三元缔合物溶剂浮选光度法测定痕量硼  

Determination of trace boron by ternary-assiociation compound solvent flotation spectrophotometry

作　　者：闫永胜[1] 徐婉珍[1] 王德萍[1] 曹永林[1] 王赟[1] 张志刚[1] 

机构地区：[1]江苏大学化学化工学院,江苏镇江212013

出　　处：《冶金分析》2006年第2期25-27,共3页Metallurgical Analysis

基　　金：科技部创新基金(2004ED690212);江苏大学高级人才基金(04JDG017)

摘　　要：基于苦杏仁酸与B（Ⅲ）可生成稳定配位化合物，该配位化合物可进一步和孔雀绿形成三元缔合物，该缔合物难溶于水且不稳定，但易溶于苯、甲苯、二甲苯等有机溶剂，据此建立了溶剂浮选光度法测定硼的新方法。该法灵敏度高，ε=2．7×10^5mol·L^-1·cm^-1，大多数共存离子不影响测定。测10μg硼10次，RSD=1．9％；检出限为0．56μg／mL。实测了钢样和人发中硼，相对标准偏差为1．2％～4．7％，回收率在95．2％～100．1％之间。B（Ⅲ） reacts with amygdalic acid and malachite green to form a ternary-assiociation compound, which is insoluble and unstable in water, but dissolve in organic solvents such as benzene, methylbenzene, dimethyl benzene. Base on this, a new solvent flotation spectrophotometry is introduced for the determination of boron. This method has advantages of high sensitivity（ ε = 2.7 × 10^5 mol· L^- 1. cm^- 1 ）, good selectivity（most of the ions are found not to interfere with the determination）and excellent accuracy（RSD = 1.9 %, n = 10, m = 10.0μg）. The detection limit is 0.56μg/mL. It has been used to the determination of boron in both steel and human hair with the RSD of 1.2% -4.7% and recovery of 95.2% -100.1%.

关 键 词：溶剂浮选 三元缔合物 光度法 硼 

分 类 号：O657.3[理学—分析化学] O613.81[理学—化学]