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

Synthesis and Spectroelectrochemical Studies of Mixed Heteroleptic Chelate Complexes of Ruthenium(II...

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

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

Synthesis and Crystal Structure of [Te{S(C6H3S)2O}]: A Tetracyclic Tellurium(II) Compound Displaying...

Synthesis and crystal structure of the N-8-(diphenyl-hydroxy-2-aminomethylpyridine)borane

Ni(II) and Pd(II) organometallic and coordination complexes with a new tridentate N,N,O-donor ligand...

Six-membered ring chelate complexes of Pd(II) and Pt(II) derived from di-(2-pyridyl)pyrimidin-2-ylsu...

Synthesis, characterization and crystal structures of dipyridyl-N-methylimine and cloro-bis (N,N?-2,...

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

Study of the D?Sb (D = O, S) Transannular Interaction in Sb-Monohalogenated Dibenzostibocines ? An E...