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Differential Pulse Polarographic Determination of Trace Amount of Bismuth in Various Complex Samples After Preconcentration of Its 1‐(2‐Pyridylazo)‐2‐naphthol Complex by Column and Microcrystalline Naphthalene Methods
Author(s) -
Taher Mohammad Ali,
Puri Bal Krishan
Publication year - 1999
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/(sici)1521-4109(199908)11:12<899::aid-elan899>3.0.co;2-e
Subject(s) - chemistry , polarography , bismuth , detection limit , analytical chemistry (journal) , adsorption , trace amounts , naphthalene , microcrystalline , hydrochloric acid , aqueous solution , chromatography , inorganic chemistry , medicine , alternative medicine , organic chemistry , pathology , crystallography
A differential pulse polarographic method has been developed for the determination of trace amount of bismuth in various complex samples after adsorption of its 1‐(2‐pyridylazo)‐2‐naphthol on naphthalene in the pH range 8.0–10.0. After filtration, the solid mass is shaken with 8 mL of 1 M hydrochloric acid, mixed with 2.0 mL of 1 M pyridine solution and determined with a differential pulse polarograph. It is reduced reversibly under these conditions. Alternatively, bismuth may be quantitatively adsorbed on [1‐(2‐pyridylazo)‐2‐naphthol]‐naphthalene adsorbent packed in a column and determined similarly. The detection limit is 20 ppb (signal to noise ratio: 2) and the linearity is maintained in the concentration range 80–16×10 4 ppb with a correlation coefficient of 0.9994 and relative standard deviation of ±0.96 %. Various parameters such as the effect of pH, aqueous phase volume and interference of a large number of metal ions on the determination of bismuth have been studied in detail. The method is found to be highly selective, rapid, economical and fairly sensitive and has been used for the determination of trace amount of bismuth in various complex samples.