Abstract
The solubility of BaSO4 in seawater with a salinity of 0.35–35‰ was experimentally determined. With an increase in salinity from 0.35 to 10‰, the equilibrium concentration of dissolved barium decreases from 42 to 28 μg/L, remains at the level of ~28 μg/L in the salinity range from 10 to 25‰, and increases to 30.7 μg/L at a salinity of 35‰. When the concentration of dissolved barium in river runoff is higher than 40–45 μg/L, BaSO4 can precipitate in the river–seawater mixing zone, most likely with the participation of living organisms. When the concentration of dissolved barium in river runoff is below 40–45 μg/L, an additional source in the river–seawater mixing zone can be dissolution of suspended BaSO4, but the presence of the latter in the composition of eroded terrigenous material is unlikely and has not been detected by direct observations.
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The study was carried out with the partial support of TSU under the program “Priorities 2030”.
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Savenko, A.V., Savenko, V.S. & Pokrovsky, O.S. Solubility of BaSO4 in Standard and Desalinated Seawater. Oceanology 63, 648–650 (2023). https://doi.org/10.1134/S0001437023050156
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DOI: https://doi.org/10.1134/S0001437023050156