协同显色反应测定粮食中铝(Ⅲ)  

Measurement of Aluminum(Ⅲ) in Crops by Synergistic Chromatic Reaction

作　　者：刘文明[1] 马卫兴[1] 于瑞珠 

机构地区：[1]淮海工学院化学工程系,连云港222005

出　　处：《光谱学与光谱分析》1999年第5期760-762,共3页Spectroscopy and Spectral Analysis

摘　　要：在ｐＨ６．５醋酸铵－醋酸缓冲液中，在ＯＰ存在下，铝（Ⅲ）和邻苯二酚紫与罗丹明６Ｇ形成紫红色离子缔合物。最大吸收波长λｍ ａｘ ＝ ５８０ ｎｍ ，表观摩尔吸光系数ε＝ ６．８×１０４ Ｌ·ｍ ｏｌ－ １ ·ｃｍ － １ 。铝（Ⅲ）在０～７ μｇ／２５ ｍ Ｌ范围内符合比耳定律。本法灵敏度高，选择性好，用于粮食中微量铝（Ⅲ）的测定，结果满意。In the presence of OP,a sensitive color reaction of aluminum(Ⅲ) on pyrocatechol violet and rhodamine 6G has been studied.In a NH 4Ac HAc(pH=6 5)medium,aluminum(Ⅲ)ions form an ions associate complex with pyrocatechol violet and rhodamine 6G.The composition of the complex is Al(Ⅲ)∶PV∶Rh6G=1∶2∶4.The maximum absorption of the ions associate complex is at 580 nm with an apparent molar absorptivity of 6 8×10 4 L·mol -1 ·cm -1 .Beer′s law is obeyed in the range of 0—7 μg/25 mL of aluminum.The method is highly selective and has been applied to the determination of trace aluminum in crops with satisfactory results.

关 键 词：粮食 测定 铝 协同显色 分光光度法 

分 类 号：TS210.7[轻工技术与工程—粮食、油脂及植物蛋白工程]