三元配合——紫外分光光度法测定钕  

Ultraviolet Spectrophotometric Determination of Neodymium(Ⅲ)with 7-lodo-8-hydroxyquinoline-5-sulfonicAcid (Ferron) and Cetyl Trimethylammonium Bromide

作　　者：郑振峰[1] 

机构地区：[1]漳州职业技术学院食品与生物工程系,福建漳州363000

出　　处：《分析测试技术与仪器》2004年第1期38-41,共4页Analysis and Testing Technology and Instruments

摘　　要：在pH值为5.00的NaAc HAc缓冲体系中,Nd(Ⅲ)与7 碘 8 羟基喹啉 5 磺酸(FERRON)及溴化十六烷基三甲铵(CTMAB)反应形成三元配合物,最大吸收位于389.5nm处,Nd(Ⅲ)浓度在0.2～4.0mg/L范围内服从比耳定律,回归方程为:ΔA=0.1205C+0.0052,r=0.9996(ΔA为试验溶液吸光度Ai与空白溶液吸光度Ao之差;C单位为mg/LNd(Ⅲ)),表观摩尔吸收系数ε389.5=1.8×104L/(mol·cm),RSD=5.0‰(n=8),检出限为0 083mg/L.三元配合物的组成比为:Nd(Ⅲ)∶CTMAB∶FERRON=1∶2∶2.考察了20多种共存离子的影响,大多数常见离子不干扰.用于样品回收实验,结果满意.Neodymium(Ⅲ) reacted with 7-lodo-8-hydroxyquinoline-5-sulfonic acid and cetyl-trimethylammonium bromide to form a associated complex in NaAc-HAc(pH=5.00) buffer solution. The apparent molar absorptivity of the associated complex was found to be 1.8×104 L/(mol·cm) at 389.50 nm. In the range of 0.2 to 4.0 mg/L, Neodymium(Ⅲ) obeyed Beer′s law. The linear regresion equation was ΔA=01205C+00052 r=0.9996. Where C is mg/L of Neodymium(Ⅲ). The RSD for the determination of 2 μg/ml of Neodymium(Ⅲ) was 5.0‰(n=8).The molar ratio of Neodymium(Ⅲ) to cetyl trimethylammonium bromide to 7-lodo-8-hydroxy-quinoline-5-sulfonic acid in association complex was establish to be 1∶2∶2.The influence of 20 diverse ions was examined. Most common ions did not interfere.The method was proved to be satisfactory for the determination of Neodymium(Ⅲ) in recovery.

关 键 词：钕 7-碘-8-羟基喹啉-5-磺酸 溴化十六烷基三甲铵 三元配合物 紫外分光光度法 配合物组成比 

分 类 号：O614.335[理学—无机化学] O657.32[理学—化学]