溶液的介稳区宽度是结晶过程的基础研究之一。实验测定了纯磷酸二氢钠溶液在不同饱和温度下的介稳区宽度及25℃时含有杂质的磷酸二氢钠溶液的介稳区宽度,同时考察了pH值和降温速率对溶液介稳区宽度的影响。介稳区宽度的测定结果对指导磷酸二氢钠的结晶过程有参考价值。 The metastable zone width of the solution is one of the fundamental studies of the crystallization process. The metastable zone width of pure sodium dihydrogen phosphate solution at different saturation temperatures and the metastable zone width of sodium dihydrogen phosphate solution containing impurities at 25 ℃ were measured experimentally. The effects of pH value and cooling rate on the metastable zone The impact of width. The metastable zone width measurement results have reference value for the guidance of the crystallization process of sodium dihydrogen phosphate.