Abstract

Transformation of the chemical composition of seawater upon interaction with loess, an analog of natural terrigenous aerosols of the Pleistocene, was studied experimentally. It was shown that this process leads to a change in the concentrations of major ions (K, Ca, SO₄, and HCO₃), nutrients (Si and P), and fluorine, while the chloride, sodium, and magnesium contents do not vary due to their high concentrations in seawater. With increasing weight fraction of the solid phase, the sulfate and hydrocarbonate concentrations increase, while the potassium concentration decreases. The calcium and fluorine concentrations either increase or decrease depending on the content of mobile forms of these elements in the samples. The release of silicon and phosphorus into seawater has an asymptotic limit: 2.5–3.3 mg Si/L and 0.012–0.040 mg P/L. The relationship between the change in concentrations of studied components in seawater and the weight fraction of the solid phase corresponds to a hyperbolic function, but with a relatively small weight fraction, it is described by a linear equation, in which the angular coefficient has a positive correlation with the concentration of the component in an aqueous extract from this loess sample. A change in seawater composition upon interaction with loess can be predicted from the composition of their aqueous extracts.

中文翻译：

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陆源气溶胶相互作用下海水化学成分的转化

摘要

实验研究了与黄土（一种更新世的天然陆源气溶胶的类似物）相互作用后海水化学成分的转化。结果表明，该过程导致主要离子（K，Ca，SO ₄和HCO ₃），养分（硅和磷）和氟，而氯化物，钠和镁的含量不会因海水中的高浓度而变化。随着固相重量分数的增加，硫酸盐和烃化物的浓度增加，而钾浓度的减少。钙和氟的浓度根据样品中这些元素的流动形式的含量而增加或减少。硅和磷向海水中的释放具有渐近极限：2.5-3.3 mg Si / L和0.012-0.040 mg P / L。海水中所研究成分的浓度变化与固相重量分数之间的关系对应于双曲线函数，但是重量分数相对较小，可以通过线性方程来描述，其中角系数与该黄土样品的水提物中成分的浓度呈正相关。与黄土相互作用时，海水成分的变化可以从其水提取物的成分中预测出来。