近几年发展起来的新选择性试剂二硫代安替比林甲烷已用于铋的测定,此法虽有较好的选择性,但对铜的允许量却不大。当试样含铜量较高时,须用萃取法予以分离,因此分析时间长,很不方便。 本文系在文献的启示下,自己合成了新试剂2,3,4-三羟基-4′-磺基-偶氮苯(简称TCAB),并用此试剂作为光度法测定铋进行了一系列试验,证明TCAB与上述试剂相比,它显示一定的优越性,对铜、钴、镍的允许量相当大,尤其是铜,在测定条件下含 In recent years, the newly developed selective reagent dithioantipyrine methane has been used in the determination of bismuth, although this method has a good selectivity, but the allowable amount of copper is not large. When the sample contains a high amount of copper, it must be separated by the extraction method, so the analysis takes a long time and is very inconvenient. In this paper, under the enlightenment of the literature, a new reagent 2,3,4-trihydroxy-4’-sulfo-azobenzene (TCAB for short) was synthesized and a series of experiments were carried out using this reagent as a photometric method for the determination of bismuth. Proof TCAB compared with the above reagents, it shows some advantages, the allowable amount of copper, cobalt, nickel is quite large, especially copper, under the conditions of the assay containing