Abstract
The paper suggests an accurate approach to studying carbonate equilibrium in the water of the Razdol’naya River. The approach involves measuring pH by Pitzer’s scale, using a cell without liquid junction; measuring the total alkalinity by Bruevich’s technique; and using apparent constants of carbonate equilibrium with regard for the organic alkalinity. The Pitzer technique was employed to calculate the apparent constants of carbonate equilibrium in solution that models the riverine water: Ca(HCO3)2–NaCl–H2O within the range of alkalinity of 0–0.005 mol/kg and temperatures of 0–25°C. Carbonate equilibrium in the water of the Razdol’naya River was sampled for studying at eight sites during all four seasons. Although the contents of biogenic compounds in the water are high, they can merely insignificantly affect the acid–base equilibrium, which is controlled in the riverine water by carbonate equilibrium and the concentrations of humic substances, which play the greater role, the greater the discharge of the river. In addition to the production and destruction of organic matter, carbonate equilibrium in the river is also affected by the supply of humic substances with soil waters and total alkalinity with groundwaters. The fluxes of alkalinity and humic substances annually brought by the Razdol’naya River to Amur Bay are evaluated at 1.33 × 109 mol and 9.9 × 106 kgC, respectively. The carbon dioxide export with the Razdol’naya River is equal to the alkalinity flux and does not depend on the weathering mechanisms.
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Original Russian Text © P.Ya. Tishchenko, T.A. Mikhailik, G.Yu. Pavlova, P.P. Tishchenko, A.M. Koltunov, Jing Zhang, 2017, published in Geokhimiya, 2017, No. 3, pp. 236–248.
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Tishchenko, P.Y., Mikhailik, T.A., Pavlova, G.Y. et al. Carbonate equilibrium in the water of the Razdol’naya River. Geochem. Int. 55, 282–293 (2017). https://doi.org/10.1134/S0016702917030089
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DOI: https://doi.org/10.1134/S0016702917030089