引言双环己酮草酰二腙(简称BCO)测定金属铝中的铜,虽有较高的灵敏度,但形成蓝色络合物显色慢,且不稳定。如在BCO显色后的溶液中,加入适量乙醛,使双环己酮草酰二腙中的环己酮被乙醛取代而成双二醛草酰二腙,则立即出现极为稳定的紫红色络合物(ε=2.4×10~4),为此我们通过条件试验,制订了纯铝中微量铜的直接测 Introduction Bicyclohexanone oxalyldihydrazone (BCO) for the determination of copper in metallic aluminum, although with high sensitivity, but the formation of blue complex color is slow, and unstable. As in the BCO color after the solution, adding an appropriate amount of acetaldehyde, bicyclohexanone oxalyl dihydrazone cyclohexanone was replaced by acetaldehyde and diaraldehyde oxalyl dihydrazone, then immediately appeared extremely stable purple Complex (ε = 2.4 × 10 ~ 4), for which we passed the test conditions, developed a direct test of trace amounts of copper in pure aluminum