Simultaneous Determination of Cadmium and Lead in Real and Environmental Samples by Differential Pulse Polarography after Adsorption of Their 2-Nitroso-1-naphthol-4-sulfonic acid–Tetradecyldimethylbenzylammonium Ion-Associated Complex on Microcrystalline Naphthalene
✍ Scribed by Mohammad Ali Taher; Bal Krishan Puri; R.K. Bansal
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 101 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0026-265X
No coin nor oath required. For personal study only.
✦ Synopsis
Cadmium and lead form 2-nitroso-1-naphthol-4-sulfonic acid-tetradecyldimethylbenzylammonium ion-associated complexes which are quantitatively adsorbed on microcrystalline naphthalene in the pH ranges 5.7-11.0 and 8.0-10.5, respectively. After filtration, the solid mass is shaken with 10 ml of 1 M hydrochloric acid and these metals are determined simultaneously by differential pulse polarography. The detection limits are 0.09 mg/ml for Cd and 0.10 mg/ml for Pb (signal-to-noise ratio Å 2). Linearity is maintained in the concentration ranges 0.2-170 mg/ ml for Cd and 0.3-270 mg/ml for Pb, with a correlation coefficient of 0.9996 and relative standard deviations of {0.95 and {0.90%, respectively. Various parameters such as the effect of pH, volume of the aqueous phase, and interference of a number of metal ions on the determination of cadmium and lead have been studied in detail to optimize the conditions for the simultaneous (based on the difference in their E p values) determination of cadmium and lead in complex materials.