Premium
Aluminum Speciation with Adsorptive Pyrocatechol Violet‐Al(III) Complex by Derivative Adsorption Chronopotentiometry
Author(s) -
Wang Xianlong,
Bi Shuping,
Gan Ning,
Wei Zongbo
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200110)13:15<1279::aid-elan1279>3.0.co;2-8
Subject(s) - chemistry , monomer , hanging mercury drop electrode , adsorption , stripping (fiber) , fractionation , genetic algorithm , derivative (finance) , mercury (programming language) , electrochemistry , nuclear chemistry , inorganic chemistry , voltammetry , chromatography , electrode , organic chemistry , evolutionary biology , electrical engineering , biology , engineering , polymer , computer science , financial economics , economics , programming language
An electrochemical procedure is proposed for the speciation of aluminum (Al) by derivative adsorption chronopotentiometry on a hanging mercury drop electrode (HMDE) using pyrocatechol violet (PCV) as a complexing agent. Labile monomeric Al fraction (mainly inorganic Al) was determined at pH 4.9 (accumulation time 60 s, accumulation potential −0.45 V, PCV concentration 1.5×10 −6 mol dm −3 and stripping current 5 μA), while total monomeric Al fraction was determined at pH 8.2 (accumulation time 60 s, accumulation potential −0.50 V, PCV concentration 2.5×10 −6 mol dm −3 and stripping current 5 μA). This sensitive and simple fractionation method was successfully applied to the speciation of Al in natural water samples. Five fractions were determined and measured: i) labile monomeric Al ( Ali ); ii) total monomeric Al ( Ala ); iii) acid reactive Al ( Alr ); iv) nonlabile monomeric Al ( Alo ); v) acid soluble Al ( Als ). The results were satisfactorily in agreement with those of the 8‐hydroxyquinoline extraction/ion exchange method.