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6942857 
Journal Article 
Selective extractions for trace element determination in black shales from Dehradun area 
Jain, AK; Pandey, A; Kumar, A; , 
2013 
Yes 
Journal of the Indian Chemical Society
ISSN: 0019-4522 
SCIENTIFIC PUBL-INDIA 
JODHPUR 
90 
11 
2043-2046 
English 
WOS:000209279800023 
The study focuses on the leaching of trace elements (Co, Cr, Cu, Mo, Ni, Pb, U, V and Zn) present in black shale in Loharka, Dehradun. Samples of non-weathered, weathered and burnt black shale were chemically characterized and the potential element release from these has been assessed by using standard water-based leaching tests and leaching using acids and oxidising agents. Chemical extractions provide further information on the phases wherein. elements are bound in shale samples. Results show that the shale samples analysed are rich in Ni (50-300 ppm), Cu (10-150 ppm), Mo (64-500 ppm), U (40-70 ppm), Zn (20-300 ppm) and V (100-2300 ppm), respectively. Mo bound mainly in sulphides or organic matter is very labile (20% leachability) with water as extractant. Co and Zn are leached completely with acids and per-oxodisulphate. The overall conclusion is that black shale shows a high potential for releasing Cu, Mo, Ni, U, V and Zn during weathering. The leaching of trace elements using different extractants under different conditions give complete recovery and therefore can be adopted as fast and rapid analytical methodology for the determination of these trace elements. 
Black shale; leaching of trace elements; microwave digestion; ICP-OES; AAS