摘要
在pH6.8的磷酸盐缓冲液中,在OP和乙醇存在下.Cu(Ⅱ)和邻苯二酚紫与罗丹明6G形成稳定的紫红色离子缔合物,最大吸收波长λ_max=560nm,表观摩尔吸光系数ε=5.1×10~4L·mol^(-1)·cm^(-1).Cu(Ⅱ)在0～15μg/25ml范围内符合比耳定律,所拟方法用于茶叶和面粉中微量铜的测定,结果满意.
It is found that in a phosphate buffer of pH 6. 8 and in the presence of OP and ethyl alcohol. a stable reddish violet ion association complex is formed between Cu( I ), pyrocatechol violet and rhodamine 6G. Under the optimum condition, the composition of this complex is : Cu( I ) : PV: RD6G=1: 1: 2. Beer's law-holds over the range of 0~15礸 of copper per 25ml with a molar absorptivity of 5.1?10^(1)L ?mol^(-1) ?cm^(-1). The proposed method has been used in the determination of microamounts of copper in. tea and wheat flour.
出处
《理化检验（化学分册）》
CSCD
北大核心
1999年第12期561-562,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
铜
协同显色
罗丹明6G
邻苯二酚紫
吸光光度法
Copper
Synergic chromogenic reaction
Rhodamine 6G
Pyrocatechol violet
Tea
Wheat flour
Absorptiophotometry
