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Combining Alkaline Extraction and in Situ Plated Bismuth Film for Reliable Quantification of Zn in Multivitamin Formulations
Author(s) -
Fonseca Wilson T.,
Takeuchi Regina M.,
Santos André L.
Publication year - 2015
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.201500038
Subject(s) - multivitamin , bismuth , extraction (chemistry) , anodic stripping voltammetry , voltammetry , aqueous solution , square wave , chemistry , in situ , matrix (chemical analysis) , stripping (fiber) , glassy carbon , electrode , chromatography , materials science , analytical chemistry (journal) , inorganic chemistry , cyclic voltammetry , electrochemistry , metallurgy , biochemistry , physics , organic chemistry , voltage , quantum mechanics , composite material , vitamin
In this work a bismuth film electrode (BiFE) plated in situ onto glassy carbon was used to quantify Zn 2+ in multivitamin formulation samples by square wave anodic stripping voltammetry. For partially water‐soluble multivitamin tablets, an alkaline extraction with 1.0 mol L −1 NaOH aqueous solution was adopted. This procedure was simple, fast and efficient to extracting Zn from sample matrix. Moreover, this procedure was able to make the method less susceptible to interferences from Cu 2+ , since it remains at extracting vessel as insoluble Cu(OH) 2 . For fully water‐soluble effervescent tablets, sample pretreatment was not required.