萃淋树脂分离-全差示光度法测定环境水样中铬Ⅲ和铬Ⅵ  

Determination of Trace Crand Crin Water Samples with Total Differential Spectrophotometric Method after Separation and Preconcentration with Levextrel Resin

作　　者：郭方遒[1] 黄兰芳[1] 梁逸曾[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《分析化学》2003年第10期1250-1252,共3页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金资助项目 (No .2 0 175 0 36;2 0 2 35 0 2 0 )

摘　　要：用CL TBP萃淋树脂分离富集Cr 和Cr 、对氨基二甲基苯胺做显色剂 ,采用全差示光度法测定环境水样中的Cr 和Cr 。方法的表观摩尔吸收系数为 3.42× 10 5L·mol- 1 ·cm- 1 ,线性范围为 0～ 0 .16mg/L ,线性方程为A =6 .7C +0 .0 0 1,(C :mg L) ,r =0 .9996 ,Cr 和Cr 的检测限分别为 8和 6 μg L。测定Cr 和Cr 分别为 18.7和 31.6 μg L ,其相对标准偏差分别为 3.1%(n =6 )和 2 .4%(n =6 )。Cr 和Cr 的标准加入回收率为 93.3%～ 10 2 .3%。用本法测定环境水样中Cr 和Cr ,结果满意。After separation and preconcentration with CL-tributyl phosphate levextrel resin and using p-Amino-N,N-dimethylaniline as coloring regent, a method for the determination of trace Cr and Cr in water samples with total differential spectrophotometric method has been developed. Its apparent molar absorptivity is 3.42×10 5L·mol -1·cm -1 at 554 nm. Beer′s law was obeyed in the range of Cr 0～0.16 mg/L, the standard curve is A′=6.7C+0.001, (C: mg/L), r=0.9996. The detection limit for the determination of Cr and Cr is 8 μg/L and 6 μg/L respectively. The analytical results indicate a precision of 3.1% and 2.4% for the determination of 18.7 μg/L Cr and 31.6 μg/L Cr respectively. The standard added recovery for Cr and Cr is between 93.3% and 102.3%. The proposed method was used for the determination of Cr and Cr in environmental samples with satisfactory results.

关 键 词：萃淋树脂 分离 全差示光度法 测定 环境水样 铬离子 对氨基二甲基苯胺 

分 类 号：O661.1[理学—分析化学]