摘要
为寻找水相镀镍液中微量铜的光度分析新方法,研究了铜与双环己酮乙二酰二腙(BCO)和乙醛的显色反应,建立了水相测定镀镍溶液中铜的光度分析新方法。在pH值为8~10的条件下,铜与双环己酮乙二酰二腙(BCO)和乙醛的配合物稳定保持在水相中,直接进行光度分析。该体系的配合物在545 nm处有最大吸收峰,线性范围为0~1μg/mL,其表观摩尔吸光系数为2.49×104L/(mol.cm),方法检出限为0.007μg/mL,该方法用于测定镀镍液中的铜在不同水平的加标回收率为99.8%~105.5%,相对标准偏差为1.1%。该方法灵敏度、准确度高,测定过程迅速、简便,常见的其他成分无干扰。
A new aqueous phase spectrophotometric method was established to determine the trace Cu^(2+) in nickel-plating solution,by taking into account the color-displaying reaction of Cu^(2+) with biscyclohexanone oxalyldihydrazone(BCO) and acetaldehyde.It was found that Cu^(2+) formed a stable aqueous-phase complex with BCO~acetaldehyde at a pH value of 8~10,which makes it possible to determine the Cu^(2+) using spectrophotometry.The maximum absorption of the complex was located at 545 nm,with the linear range to be 0～1.0 μg/mL,and it had an apparent molar absorptivity of 2.49×10~4 L(/(mol·cm))and a detecting limit of 0.007(μg/mL).Moreover,the correlation coefficient and the relative standard deviation for the established method were 0.999 7 and 1.1%,respectively.And the trace Cu^(2+) in the nickel-plating solution with respect to different levels of standard was recovered at a rate up to 99.8 %～105.5 %.In general,the method could be used to determine the trace Cu^(2+) in the electroplating solution easily,rapidly and accurately,and almost no interference by other coexisting ions was observed.
出处
《材料保护》
CAS
CSCD
北大核心
2006年第5期73-75,共3页
Materials Protection
