钴(Ⅱ)-PAN-SDBS共振瑞利散射法测定钴  

Determination of Co(Ⅱ) in Co(Ⅱ)-PAN-SDBS System by Resonance Rayleigh Scattering

作　　者：刘运美[1] 杨静[2] 高治平[1] 

机构地区：[1]南华大学生命科学与技术学院,衡阳421001 [2]南华大学化学化工学院,衡阳421001

出　　处：《应用化学》2007年第12期1467-1469,共3页Chinese Journal of Applied Chemistry

摘　　要：在pH=9．0的Tris-HCl缓冲溶液中，Co（Ⅱ）与PAN形成带正电荷的二元阳离子螯合物。进而与阴离子表面活性剂SDBS形成离子缔合物Co（Ⅱ）-PAN-SDBS体系，体系RRS强度增强，并产生相应的共振散射光谱。在0-5．0×10^-7g／mL浓度范围内，△IRRs与Co（Ⅱ）浓度呈线性关系，相关系数为r=0．9980，检出限为2．68×10^-9g／mL。将该法用于人发、茶叶、维生素B12中钴的测定，加标回收率为97．83％-105．4％。方法选择性好，有较高灵敏度，操作简便，测定结果满意。The RRS intensity was enhanced greatly when Co （Ⅱ） reacted with PAN to form cation chelate complex which further reacted with SDBS to form an ion-association complex in a pH = 9. 0 Tris-HC1 buffer solution, and the RRS intensity was linearly related to the concentration of Co（Ⅱ） in a range of 0-5.0×10^-7 g/mL（r = 0.9980）. Based on this fact, a sensitive and simple RRS method for the determination of Cobalt（Ⅱ） was proposed with a detection limit of 2.68×10^-9g/mL. This method was applied to the determi-nation of cobalt in human hair, tea leaves and vitamin B12 with a recovery of 97.83% - 105. 4%. This method has the advantages of high sensitivity, and it was applied to the determination of Co（Ⅱ） in same biological samples with satisfactory results.

关 键 词：co(Ⅱ)-PAN-SDBS 离子缔合物 共振光散射法 

分 类 号：O657.3[理学—分析化学]