Abstract

Barium sulfate solubility in diluted Na₂SO₄–NaNO₃ solutions and seawater of 35‰ salinity at 22°C was studied in experiments. The value obtained for the thermodynamic solubility product of barium sulfate was \(L_{{{\text{BaSO}}_{4}^{0}}}^{0}\) = (7.57 ± 0.87) × 10^–11. It was shown that equilibrium concentration of dissolved barium in seawater was 30.7 μg/L and the water mass of the World Ocean was slightly undersaturated in BaSO₄. The experimental data were used to determine the values of the mean ionic activity coefficient of BaSO₄, total activity coefficient, and fractions of free Ва²⁺ ions in seawater: 0.108, 0.131, and 0.59, respectively.

中文翻译：

---

海水中BaSO 4的溶解度和钡的理化状态

摘要

实验研究了硫酸钡在稀Na ₂ SO ₄ -NaNO ₃溶液中的溶解度和盐度为35‰的海水在22℃下的溶解度。硫酸钡的热力学溶解度积的值为\（L _ {{{\ text {BaSO}} _ {4} ^ {0}}} ^ {0} \） =（7.57±0.87）×10 ^–11。结果表明，BaSO ₄中海水中溶解钡的平衡浓度为30.7μg/ L，世界海洋的水量略微饱和。实验数据用于确定BaSO ₄的平均离子活度系数，总活度系数和游离Ва2 ⁺分数的值 海水中的离子：分别为0.108、0.131和0.59。