Net effect of chemical erosion in a tropical basin (Mahanadi river, India) on carbon cycle: Constraints using water chemistry and δ34S
Description
We present new time-series chemical and sulfur isotopic data for one of the distributaries (Paika river) for the Mahanadi river (India). The chemical data include major cations (Na, K, Ca, and Mg), anions (HCO3, Cl, SO4, and NO3), and silica concentrations for the water samples, which are collected at weekly intervals over a duration of 15 months (August 2019 to October 2020). In addition, this element also includes major ions data for rain and groundwater samples from the lower reaches of the basin.
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Geochemical analyses of the water samples were carried out following our established analytical protocols (Tripathy et al., 2019; Samanta et al., 2019). The major cations and anions concentrations were measured using an Ion chromatograph instrument (Metrohm compact IC plus 882). The water alkalinity was measured using an auto-titrator (Metrohm Titrino plus 877) and dissolved silica by a spectrophotometer (Evolution 300, Thermo Scientific). The accuracy and precision of these data were constrained by measuring standards of known concentrations, and measuring samples in replicates, respectively. The dissolved sulfur isotopes of the riverine sulfate were measured using an isotope ratio mass spectrometer (Elementar-isoprime precisION) instrument. For this, we have used the analytical methodology suggested by the USGS (https://www.usgs.gov) with minor modifications. The δ34S data for reference materials (sulfanilamide and BaSO4) were constantly monitored to check for data quality.