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离子交换树脂比色法,以溴邻苯三酚红(BPR)为试剂测定钼已有报导。本文以 BPR 试剂为显色剂在 pH=1.75下测定铋,使章道昆等用光度法测定铋的灵敏度提高至1.9×10~(-7)M。采用强碱性阴离子交换树脂(氯型)富集铋,分离严重干扰测定铋的钒,钨,钼,锑等元素,在原树脂相对铋进行测定,从而提高方法的选择性。铋与 BPR 形成紫红色配合物,配合比为1∶2最大吸收波长位于638微毫米,0～80
Ion exchange resin colorimetric method to bromine pyrogallol red (BPR) as a reagent has been reported molybdenum has been reported. In this paper, BPR reagent was used as reagent to determine bismuth at pH = 1.75, so that the sensitivity of bismuth was increased to 1.9 × 10 -7 M by Zhang Daokun et al. The strong basic anion exchange resin (chlorine type) is used to enrich bismuth. The separation of vanadium, tungsten, molybdenum, antimony and other elements that seriously interfere with the determination of bismuth is carried out on the original resin relative to bismuth to improve the selectivity of the method. Bismuth and BPR formation of purple complex, with a ratio of 1: 2 maximum absorption wavelength at 638 micro mm, 0 to 80