【摘要】 提出了极谱法测定聚乙二醇 (PEG)的新方法。在 6× 1 0 - 3mol LHCl中 ,苯胺与亚硝酸钠反应生成重氮盐 ,该重氮盐分别与PEG 60 0、PEG 80 0、PEG 1 0 0 0、PEG 2 0 0 0反应的产物在HAc NH4 Ac缓冲溶液中各于-1 .0 6V、-0 .97V、-0 .92V、-0 .84V产生灵敏的极谱波。可用于分子量小于 2 0 0 0的PEG的定性及定量分析 ,导数波高分别与PEG 60 0浓度在 0～ 1 2g L、PEG 80 0浓度在 0～ 1 0g L、PEG 1 0 0 0浓度在 0～ 1 0g L、PEG 2 0 0 0浓度在 0～ 1 0g L范围内呈线性关系。更多还原

【Abstract】 A polarographic method for the determination of micro amount of polyethylene glycol(PEG) is proposed. In 6×10 -3 mol/L HCl, aniline can be diazotized by nitrite to produce diazonium, and then the diazonium reacts with PEG 600, PEG 800, PEG 1000 and PEG 2000 respectively. The products then produce sensitive polarographic wave at -1.06 V, -0.97 V, -0.92 V and -0.84 V in pH 4.2 HAc NH 4Ac buffer solution respectively. The first derivative wave heights is linear with the concentration of PEG 600 in the range of 0～12 g/L , PEG 800 in the range of 0～10 g/L , PEG 1000 in the range of 0～10 g/L , PEG 2000 in the range of 0～10 g/L respectively. The adsorption character of the waves was proved by experiments. The method is sensitive, simple and rapid; It has been successfully used to the determination of PEGs in washing powder.更多还原