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目前,测定钢铁中的微量铜多用双环己酮草酰双腙(BCO)法。但该法存在如下不足之处:一是BCO有互变异构平衡,使Cu~(2+)与BCO的络合反应变慢,当室温低于10℃时尤甚;二是所生成的蓝色水溶性络合物仅稳定3～10分钟。我们在Cu~(2+)和BCO形成蓝色络合物后,加入一定量的甲醛或乙醛,让它置换BCO中的环己酮的双甲醛草酰二腙(BFO)或双乙醛草酰二腙(BAO)法,使具有显色快而
At present, the determination of trace amounts of copper in steel with double cyclohexanone oxalyl double hydrazone (BCO) method. However, this method has the following deficiencies: First, BCO has a tautomerization equilibrium, which slows the complexation reaction between Cu 2+ and BCO, especially when the room temperature is lower than 10 ° C .; second, The blue water-soluble complex is only stable for 3 to 10 minutes. After forming a blue complex between Cu 2+ and BCO, a certain amount of formaldehyde or acetaldehyde is added to make it displace the bis-formaldehyde oxalydihydrazone (BFO) or diacetaldehyde of cyclohexanone in the BCO Oxalyl dihydrazone (BAO) method, so that with the color fast