1,2-二氯乙烷萃取分光光度法间接测定钢中硼  

Indirect determination of boron in steel samples by spectrophotometry after 1,2-dichloroethane extraction

作　　者：陆建平[1] 彭剑[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《冶金分析》2007年第7期70-72,共3页Metallurgical Analysis

基　　金：广西大学科研基金资助项目(X051108)

摘　　要：本文研究了萃取一分光光度法测定钢中硼。考察了萃取剂的种类、体积及萃取体系的酸度等因素对萃取率的影响。在PH3．7的甲酸一甲酸钠缓冲溶液中，硼、苯羟乙酸和[Fe（phen）3]^2＋络合生成具有较大疏水性的化合物，1，2-二氯乙烷萃取后采用分光光度法测定有机相中的铁，间接测定硼含量。结果表明，络合体系的最大吸收波长为513nm，硼量在0．11～3．2μg／mL范围内呈良好线性关系，方法的检出限为0．032ug／mL。方法用于钢中硼的测定，相对标准偏差为0．8％～2．0％，结果同认定值相吻合。Indirect determination of boron in steel was investigated UV-spectrophotometrically. The effect of solvents, volumes and acidity in the extraction system on extractability of boron was experimentally explored. In a medium of formic acid--sodium formate buffer solution of pH 3. 7, borax , mandelic acid and [Fe（phen） 3 ]^2＋ form a hydrophobic association complex which can be extracted with 1,2-dichloroethane. The indirect determination of boron in steel samples is achieved by determining iron in organic phase UV-spectrophotometrically. The results show that the maximum absorption wavelength of the complex is at 513 nm, and the detection limit is 0. 032 μg/mL. The calibration curve is linear over the range 0. 11-3. 2μg/mL for boron. The method has been applied in the determination of boron in steel,giving the relative standard deviation of 0. 8 %--2. 0%. The results are consistent with the certified values.

关 键 词：分光光度法 硼 钢 1 2-二氯乙烷 萃取 

分 类 号：TG115.3[金属学及工艺—物理冶金]