Kinetic and equilibrium based fractionation study of Pb in continental shelf sediment of India

Chakraborty, Sucharita; Chakraborty, Parthasarathi; Sarkar, Arindam; Nagender Nath, B.

Kinetic and equilibrium based fractionation study of Pb in continental shelf sediment of India

2017

Chakraborty, Sucharita | Chakraborty, Parthasarathi | Sarkar, Arindam | Nagender Nath, B.

Two independent analytical methods (kinetic and sequential extraction protocols) were used to understand the distribution, stability, and lability of Pb-sediment complexes in Indian continental shelf. The concentrations of sedimentary Pb varied from 12.0±0.6 to 30.4±0.1mg·kg−1 and 15.9±0.3 to 36.7±0.4mg·kg−1 in the western and eastern shelf of India respectively. The kinetic extraction study showed that higher proportion of labile Pb-complexes were present in the eastern shelf sediments (~24% of total Pb) than the western shelf sediments (~14% of total Pb). The sedimentary organic matter was found to regulate lability of sedimentary Pb complexes. The sequential extraction study suggested that Fe/Mn oxyhydroxide were the primary hosting phase for labile Pb complexes. This study showed that water soluble, exchangeable, carbonate/bicarbonate-Pb complexes in the sediments was labile. This study provides a better physicochemical description of stability or lability of Pb complexes in the coastal sediment of India.

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