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Determination of food additive azo dyes at an HMDE with adsorptive stripping voltammetry
Author(s) -
Castrillejo Yolanda,
Pardo Rafael,
Barrado Enrique,
Batanero Pedro Sánchez
Publication year - 1990
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140020709
Subject(s) - hanging mercury drop electrode , chemistry , adsorptive stripping voltammetry , stripping (fiber) , supporting electrolyte , voltammetry , adsorption , chromatography , electrolyte , triarylmethane dye , nuclear chemistry , electrode , inorganic chemistry , electrochemistry , organic chemistry , materials science , composite material
Controlled adsorptive accumulation of the food additives (azo dyes) ponceau 4R, Allura Red, and carmoisine at a hanging mercury drop electrode (HMDE) provided the basis for their determination by stripping voltammetry at nanomolar concentration levels. The adsorptive stripping response was evaluated with respect to experimental parameters such as accumulation potential, preconcentration time, pH, and bulk concentration. Best results were obtained using an ammonia buffer as the supporting electrolyte; depending on the dye, detection limits of 0.071, 0.076, and 0.043 nM were, respectively, achieved in pure dye solutions. The simultaneous determination was carried out by means of the generalized standard addition method.