| 摘要 |
PURPOSE:To measure the concentration of crystal quickly and accurately regardless of the degree of concentration, by heating a sample, monitoring the curve of temperature increase, and correlating the curve with known saturation solubility data. CONSTITUTION:Crystalline slurry to be measured is sampled. The temperature of the sample is increased at a constant speed by externally applied heat. Then the first temperature increasing curve is indicated. The time point (temperature t2), when the crystal is all dissolved, is detected by finding a curved point in the temperature increase. The dissolved quantity X of the object component is obtained based on known saturation solubility data. Meanwhile, the temperature of the slurry before heating is actually measured. In this state, a quantity Z of the object component is present as the crystal, and a quantity Y is dissolved in mother liquor. Then the dissolved quantity Y at a temperaure t1 before heating is obtained based on the known saturation solubility data. As a result, the concentration of the crystal in the slurry to be found is given by an expression Z=X-Y. |
