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一、引言Jacobsen等研究了双环巳酮草酰二腙(简称BCO)和双乙醛草酰二腙在铜分析中的应用。在Cu~(+2)离子与BCO试剂形成蓝色络合物后,加入过量乙醛,则双环巳酮草酰二腙的环巳酮被乙醛代换而成双乙醛草酰二腙,溶液的蓝色立即变为紫红色.此络合物的络合比为1:2,较Cu~(2+)—BCO络合物显色快、且稳定,克分子吸光系数最大(ε=2.3×10~4);灵敏度超过新亚铜灵、DDTC、BCO法;并且此络合物又容易制得.虽然这一反应早被介绍,但未见推广.
I. INTRODUCTION Jacobsen et al. Studied the application of bicycloxonium oxalate dihydrazone (abbreviated as BCO) and diacetaldehyde oxydizone in copper analysis. After Cu ~ (+2) ion forms a blue complex with BCO reagent and then an excess of acetaldehyde is added, the cyclohexanone of bicycloxonium oxalate diazoxide is replaced by acetaldehyde to form diacetal oxalic dianhydrazone , The blue of the solution changed to fuchsine immediately.The complex ratio of this complex was 1: 2, which was more stable and stable than that of Cu 2 + - BCO complex with the highest molar absorptivity = 2.3 × 10 ~ 4), the sensitivity is higher than that of neocuproine, DDTC and BCO method, and the complex is easy to obtain.