S. L. Wang, Y. J. Fu, W. C Zhang, X. Sun, Z. S Gao: In-Line Bulk Concentration Measurement by Method of Conductivity in Industrial KDP Crystal Growth from Aqueous Solution

Crystal Research and Technology

Cryst. Res. Technol. 35 (2000) 1027 - Abstract -

S. L. Wang, Y. J. Fu, W. C Zhang*, X. Sun, Z. S Gao

State Key Lab of Crystal Materials, Institute of Crystals, Shandong University, Jinan, China
*Chemistry Department, Jinan University, Jinan, China

In-Line Bulk Concentration Measurement by Method of Conductivity in Industrial KDP Crystal Growth from Aqueous Solution

The conductivity of KH₂PO₄ (KDP) aqueous solutions with varying saturation temperature from 28.5°C to 41.8°C was measured in the temperature range of 30°C to 40°C. It's proposed that the conductivity of KDP solutions can be expressed by L=L_o+b₁T+b₂T². This relation can be interpreted by Falkenhagen’s (1971) conductivity model of high concentration electrolyte solution. The experimental data agrees well to the relation with an accuracy of super-saturation within +-0.03g KDP/100g water (+-0.10% relative super-saturation).

Keywords: Falkenhagen's theory, concentration measurement, saturation temperature, conductivity, KDP solution, strong electrolyte

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