铋(Ⅲ)-8-羟基喹哪啶体系极谱行为——表面活性剂增敏机理和分析应用——Ⅱ.铋(Ⅲ)-8-羟基喹哪啶络合物电极反应和十二烷基苯磺酸钠增敏机理

Polarographic Behaviour of Bismuth (Ⅲ)-8-HydroxyquinaIdine-The Enhancement Mechanismand Analytical Application of SurfactantⅡ . The Electrode Reaction Mechanism of Bismuth( Ⅲ )-8-Hydroxyquinaldine Complex and the EnhancementMechanism of Sodium

试验表明,铋(Ⅲ)-8-羟基喹哪啶(8-OXQ)络合物(pHll,-0.60V)的峰电流(p)具吸附特性,为准可逆电极反应过程,其电子转移数(n),传递系数(α)及饱和吸附量(Γ_ο)分别为3,0.45,6.5×10^(-12) mol/cm^2。加入十二烷基苯磺酸钠(SDBS)未形成三元络合物,因SDBS的超载强烈吸附,引起诱导吸附,电双层结构激烈变化,而使电流峰形巨变,电流峰高(i_p)增大10余倍。讨论并指出SDBS对Bi(Ⅲ)与8-羟基喹啉(8-OX)及衍生物络合吸附电流增敏或抑制,与试剂组分、结构、解离态及络合物存在状态、电荷数、符号有关。

The experimental results demonstrated that the peak current (p) of Bi( Ⅲ )-8-hydroxyquinaldine (8-OXQ) complex [pH 11,Ep-0. 060 V(vs. SCE)] behaved an adsorptive character and a quasi-reversible process of electrode reaction, the number of electrons(n) , the transfer coefficient (a) and the amount of saturated adsorption(Γos) were 3,0. 45 and 6- 5 × 10-12 mol/cm2 .respectively. Ternary complex does not form after adding sodium dodecyl benzene sulfonate(SDBS). Because DBS' (negative charged) adsorbed on the electrode surface superabundantly .therefore the amount of BiLf (species of Bi( Ⅲ ) -8-OXQ) species was induced to accumulate on that surface much more than the usual ; mean while the structure of electric double layer has been changed strongly,that was the reason of the intensive changing the current shape and the great increasing the peak current of Bi( Ⅲ ) -8-OXQ complex for more than ten times. The enhancement of peak current of complex Bi ( Ⅲ ) with 8-oxine and its derivatives by SDBS was also discussed. which indicated that whether the corresponding system was enhanced or suppressed by SDBS, depended on the composition, the structure. the dissociated form of the reagent used and the existing form,the charge number and symbol of that complex.