改进的Dragendorff试剂法定量检测聚乙二醇  

Quantitative determination of polyethylene glycol with modified Dragendorff reagent method

作　　者：赵朔 王亚品[1] 韩明星[1] Zhao Shuo;Wang Yapin;Han Mingxing(China Lucky Group Corp,Baoding071054,China)

机构地区：[1]中国乐凯集团有限公司研究院物化室,河北保定071054

出　　处：《信息记录材料》2018年第11期36-39,共4页Information Recording Materials

摘　　要：以聚乙二醇(PEG)为标准物质,采用Dragendorff试剂(以下简称D试剂)法测定超滤膜截留率重现性较差。因此,提出了改进的D试剂法定量检测PEG,测试条件为:D试剂2.0m L,缓冲液2.0m L,显色时间15～20min。考察了D试剂的存放条件对PEG溶液浓度的标准曲线的影响,建议D试剂低温保存不超过7天。改进的D试剂法在一定浓度范围内,标准曲线的线性关系良好,测定结果可靠,能够满足日常测试需求。Polyethylene glycols（PEG） with different molecular weight are often employed as the standards to determine the rejection coefficient of ultrafiltration membranes. The Dragendorff reagent（hereinafter referred to as D reagent） method, which is generally used to determine the concentration of PEG quantitatively, suffers from poor reproducibility of test results. In this paper, a modified Dragendorff approach was provided, and the test conditions were as follows： 2.0 mL of D reagent volume, 2.0 mL of buffer solution volume and 15 - 20 min color reaction time. The effects of storage conditions of D reagent on the calibration curve of PEG solution concentration were investigated. The results suggested that D reagents should be stored at low temperature for no more than 7 days. With the modified method, the calibration curves displayed good linearity in certain range. It indicated that the modified method could give accurate results and satisfy daily tests.

关 键 词：Dragendorff试剂 超滤膜 聚乙二醇 截留率 

分 类 号：TQ317.2[化学工程—高聚物工业]