with polarity switching for analysis of azo dyes in water samples by capillary electrophoresis



Camacho Mendoza, Rosa Luz

2019

J. Francisco Flores-Aguilar, Lorena C. Medrano, Emmanuel Perez-Escalante, Jose A. Rodriguez, Rosa L. Camacho-Mendoza & Israel S. Ibarra (2019) Large?volume sample stacking with polarity switching for analysis of azo dyes in water samples by capillary electrophoresis, International Journal of Environmental Analytical Chemistry, 99:13, 1255-1267, DOI: 10.1080/03067319.2019.1618461


Abstract


A simple, fast and efficient on-line pre-concentration method (large-volume sample stacking) by capillary electrophoresis was proposed for determination of azo dyes residues (allura red [AR], sunset yellow [SY] and tartrazine [TAR]) in water samples. Pre-concentration variables involved in the system were optimised using of a Box?Bhenken design. Under the optimal conditions: injection time 150.0 s, pre-concentration time 120.0 s and reverse potential ?8.0 kV, the proposed methodology improved the analytical sensibility achieving limits of detection of 21.0?41.4 g L?1 with enrichment factors of 82.1?210.8 fold. The large-volume sample stacking-capillary electrophoresis method was validated and applied to determine azo dyes residues in 20 water samples (bottled, spring and tap water). Two samples were positive for sunset yellow and tartrazine with a concentration of 25.3 and 30.2 g L?1 and % RSD less than 10.0% in all cases.



Producto de Investigación




Artículos relacionados

Structural differences in eight- and ten-membered heterocyclic tin compounds displaying transannular...

Hypervalence in germanium compounds containing the tetracylic moiety {S(C6H3S)2O}Ge via OGe transann...

cis-Palladium(II) complexes of derivatives of di-(2-pyridyl)methane: Study of the influence of the b...

Synthesis, Characterisation and Properties of As-Monohalogenated Dibenzoarsocines S(C6H4S)2AsHal (Ha...

Hypervalence at tin(IV) by transannular bonding of sulfur in an eight-membered ring: The case of dib...

Complexation of the uranyl ion (UO2)2+ with a tetraphenylimidodiphosphinate ligand: the first trinuc...

Five-membered ring chelate complexes of Ni(II), Pd(II) and Pt(II) derived of di-(2-pyridyl)-N-ethyli...

Pentacoordination at antimony in dibenzostibocines via DSb transannular interactions (D = O, S): A s...

Pentacoordination at Germanium by Transannular Bonding of Sulfur or Oxygen in an Eight-Membered Ring...

Synthesis, characterization and crystal structures of organolead dithiolate compounds displaying tra...