双环己酮草酰二腙(BCO)分光光度法测定钢铁中铜

Determination of Copper Content in Steel and Iron by the Bis-Cyclohexanone Oxalydihydrazone Spectrophotometric Method

二价铜在pH=9．0-9．5硼酸钠缓冲溶液中与双环己酮草酰二腙（BCO）生成蓝色络合物，其在最大吸收波长600nm处吸光度与铜的浓度符合比尔定律，据此建立了测定铜的方法。实验了铜（Ⅱ）的显色条件、稳定时间、干扰元素的干扰量及干扰元素的排除方法等，实验证明，方法的相对标准偏差（RSD）为1．1％-2．4％，所测结果与标准值基本一致，方法已成功应用于铸铁、合金钢中0．01％-3．0％铜含量的测定。

Cu （Ⅱ） interacts with Bis-Cyclohexanone Oxalydihydrazone （BCO）in sodium borate buffer solution at pH 9.0 - 9.5, generating a blue complex. The relationship between the absorbance at the maximum absorption wavelength of 600nm with the content of copper obeys the Lambert-Beer＇s law, based on which a method for determination of copper was established. Color developing condition for Cu（ Ⅱ ）, stabilization time, the tolerance for interfering elements and the way of removal of interfering elements were experimentally studied. The experimental results show that the relative standard deviation （RSD） was 1.1% - 2.4%, which was consistent with the standard values. This method has successfully been applied to determine copper with the concentration of 0. 005%-3.0% in ingot iron and alloy steel.