摘要
研究了新显色剂 5 (对羧基苯偶氮 ) 8 羟基喹啉 (5 CPAHQ)在阳离子表面活性剂十六烷基三甲基溴化铵 (CTMBA)存在下 ,与铁 (Ⅲ )的显色反应条件。试验结果表明 ,在pH 4 .2～ 5 .6范围内 ,该显色剂可与铁 (Ⅲ )形成 1∶6稳定的红色配合物。在 4 4 8nm波长处配合物的表观摩尔吸光系数为 4 .14× 10 4 L·mol- 1·cm- 1,该法用于力勃隆药片和大黄中铁的测定 。
The optimum conditions of the color reaction of 5 (4 carboxy phenylazo) 8 hydroxyquinoline (abbreviated as 5 CPAHQ) with iron(Ⅲ) is studied and reported in this paper. It is found that in a buffered medium of pH 4.2 to 5.6, the color reaction between 5 CPAHQ and Fe(Ⅲ) takes place in the presence of CTMAB, forming a red complex with a mole ratio of Fe∶R=1∶6. The colored complex shows an absorption maxima at 448nm where an apparent molar absorptivity of 4.14×10 4L·mol -1 ·cm -1 is found. Beer′s law is obeyed in the range of 0～14μg of Fe(Ⅲ) per 25ml of solution. This reaction has been applied satisfactorily to the determination of iron in some drugs such as ammonium ferric citrate tables and rheum etc.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2001年第12期553-555,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
