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铍的光度测定方法较多,但铍青铜中铍的测定多采用铬天菁S法。笔者采用MTB光度法也获得了良好结果。本文研究了铍(Ⅱ)与二甲酚橙(XO)形成红色络合物的组成及其吸光性质,试验了适宜的显色条件。结果证明,铍(Ⅱ)和XO在pH(?)4的微酸性或碱性溶液中均能形成稳定的红色络合物,并在pH6.4左右的乙酸-乙酸钠缓冲液介质中形成Be∶XO=2∶3的络合物且至少稳定8小时,其λ_(max)为510nm,摩尔吸光系数如ε_(510)=1.0×10~4,铍量在1—25微克/50毫升服从比尔定律。EDTA存在下方法有良好的选择
Beryllium photometric determination of more, but the determination of beryllium beryllium Chromium cyanine S method. The author also obtained good results with MTB spectrophotometry. In this paper, the red complex of beryllium (Ⅱ) with xylenol orange (XO) was studied for its composition and absorption properties. The suitable conditions for the color development were tested. The results showed that beryllium (Ⅱ) and XO can form stable red complexes in slightly acidic or alkaline solution of pH 4 and form Be in acetic acid-sodium acetate buffer at pH 6.4 : XO = 2: 3 and stable for at least 8 hours with a λ max of 510 nm, a molar extinction coefficient of ε 510 = 1.0 × 10 4, a beryllium amount of 1-25 μg / 50 ml Bill’s law. The method in the presence of EDTA is a good choice