Enrichment of heavy metals in paddy crops irrigated by paper mill effluents near Nanjangud, Mysore District, Karnatake, India

Fazeli, M. S. and Khosravan, F. and Hossini, M. and Sathyanarayan, S. and Satish, P. N. (1998) Enrichment of heavy metals in paddy crops irrigated by paper mill effluents near Nanjangud, Mysore District, Karnatake, India. ENVIRONMENTAL GEOLOGY, 34 (4). pp. 297-302. ISSN 0943-0105

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Official URL: http://dx.doi.org/10.1007/s002540050281

Abstract

Extensive irrigation by the effluents released from a paper mill near Nanjangud have led to the accumulation of heavy metals in the soil and different parts of the paddy crops. In this paper, the physicochemical characteristics of paper mill effluents and the accumulation of heavy metals (Cu, Zn, Pb, Co, Cd, Cr, and Ni) in the soil and different parts (roof, leaf, and seed) of the paddy crops growing in the irrigated area are described and compared with the soil and paddy crops irrigated by natural waters (unpolluted). Chemical and biological oxygen demands of wastewater were found to be 437 and 1070 ppm respectively, which are beyond the tolerance limits set by Indian standards. The total dissolved and suspended solids are 1754 and 990 ppm respectively. The concentration of heavy metals (except Zn) in the seeds is remarkably less than that in the roots and leaves of the paddy crops. The heavy metal uptake by plants shows the greatest accumulation of Cu, Cr, Co, and Pb in the roots: Cd and Ni in the leaves; and Zn in the seeds of rice. The heavy metal content of the soil and their total uptake by paddy roots has the relation: Pb > Zn > Cu > Cd and Pb > Cu > Zn > Cd. Survival of paddy crops irrigated by polluted waters indicates tolerance to toxic heavy metals. In conclusion, since in many tropical countries the common diet of people is rice, the accumulation of toxic heavy metals in rice may lead to health disorders.

Item Type: Article
Additional Information: Unmapped bibliographic data: DA - 1998/06// [EPrints field already has value set] LA - English [Field not mapped to EPrints]
Uncontrolled Keywords: biomass, heavy metals, paddy crops, soil
Subjects: Physical Sciences > Earth Science
Divisions: PG Campuses > Manasagangotri, Mysore > Earth Science
Depositing User: Users 20 not found.
Date Deposited: 08 May 2013 11:00
Last Modified: 18 Nov 2015 09:20
URI: http://eprints.uni-mysore.ac.in/id/eprint/8854

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