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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(1) [January 2005] >
| Title: | Application of 2-nitroso-1-naphthol-4-sulphonic acid for separation and preconcentration of trace cadmium and determination by differential pulse polarography |
| Authors: | Taher, Mohammad Ali
Mobarakeh, Sayed Ziae Mohammadi
Mahani, Fatameh Saber |
| Keywords: | Differential pulse polarography
cadmium determination
standard alloys
biological samples
2-nitroso-1- naphthol-4-sulphonic acid. |
| Issue Date: | Jan-2005 |
| Publisher: | CSIR |
| IPC Code: | G01N 27/48 |
| Abstract: | A highly
selective, sensitive, rapid and economical differential pulse polarographic
method has been developed for the determination of trace amount of cadmium in
various standard alloys and biological samples after adsorption of its
2-nitroso-1-naphthol-4-sulphonic acid - tetradecyldimethylbenzylammonium
chloride on microcrystalline naphthalene in the pH range of 5.7-11.0. After filtration,
the solid mass is shaken with 9.0 mL of 1 M hydrochloric acid and cadmium is
determined by differential pulse polarography (DPP). Cadmium can alternatively
be adsorbed on 2-nitroso-1-naphthol-4-sulphonic
acid-tetradecyldimethylbenzylammonium-naphthalene adsorbent packed in a column
and determined. In this case, 0.9 mg of cadmium can be concentrated in a column
from 300 mL of aqueous sample, where its concentration is as low as 3 ng/mL.
Characterization of the electroactive process included an examination of the
degree of reversibility. Various parameters such as the effect of pH, volume of
aqueous phase, HCl concentration, reagent concentration, naphthalene concentration,
shaking time and interference of a number of metal ions on the determination of
cadmium have been studied in detail to optimize the conditions for
determination in standard alloys and standard biological samples. |
| Page(s): | 12-18 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(1) [January 2005]
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