D试剂法超滤膜截留聚乙二醇的研究

Discussion about ultrafiltration membranes retention performance by D reagent method

较详细的探讨了以聚乙二醇作为基准物质,用Dragendoff试剂(以下简称D试剂)法测定超滤膜截留性能中存在的问题.考察了D试剂的存放条件对聚乙二醇溶液浓度与吸光度的标准曲线的影响,发现D试剂随存放时间的延长,使测试体系的吸光度提高,且存放温度越高,变化越大.考察了D试剂用量、缓冲溶液用量以及显色时间等因素对聚乙二醇溶液吸光度的影响,得出按照行标要求进行测试的必要性和依据.提出了D试剂法在超滤膜工业生产中,测试其截留性能的一种简便方法.

In this paper, polyethylene glycol is regarded as standard substance for discussing in detail, Dragendoff method is widely used for solving problems of uhrafitration membrane separation performance. We study the influences of preservation conditions by Dragendoff method for separation performance standard curve. As the storage time increases, the absorbance of the testing system will also increase. The storage temperature is directly proportional to change. Then we study the amount of D reagent dosage and the buffer solution, chromogenic reaction time. It concludes the necessery and basis of measurement complying with industry standard. Finally, a simple method of D method in industrial for separation performance is put out.