Al(Fe)-o-NPF-CTMAB-乳化剂OP显色体系的研究和应用

Study on Colour Rection of AI(Fe)-o-NPFCTMAB-Emulsifier OP-System and its Application

研究了在阳离子表面活性剂CTMAB和非离子表面活性剂OP所组成的混合表面活性剂存在下,Al、Fe与ο-NPF的显色反应。实验结果表明,在pH6.2—7.8的缓冲介质中,Al、Fe能与ο—NPF生成稳定的络合物,其最大吸收峰位于λAl=556nm、λFe=610nm,摩你吸光系数为εAl=1.83×105、εFe=1.62×105,具有较高的选择性,并用于立方氮化硼和氮化硅中Al、Fe的同时测定。

The conditions for the formation of Al and o-nitrophenylfluorone (o-NPF) complex in the presence of mixed surfactant cetyltrimethyl ammonium bromide (CTMAB)-emulsifier polyethylene glycol octylpheny lester (OP)have been studied. The results show that Al and Fe form stable coplexes with o-NPF in the presence of CTMAB and OP in the pH range 6.2 to 7.8. The maximum absorptions are at 556(Al) and 610 nm(Fe). Therefore, No separation is necessary. The apparent molar absorptivity of the complex are 1.83×10~5(Al) and 1.62× 10~5(Fe).It has been applied to simultaneous determination of micro amounts of Al and Fe in boron nitride and silicon nitride with satisfactory results.