Department of Chemistry and Soil Science, G.B. Pant University of Agriculture and Technology, Pantnagar, 263145, Nainital, U.P.
*Present addresses: Department of Biochemistry and Microbiology, APAU, Rajendranagar, Hyderabad
**Present addresses: Potash Research Institute of India, Gurgaon, Haryana
***Present addresses: APAU, Rajendranagar, Hyderabad
Dissolution kinetics of four chlorite samples from Lower Siwalik area in foothills (Tarai) region of Nainital district of Uttar Pradesh and one from Ward's Natural Science Establishment gave very similar rates for the release of Fe2+ and Mg2+ in 0.1M HCl. Average first order rate constants for these are 9.1 × 10−2 h−1 and 1.8 × 10−2 h−1 at 30 and 40°C, respectively. Average activation energy calculated from Arrhenius equation is 12.2±1.0 k cal/mole. Dissolution studies indicated probable disturbances from interlayer, free oxides or other impurities which resulted in a much faster initial rate of release of these ions.
Dissolution kinetics, clay minerals, chlorites
