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使用BCO直接光度法测定钢及合金中铜含量是一个较好的方法,由于它良好的重现性和选择性故被日本及我国采用作为标准方法。但钴(镍)的干扰严重故不适用于含钴的试样。 本文指出,虽然普遍采用PH8.7～9.5作为测定铜的适宜条件,但不宜于测定含钴的试样,因为在此条件下,钴与试剂形成无色络合物,耗用了试剂,降低了吸光度。又指出铜的显色在PH8.0～9.8之间保持恒定,但钻的BCO络合物,由于不夠稳定在PH8.5以前不与试剂反应,故若把条件控制在8.3±0.2,钴就不再干扰而铜的吸光度仍然保持PH8.7～9.5时的强度。文中还给出了详细的分析手续及实际试样的分析数据。
BCO direct spectrophotometric determination of copper in steel and alloy is a better method, because of its good reproducibility and selectivity, it is adopted by Japan and China as a standard method. However, the serious interference of cobalt (nickel) is not suitable for cobalt-containing samples. This paper points out that although it is common to use PH8.7 ~ 9.5 as a suitable condition for the determination of copper, it is not suitable for the determination of cobalt-containing samples because cobalt forms a colorless complex with the reagents under this condition, consumes reagents and reduces Absorbance. Also pointed out that the color of copper in the PH8.0 ~ 9.8 to maintain a constant between, but drilling BCO complex, not stable enough before PH8.5 react with reagents, so if the conditions are controlled at 8.3 ± 0.2, cobalt No longer interfere with the absorbance of copper while still maintaining the strength of PH8.7 ~ 9.5. The article also gives detailed analysis procedures and the actual sample analysis data.