NaCl-KCl-H2O体系的体积性质及其与Pitzer模型的相关性研究  

Volumetric Properties of NaCl-KCl-H2O System and Their Correlation with Pitzer Model

作　　者：马修臻 胡斌[1] Ma Xiuzhen;Hu Bin(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining,810008)

机构地区：[1]中科院青海盐湖研究所中科院盐湖资源综合利用重点实验室青海省盐湖资源化学重点实验室,西宁810008

出　　处：《化学通报》2020年第5期459-463,共5页Chemistry

基　　金：青海省应用基础研究项目(2017-ZJ-704)资助。

摘　　要：本文用高精度数字式振荡管密度计测定了288~323K范围内NaCl-KCl混合溶液的密度,溶液的离子强度范围从0.1到4mol·kg^-1。用密度实验值计算了三元体系的超额体积并拟合得到了实验温度和浓度范围内的Pitzer模型参数,模型计算值与实验值的偏差在±0.0004g·cm^-3以内。用Pitzer模型计算了不同离子强度下三元体系在298.15K下的混合体积。The densities of NaC l-KCl aqueous mixture were determined at temperatures from 288. 15 to 323. 15 K and over a range of composition at ionic strength of 0. 1 ~ 4 mol·kg^-1. A high precision vibrating-tube densitometer was used in the measurement. The excess volumes of the mixed electrolytes calculated from the experimental data permitted a parameterization of the Pitzer model for mixtures with the entire range of temperatures and compositions covered by this study. In addition,using the Pitzer model,we determined the volume of mixing at constant ionic strength and at 298. 15 K.

关 键 词：密度 Pitzer离子相互作用模型 盐湖卤水 混合体积 

分 类 号：O642.4[理学—物理化学]