本文叙述了十水和无水硫酸钠转变点降低法的原理和一种装置及其使用方法,并举例加以说明。在使用时应注意的事项中特别说明了读取转变点方式应采用步冷曲线的有规则下降部分的外推法,而不应以某一时刻或某一点的温度为转变点。 This paper describes the principle of decahydrate and anhydrous sodium sulfate transition point reduction method and a device and its use, and examples to illustrate. It should be noted in the use of matters that read the transition point should be used to take the step-down curve of the regular decline of the extrapolation, rather than at a certain point or point of time as the temperature transition point.