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Cr(Ⅵ)与溴邻苯三酚红(BPR)的反应极弱。本文详细研究了β-环糊精(β-CD)和溴化十六烷基吡啶(CPB)对Cr(Ⅵ)-BPR体系的协同作用。此体系的表观摩尔吸光系数ε＇650nm为7.80×10~4(比不加β-CD时增加119％)。Cr(Ⅵ)浓度在0～6.0μg/25ml范围内符合比尔定律,其线性回归方程式为y=0.18C,相关系数r≈1.000。已应用于测定电镀水中的铬(Ⅵ),与用二苯羰酰肼法所得结果比较,颇为满意,但其灵敏度大于后者。
The reaction of Cr (Ⅵ) with bromopyrogallol red (BPR) is very weak. The synergistic effects of β-cyclodextrin (β-CD) and cetylpyridinium bromide (CPB) on Cr (Ⅵ) -BPR system were studied in detail. The apparent molar absorptivity ε’650nm of this system was 7.80 × 10 ~ 4 (119% higher than that without β-CD). Beer’s law is obeyed in the range of 0 ~ 6.0μg / 25ml for Cr (Ⅵ). The linear regression equation is y = 0.18C and the correlation coefficient r≈1.000. Has been applied to the determination of chromium (VI) in electroplating water, compared with the results obtained by diphenylcarbazide method, quite satisfactory, but its sensitivity is greater than the latter.