摘要
在ｐＨ４．４ＨＡＣ－ＮａＡｃ缓冲介质及乳化剂ＯＰ存在下，Ｃｒ６＋与二溴羟基苯基荧光酮（ＤＢＨＰＦ）显色反应生成桔红色络合物．该络合物最大吸收位于４８２ｎｍ波长处，表现摩尔吸光系数εｍａｘ＝３．４７×１０４．络合物配位比为Ｃｒ６＋：ＤＢＨＰＦ＝２：３，Ｃｒ６＋在０－１６μｇ／２５ｍＬ范围内遵守比耳定律．方法已用于水样中微量铬的测定，结果满意．
The colour condition for the complex reaction of chromium (Ⅳ )with dibromohydroxyphenylfluorone in the presence of emulior OP is studied. The absorbance of the complex is measured at 482um against a reagent blank with a molar absorptivity of 3. 47 × 104 L. mol(-1).cm(-1). The molar ratio of chromium(Ⅳ ) to dibromohydrxyphenylfluorone is established as 2: 3.Beer's law is followed in the concentration range of 0-16μg of chromium(Ⅳ)in 25ml of solution.The method developed has been successfully applied to the determination of microamounts of chromium in water samples with satisfactory results.
出处
《环境保护科学》
CAS
1996年第4期40-42,共3页
Environmental Protection Science
关键词
二溴羟基
苯基荧光酮
铬
测定
分光光度法
水样
Chromium (Ⅳ )
Dibromohydroxyphenylfluone Emulsion OP
Spectrophotometry
Water Sample.
