Reevaluation of Phenylfluorone Method of the Determination of Tin in Sub-Microgram Levels using Cetyl Trimethyl Ammonium Bromide (CTAB).

摘要

In an attempt to improve the phenylfluorone method for determining tin, the modification of the visible spectrum of tin (IV) fluorone complex has been studied by adding cetyl trimethyl ammonium bromide (CTAB). The band maximum observed as 530 nm for tin (IV) fluorone complex does not show any bathochromic shift but the absorbance of the band maximum is greatly enhanced compared with previous methods. The tin (IV) fluorone complex is formed at pH 1.2. The color development takes about 30 minutes and the color is stable for about two hours. Beer's law is obeyed up to 3.0 micrograms, giving a working range of 0.2 to 3.0 micrograms Sn/50 ml. (Author)