一种新的微量液体密度测量方法  

A new measurement method of micro liquid density

作　　者：陈超云[1] 文慧卿 金愿 Chen Chaoyun;Wen Huiqing;Jin Yuan(Shanghai Institute of Measurement and Testing Technology)

机构地区：[1]上海市计量测试技术研究院

出　　处：《上海计量测试》2020年第6期10-12,共3页Shanghai Measurement and Testing

摘　　要：针对微量液体密度测量困难、准确度低的问题,基于朗伯-比尔定律,研究了特定波长下微量液体的吸光度特性,通过溶液浓度和吸光度之间的线性关系得到被测微量液体密度。搭建吸光度法微量液体密度测量系统,采用与振动式液体密度计法比对试验的方式进行验证。50~100μL微量液体密度的试验数据表明:吸光度法微量液体密度测量系统与振动式液体密度计法测量值的最大偏差小于1 kg/m3,且吸光度法微量液体密度测量系统可以有效消除气泡对高黏度和易挥发液体的影响。Aiming at the difficulty and low accuracy of the density measurement of micro liquids,Based on the Lambert-Beer law,the absorbance characteristics of mirco liquids at specific wavelengths are studied.The density of the micro liquid to be measured is obtained by the linear relationship between the concentration of the solution and the absorbance.Set up micro-liquid density measurement system and verify it by comparing it with vibrating liquid densitometer.The test data on the density of 50-100μL micro liquid shows that the maximum deviation between micro-liquid density measurement system and vibrating liquid densitometer is less than 1 kg/m3.Compared with the vibrating liquid densitometer method,micro-liquid density measurement system can effectively eliminate the influence of bubbles on high-viscosity and volatile liquids.

关 键 词：微量液体 吸光度 密度测量 比对试验 

分 类 号：O645.1[理学—物理化学]