锡(Ⅳ)的某些噻嗪染料络合吸附波研究和分析应用  

Study on the Adsorptive Complex Wave of Tin (IV) With Some Thiazine Dyes and Analytical Application

作　　者：张月霞[1] 岳冠华[1] 朱腾[2] 

机构地区：[1]冶金部钢铁研究总院,北京100081 [2]北京科技大学,北京100083

出　　处：《分析化学》1995年第11期1237-1242,共6页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金;中国科学院长春应用化学研究所电分析化学开放研究实验室资助课题

摘　　要：研究表明噻嗪染料中新亚甲蓝(NMB)或甲苯胺蓝(TB)在硫酸-草酸介质中与Sn(Ⅳ)在-0.60 V(υs.SCE)处出现一高灵敏的络合吸附电流,比无上述染料时电流增高约 16倍.检出限0.8ng/mL(相当6.7×10～(-9)mol/L)Sn(Ⅳ).NMB和TB在酸性介质中被质子化,可用R～+表示,与Sn(Ⅳ)形成缔合物〔Sn(C_2O_4)_3〕～(2-)·R_2～(2+).其表观稳定常数(K)分别为5.2×10～(10)(-NMB)和4.9×10～(10)(-TB).研究了电极过程的可逆性、吸附特性及电极反应机制,求得一系列常数和参数.方法已用于饮用水和试剂中痕量锡的直接测定,结果满意.Tin( Ⅳ ) in the medium of sulfuric acid-oxalic acid with some thiazine dyes, e. g. new methylene blue(NMB) or toluidine blue (TB) at -0. 60 V(vs,SCE) produced a high sensitive adsorptive complex wave. The sensitivity was increased about 16 time higher than that without such dyes in above medium. The detection limit was 0. 8 ng/mL (6. 7×10 9 mol/L) Sn( Ⅳ ). In the acidic medium NMB and TB were protonated with a positive charge, which could be expressed by R+. An associate complex CSn(C2O4)3]2- R22+ was formed, The apparent stability constant (K) was 5. 2×10-0(for -NMB) and 4. 9× 1010(for. - TB), respectively. The reversibility of electrode process, the character of adsorption and the mechanism of electrode reaction were investigated. A Series of constants and parameters were calculated. The proposed method has been applied to the determination of trace tin in drink water and reagent with satisfactory results.

关 键 词：锡 噻嗪染料 极谱法 饮用水 

分 类 号：O614.432[理学—无机化学] O657.14[理学—化学]