Browsing by Author "Chakraborty, P."
Now showing items 1-20 of 49
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A multi-method approach for the study of lanthanum speciation in coastal and estuarine sediments
Chakraborty, P.; Babu, P.V.R.; Sarma, V.V. (Elsevier, 2011)Two independent analytical methods (sequential extraction and kinetic extraction methods) were applied in order to understand the distribution and speciation of La in the coastal and estuarine sediments from the central ... -
A new spectrofluorometric method for the determination of total arsenic in sediments and its application to kinetic speciation
Chakraborty, P.; RaghunadhBabu, P.V.; Sarma, V.V. (Taylor & Francis, 2012)A simple and sensitive spectrofluorometric method has been developed for the determination of arsenic (As) using rhodamine-B as a fluorescent agent. This method is based on the reaction of As(III) with potassium iodate ... -
A study of lead and cadmium speciation in some estuarine and coastal sediments
Chakraborty, P.; Babu, P.V.R.; Sarma, V.V. (Elsevier, 2012)Chemical speciation of lead (Pb) and cadmium (Cd) in the coastal and estuarine sediments along the central east coast of India was studied by applying sequential and kinetic extraction methods. The results of this study ... -
Accumulation of humic acid in DET/DGT gels
Van der Veeken, P.L.R.; Chakraborty, P.; Van Leeuwen, H.P. (American Chemical Society, 2010)Gel layer based sensors are increasingly employed for dynamic trace metal speciation analysis in aquatic and soil media. In DGT (Diffusive Gradient in Thin film), polyacrylamide hydrogels are commonly used for the diffusive ... -
An insight into mercury reduction process by humic substances in aqueous medium under dark condition
Vudamala, K.; Chakraborty, P.; Sailaja, B.B.V. (Springer, 2017)Mercury (Hg) reduction by humic substances (HS) in the aquatic medium under the dark condition is a poorly understood but important process in Hg biogeochemical cycling. In this study, an effort was made to provide a better ... -
Biochemical responses of oysters in evaluating environmental quality of tropical Indian estuarine systems
Patra, P.; Mohandass, C.; Chakraborty, P.; Seleyi, S.C. (Elsevier, 2021)Impact of varying concentrations and counts of toxic metals and indigenous bacteria on antioxidative defense system in edible oyster, Saccostrea cucullata, collected from four tropical estuarine systems of Goa (west coast ... -
Changes in metal contamination levels in estuarine sediments around India – An assessment
Chakraborty, P.; Ramteke, D.; Chakraborty, S.; Nath, B.N. (Elsevier, 2014)This review is the first attempt to comprehend the changes in metal contamination levels in surface estuarine sediments with changing time around India. Contamination factor, geoaccumulation index, pollution load index, ... -
Chemical characterization of meltwater from East Rathong glacier vis-a-vis Western Himalayan glaciers
Sharma, B.M.; Tayal, S.; Chakraborty, P.; Bharat, G.K. (Springer, 2015)Ice and meltwater samples from Rathong glacier and its pro-glacial stream Rathong chu, were collected during late winter season. Samples were analyzed to study the chemical composition , weathering, and geochemical processes ... -
Chromium speciation in the sediments across the oxygen minimum zone, western continental margin of India
Chakraborty, P.; Jayachandran, S.; Chakraborty, S. (2019)This study suggests that varying concentration of dissolved oxygen of overlying bottom water influences geochemical fractionation, speciation, and oxidation state of sedimentary Cr in a marine system. The nature of sedimentary ... -
Copper and nickel speciation in mine effluents by combination of two independent techniques
Chakraborty, P.; Zhao, J.; Chakrabarti, C.L. (Elsevier, 2009)To control potentially toxic metals in water resources it is necessary to know metal speciation and changes in the metal speciation that occur after aqueous effluents containing metals are discharged into freshwaters. This ... -
Determination of dynamic metal complexes and their diffusion coefficients in the presence of different humic substances by combining two analytical techniques.
Chakraborty, P.; Manek, A.; Niyogi, S.; Hudson, J. (Taylor & Francis, 2014)The combined use of a competing ligand exchange (CLE) method and a diffusive gradient in thin films (DGT) technique in a quasi-labile system provides a better understanding of dynamic metal (Cu and Ni) complexes in the ... -
Distribution and geochemical fractionation of lead in the continental shelf sediments around India
Chakraborty, S.; Chakraborty, P.; Sarkar, Arindam; Kazip, A.; Mascarenhas-Pereira, M.B.L.; Nath, B.N. (2019)This study provides the first, preliminary data on geochemical distribution and fractionation of Pb (a toxic heavy metal) in continental shelf sediments around India and identifies the factors that control geochemical ... -
Distribution and nature of sedimentary organic matter in a tropical estuary: An indicator of human intervention on environment
Sarkar, Arindam; Chakraborty, P.; Nath, B.N. (Elsevier, 2016)Sediment texture controls the spatial distribution of sedimentary organic matter (SOM) in the Vembanad Lake. Influences of marine derived organic matter (OM) on SOM decreased inner-wards in the northern part of the lake. ... -
Distribution, provenance and early diagenesis of major and trace metals in sediment cores from the Mandovi estuary, western India
Prajith, A.; Rao, V.P.; Chakraborty, P. (Elsevier, 2016)Major elements and trace metals were analyzed in four sediment cores recovered along a transect in the Mandovi estuary for their distribution, provenance and early diagenesis. The sediments were clayey silts in cores from ... -
Effect of pH on transport and transformation of Cu-sediment complexes in mangrove systems
Jayachandran, S.; Chakraborty, P.; Ramteke, D.; Chennuri, K.; Chakraborty, S. (Elsevier, 2018)Impact of pH variation of overlying water column on transport and transformation of Cu-sediment complexes in the bottom mangrove sediments was investigated by using different metal extraction studies. The total Cu concentration ... -
Effects of bottom water dissolved oxygen variability on copper and lead fractionation in the sediments across the oxygen minimum zone, western continental margin of India
Chakraborty, P.; Chakraborty, S.; Jayachandran, S.; Madan, R.; Sarkar, Arindam; Linsy, P.; Nath, B.N. (Elsevier, 2016)This study describes the effect of varying bottom-water oxygen concentration on geochemical fractionation (operational speciation) of Cu and Pb in the underneath sediments across the oxygen minimum zone (Arabian Sea) in ... -
Effects of bottom water oxygen concentrations on mercury distribution and speciation in sediments below the oxygen minimum zone of the Arabian Sea
Chakraborty, P.; Mason, R.P.; Jayachandran, S.; Vudamala, K.; Armoury, K.; Sarkar, Arindam; Chakraborty, S.; Bardhan, P.; Naik, R. (Elsevier, 2016)This study investigated the influences of varying dissolved oxygen (DO) levels in overlying bottom water, sediment grain size, total sedimentary organic carbon (C<sub>org</sub>), and total sedimentary sulfide concentrations ... -
Environmental controls on the speciation and distribution of mercury in surface sediments of a tropical estuary, India
Chakraborty, P.; Babu, P.V.R. (Elsevier, 2015)Distribution and speciation of mercury (Hg) in the sediments from a tropical estuary (Godavari estuary) was influenced by the changing physico-chemical parameters of the overlying water column. The sediments from the ... -
Estuarine and marine geology (2011-2015)
Rao, V.P.; Chakraborty, P. (Proceedings of the Indian National Science Academy, 2016)The estuaries of the Mandovi and Zuari (Ma-Zu) Rivers and Godavari River have been investigated extensively for understanding the sedimentary and bio-geochemical processes during the last 5 years. Estuarine turbidity maximum ... -
Fate of copper complexes in hydrothermally altered deep-sea sediments from the Central Indian Ocean Basin.
Chakraborty, P.; Sander, S.G.; Jayachandran, S.; Nath, B.N.; Nagaraju, G.; Chennuri, K.; Vudamala, K.; Lathika, N.; Mascarenhas-Pereira, M.B.L. (Elsevier, 2014)The current study aims to understand the speciation and fate of Cu complexes in hydrothermally altered sediments from the Central Indian Ocean Basin and assess the probable impacts of deep-sea mining on speciation of Cu ...