Abstract
The status of the metals in the paddy husk which is a major agrowaste in India and other countries has been studied here from the points of view of environmental planning and utilization of this waste matter. Cu, Co, Ni, Pb, Zn, Cd, Mn, Fe, Ca, Mg, Na, K, Li, Sb and As were determined by atomic absorption spectrophotometry. Al was estimated spectrophotometrically, and SiO 2 gravimetrically. Cu, Co, Ni, Pb, Sb, As and Li were found to be below 10 ppm, Zn and Al below 25 ppm, Mn, Fe, Mg and Na below 200 ppm, Ca 213 ppm, K above 3000 ppm and Si above 9·4%. While Si is recoverable in semiconductor grade purity, K has its value as crop nutrient if the husk ash is applied to crop land. The uptake of some toxic metals (Cu, Co, Ni, Pb, Zn, Mn, Sb and As) by the paddy husk from the subsoil has also been indicated by the study.
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