摘要
用自行设计安装的磁力浮沉子法密度装置测量溶液密度具有±3×10^(-3)kgm^(-3)的灵敏度,±3.5×10^(-3)kgm^(-3)的精密度。25℃时测定Nacl溶液的密度与Millero测量值平均偏差为2.6×10^(-3)kgm^(-3),求得NaCl的φ_v^0值为16.61(cm)~3mol^(-1)。 对12批中国标准海水及24个稀释中国标准海水的密度测量值(温度在15～25℃之间)与1980年国际海水状态方程计算值之间平均偏差为3.4×10^(-3)kgm^(-3)。实验结果表明中国标准海水及其稀释海水的密度与盐度及温度的关系遵从1980年国际海水状态方程。为中国标准海水作为溶液密度测量标准提供实验依据。
We have constructed a magnetic float densimeter which is similar to Millcros (1967).The accuracy of the apparatus has been verified by measuring the densities NaCl solutions at 25℃ These measurements agree on the average with those of Millcro (1967) to ±2.6×10-3kgm-3 We have made measurements of the relative densities of Chinese Standard Seawater with this densimeter.The densities of 12 batches of Chinese Standard Seawater and 24 samples diluted with pure water were measured at different temperatures with our densimeter.The measured densities were compared with those calculated from the International Equation of State of Seawater,1980.The overall average deviation between the measured and calculated densities is 3.4×10-3±2.4×10-3kgm-3.Results obtained show that the International Equation of State of Seawater (1980) can apply directly to Chinese Standard sea-water and its diluted samples.Also,our work provided the evidence for the Chinese Standard Seawater using for determination standard of solution density.
基金
国家自然科学基金No.4880238
关键词
磁力浮沉子
密度计
标准
海水
密度
Chinese Standard Seawatcr
density of scawater
magnetic float densimeter
