盐卤硼酸盐化学Ⅹ Ⅹ Ⅴ Ⅲ硼氧酸盐结晶液固相硼同位素组成

实验研究了硼氧酸盐在水溶液结晶沉淀后液固相硼同位素组成，结果表明，硼氧酸盐结晶固相的硼同位素组成与溶液相ｐＨ、总硼浓度及析出固相后固液相硼摩尔比有关，不仅存在正的硼同位素分馏效应，而且存在负的硼同位素分馏效应。

Chemistry of Borate in Salt Lake Brine Ⅹ Ⅹ Ⅴ Ⅲ Boron Isotopic Compositions of Saturated Aqueous Solution and Solid after the Precipitation of Borates

Boron was suggested to be used as useful tracer of the sources and evolution of aqueous fluid in the Earth's crust and hydrosphere due to large differences between marine and nonmarine evaporite borates. Boron isotopic compositions of saturated aqueous solution and solid after the precipitation of different borates were studied experimently. The experiment results shown that the boron isotopic composition of solid depends on pH and total boron concentration of aqueous solution, structural type of solid, and the fraction of total boron remaining in solution. There exists not only a positive fractionation effect, but also a negative fractionation effect.