CHARACTERIZATION AND DISTRIBUTION PATTERN OF HEAVY METALS (Co, Ni & Pb) IN SOILS OF JHARKHAND
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Date
2008
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Birsa Agricultural University, Kanke, Ranchi, Jharkhand
Abstract
Surface and profile samples were collected from different locations and toposequences
covering three agro-climatic zones of Jharkhand viz. zone-IV (Baliapur, Jharia
& Dhanbad), zone-V (Bagru, Pakharpat, Kisko & Lohardaga) and zone-VI (Moshabani,
Jadugonda & Chandil). Total number of surface soil samples were 225 and 9 soil profiles,
were examined. Analyses of soil pH, organic carbon and calcium carbonate revealed that
content of these metals were maximum in lowland soils followed by midland and upland.
Soil pH in zone IV, V and VI ranged from 3.9-6.9, 5.0-6.7 and 4.0-6.6; organic carbon
varied from 3.6-10.5 g kg-1, 1.09-10.2 g kg-1 and 3.8-10.4 g kg-1 whereas CaCO3 0.1-1.0%,
0.1-1.0% and 0.2-1.0% respectively. DTPA-extractable cobalt, nickel and lead in zone-IV
were trace-2.08 mg kg-1, 0.06-2.5 mg kg-1 and 0.02-4.3 mg kg-1; in zone-V trace-1.3 mg kg-1,
0.06-2.2 mg kg-1and 0.62-2.22 mg kg-1 whereas in zone-VI trace-3.72 mg kg-1, 0.06-4.46 mg
kg-1 and 0.48-2.7 mg kg-1 respectively. Total content of cobalt, nickel and lead in zone-IV
were 72-163 mg kg-1, 147-472 mg kg-1 and 229-547 mg kg-1; in zone-V 61-141 mg kg-1, 122-
486 mg kg-1 and 177-711 mg kg-1 whereas in zone-VI 65-155 mg kg-1, 93-630 mg kg-1 and
173-662 mg kg-1 respectively. Higher amount of DTPA-extractable and total content of
cobalt, nickel and lead was observed in lowland against the different topo-sequences.
Profile study showed, soil pH and CaCO3 increased with increasing soil depth of profiles.
On contrary, organic carbon of the soils declined with increasing depth. Higher values of
CEC in subsurface horizons commensurate with the amount of clay. Comparatively less
amount of DTPA-extractable and total content of cobalt, nickel and lead were observed in
lower hprizons. DTPA-extractable cobalt, nickel and lead were highly negative and
significant correlation with soil pH while positive and significantly correlated with organic
carbon and clay content. A highly positive and significant correlation was found between
total content of cobalt, nickel and lead with organic carbon. The study of step wise multiple
regression equations showed more impact of soil pH, clay and organic carbon on available
of cobalt, nickel and lead than other soil parameters whereas in case of total content,
organic matter was important determining factor. Application of lime reduced the
availability of cobalt, nickel and lead with increasing incubation periods. Hence, lime
would be an effective amendment for the soils containing heavy metals (Co, Ni & Pb) in
this region.
Description
CHARACTERIZATION AND DISTRIBUTION PATTERN OF HEAVY METALS (Co, Ni & Pb) IN SOILS OF JHARKHAND
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