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Abstract
Silica gel H impregnated with microcrystalline cellulose gel in alkaline medium was used as a stationary phase for the thin layer chromatography of heavy metal cations. A mixture of 10% aqueous potassium thiocyanate and triton X-100 in 1:1 v/v has been identified as the best combination of mobile phase for achieving selective separation of cobalt from nickel. The efficacy of the chromatographic system has been investigated by monitoring reproducibility of RF values and spot compactness with respect to the change in sample concentration and matrix effect. The improved selectivity of impregnated silica gel H was expounded by SEM and FTIR studies. The typical surface modification as well as the chemical changes in impregnated silica gel H was attributed. Chromatograms of the cations were quantitatively evaluated by scanning densitometry in comparison with ICP elemental analysis. The proposed method is applied for the determination of cobalt and nickel cations in spiked samples of geological and industrial origin.
ACKNOWLEDGEMENTS
The authors thank Mr. C.S. Gundewar, Director JNARDDC for his constant encouragement, useful suggestions, and permission for publishing the work. Dr. Sishodia, Director, NIMH and Junior Scientific Officer, Mr. Nikhil Kulkarni are thanked for their support and aid for FTIR facilities for the research work. The Science and Technology Wing, Ministry of Mines, Government of India, is acknowledged for financial support to the project on the “Development of Rapid Analytical Procedures for Cobalt, Chromium and Nickel.”
Notes
Chromatographic system: S3-M10(1:1); Solvent ascent: 10 cm.
ICP: Inductively coupled plasma; OSD: Optical scanning densitometry; SD: Standard deviation; ERR: Error; *Each OSD value is average of five consecutive scanning of five different spots of same sample loaded on the TLC plate.