In sulphuric acid medium tungsten forms a ternary complex with bromo- pyrogallol red and cetyltrimethyl-ammonium bromide. The Beer's law is obe- yed for tungsten oxide of 0-200 ug/50m1. By the addition of EDTA and NH20H.HCl twenty kinds of foreign ions do not interfere and the quantity tolerance for chromium is 30 times that of tungsten.
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辛莉莉,1983,溴邻苯三酚红光度法测定含铬矿石中的钨[J].岩石矿物学杂志,2(2):142~143.,1983,SPECTROPHTOMETRIC DETERMINTION OF TUNGSTEN IN MINERALS AND ROCKS CONTAINING CHROMIUM WITH BROMOPYROGALLOL RED[J]. Acta Petrologica et Mineralogica,2(2):142~143.
