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Cathodic Action of the Metal Complexes at the Dropping Mercury Electrode. VII. Lead‐Ascorbate Complex
Author(s) -
Lai TsaiTeh,
Wang BiCheng
Publication year - 1962
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.196200018
Subject(s) - chemistry , polarography , ascorbic acid , chelation , dropping mercury electrode , inorganic chemistry , metal , mercury (programming language) , metal ions in aqueous solution , cathodic protection , electrode , ion , diffusion , nuclear chemistry , electrochemistry , organic chemistry , physics , food science , computer science , thermodynamics , programming language
The polarographic characteristics of the chelate formed between lead ion and ascorbic acid have been studied over a p H range of 2.0 to 5.8. The reversible reduction was held over a wide range of the concentration of the chelating agent varying from 0.132 M to 1.0 M when pH value was lower than 5.8. The higher the concentration of ascorbic acid, the more hydroxylion was involved in the reduction of the polarographic solution of the same p H value. At p H 2.5 to 5.8 the existence of a mixture of more than one kind of chelate species was found. The diffusion current was found to be proportional to lead ion concentration from 0.2 mM to 2.0 mM with 1.4% average deviation.