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首页> 外文期刊>Contributions to Mineralogy and Petrology >Effect of boiling on the acidity of hydrothermal solutions
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Effect of boiling on the acidity of hydrothermal solutions

机译：沸腾对水热溶液酸度的影响

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摘要

Natural seawater and H2O-NaCl solutions were equilibrated along the two-phase (liquid-vapor) curves between 150 and 390 degrees C to re-examine the effect of liquid-vapor phase separation on element fractionations between saline brines and vapor phases. The experimental setup allows vapor and brine to be sampled separately at in situ P-T conditions. Experimental vapor pressure is constrained by temperature and the electrolyte concentration of the brines. With increasing temperature, dissolved electrolytes react with increasing temperature to hydroxides and HCl, in both seawater and H2O-NaCl solutions. The extent of hydrolysis is more pronounced in seawater than in H2O-NaCl solutions because seawater contains, in addition to NaCl, a range of other electrolytes capable of hydrolysis. Associated HCl has a great affinity to fractionate to the vapor phase when phase separation occurs. At 365 degrees C, halite-saturated vapor phases have a pH(25) (pH after condensation to 25 degrees C) of 1.8 (seawater) and 2.8 (H2O-NaCl brines). Our data suggest that boiling of hydrothermal solutions followed by mixing of vapor condensates with seawater can impose pH(25) values as acidic as the most acidic natural hydrothermal solutions vented on the ocean floor.
机译：天然海水和H 2 O-NaCl溶液沿着150和390℃的两相（液 - 蒸气）曲线平衡，以重新检查液态气相分离对盐水盐水和蒸汽相之间的元素分级的影响。实验装置允许在原位P-T条件下单独进行蒸汽和盐水。实验蒸气压受温度和盐水的电解质浓度约束。随着温度的增加，溶解电解质在海水和H 2 O-NaCl溶液中与氢氧化物和HCl的增加反应。水解程度在海水中比H2O-NaCl溶液更加明显，因为海水除了NaCl之外，还含有一系列能够水解的其他电解质。当发生相分离时，相关的HCl对分馏到气相具有很大的亲和力。在365℃下，饱和饱和的蒸气相具有1.8（海水）和2.8（H2O-NaCl盐水）的pH（25）（缩合至25℃的pH）。我们的数据表明，水热溶液的沸腾随后用海水混合混合，可以将pH（25）的值施加为酸性，因为最酸性的天然热热溶液在海底上排出。

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