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本文报道在溴化十六烷基三甲基铵(CTAB)存在下,Bi(Ⅲ)与邻苯三酚红(PR)的络合反应.在pH2的KNO_3-HNO_3缓冲溶液中,Bi(Ⅲ)与PR和CTAB形成蓝色三元络合物,λ_(max)615nm,ε2.O×10~4.用摩尔比法、连续变化法、斜率比法和Asmus直线法测得Bi∶PR∶CTAB=1∶1∶2,并推测其结构可能为[Bi(OH)PR(CTAB)_2].计算得表观稳定常数为1.4×10_(15).还研究了测定矿石中微量铋的各种条件和测定方案,铋在O～300μg/50mL范围内符合比尔定律.用合成样和标准样进行了方法考验,结果良好.
This paper reports the complexation of Bi (Ⅲ) with pyrogallol red (PR) in the presence of cetyltrimethylammonium bromide (CTAB). In the buffer solution of KNO 3 -HNO 3 at pH 2, ) With PR and CTAB blue ternary complex, λ_ (max) 615nm, ε2.O × 10 ~ 4. Using molar ratio method, continuous change method, slope ratio method and Asmus line method measured Bi: PR: CTAB = 1: 1: 2, and its structure may be presumed to be [Bi (OH) PR (CTAB) _2] .The calculated apparent stability constant is 1.4 × 10_ (15) According to Beer’s Law, bismuth is in the range of 0 ~ 300μg / 50mL, and the method has been tested with synthetic sample and standard sample. The results are good.