Absolute measurement system for low electrolytic conductivity of aqueous solutions based on van der Pauw’s theory using a flow-through cell

Springer Science and Business Media LLC - Tập 19 - Trang 433-438 - 2014
Bing Zhang1, Zhen Lin2, Xiao Zhang2, Xiang Yu1, Xiaoping Wang1
1State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou, China
2Zhejiang Province Institute of Metrology, Hangzhou, China

Tóm tắt

A system was designed for measuring the low electrolytic conductivity of aqueous solutions based on an innovative application of van der Pauw’s theory. A four-electrode system with an axial–radial two-dimensional adjustment structure was used. A flow-through cell and a sealed system were built to avoid the CO2 contamination at low-conductivity values. In this paper, the new cell and the measurement system with flowing solution are described. A series of experiments were conducted to determine the appropriate frequency and flow rate. Moreover, static and flowing cell systems were compared for their efficacy to measure an ultrapure water sample. The second cell in the system can also be used to calibrate other conductivity devices.

Tài liệu tham khảo

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