THE TRANSFER BEHAVIOUR OF SOME CATIONS AT WATER／NITROBENZENE INTERFACE BY SEMIDIFFERENTIAL CYCLIC VOLTAMMETRY

The transfer of Sr~(2+) and Ba~(2+) ion, facilitated by 18-Crown-6 present in the aqueous phase, and of succinylcholine ion at w/nb interface were investigated by semi-differential cyclic voltammetry. A good polarographic curve of succinylcholine ion dissolved in water was obtained in the system of 0.01 mol/l LiCl (w)——0.01 mol/l TBATPB (nb). The peak current is directly proportional to the concentration of SC~(2+) ion. It can be used for the determination of SC and the detection limit is 1.05×10~(-5) mol/l.The apparent D~w and D~(nb) have been estimated. The transfer of Sr~(2+) and of Ba~(2+) at the interface are facilitated by 18-Crown-6 present in the aqueous phase and the peak current is directly proportional to the concentration of 18-Crown-6 in water. This method can be used for the determination of the complexing agent and for the stability constant of the complex formed in the aqueous phase.All the experimental results are in keeping with the theoretical.     

2,9-二甲基-1,10-菲罗啉络合推动Ni~(2+)离子在水/硝基苯界面传递的研究

用半微积分伏安法研究了2,9—二甲基—1,10—菲罗啉(L)络合推动Ni(Ⅱ)离子在水/硝基苯界面的传递行为。在0.1mol/L NiCl_2(或NiSO_4)(W)—0.05mol/L TBATPB,L(NB)体系中,Ni(Ⅱ)与L生成NiClL~+(或NiL_2~(2+))络合离子,从而在W/NB界面发生离子传递。当C_(Ni~(2+))>>C_L,e_p与C_L成正比,线性范围为1×10~(-6)mol/L～5×10~(-4)mol/L,可作为L的定量分析。文中进行了理论探讨,测得了络合物的形成常数等。     

铟—PAR络合吸附波的极谱行为研究

本文介绍了在0.09mol/L NH_3·H_20—0.21mol/L NH_4Cl介质中,当有8×10~(-5)mlo/L PAR存在时,In~(3+)在—0.85V(vs.S·C·E·)处产生一灵敏的络合吸附波,其线性范围为0.1～0.8μg/ml。对这一络合吸附波的性质进行了研究,并测定了该络合物的组成。利用In—PAR络合吸附的极谱行为进行了纯铅中微量铟的加入回收实验,测定了合成样品中的微量铟。     

半微分循环伏安法对Fe~(3+)(w)/FeCP_2(nb)在水/硝基苯界面上电子传递行为的研究

本文用四电极系统半微分循环伏安法对FeCl_3(w)/FeCP_2(nb)体系间的电子传递进行了研究,得到了FeCl_3(w)/FeCP_2(nb)在水/硝基苯界面电子传递良好的半微分极谱峰,且通过对本体系的半积分定量测定,证实半微分实验的结论。     

THE TRANSFER OF ALKALINE EARTH-METAL ION AT W／NB INTERFACE FACILITATED BY JOSAMYCIN

This paper describes the investigation of the transfer behaviour of the alkaline earth-metal cations across the water/nitrobenzene interface facilitated by josamycin in the nitrobenzene phase using semi-differential cyclic voltammetry. The peak height is directly proportional to the concentration of josamycin (nb) and to the potential scan rate. The complexes formed from alkaline earth-metal ions and josamycin at the w/nb interface are ML_2~(2+) ion.     

油/水界面半微分循环伏安分析法

本文介绍了油/水界面半微分循环伏安分析方法,并用该法测定了H_2O/PhNO_2体系中的TMA~+和18-冠-6。实验结果表明该法比普通油/水界面循环伏安分析法灵敏、准确。     

THE TRANSFER OF TMA＋ ION AT THE WATERN NITROBENZENE INTERFACE USING SEMI-DIFFERENTIAL CYCLIC VOLTAMMETRY

This paper describes the investigation of the electrochemical phenomena of TMA transfer at the w/nb interface using semi-differential cyclic voltammetry. The expressions for the peak potential, half-wave width and peak current are derived. All the experimental results are in good agreement with the theoretical ones.     

溶液的粘度对扩散电流的影响

本文系采用蔗糖和甘油借以改变溶液的粘度,所测得溶液粘度对扩散电流的影响。根据Ilkovie公式和Stokes—Einstein关系式可得: i_d=K(1/η1/2)即扩散电流与溶液粘度的平方根成反比。实验结果表明,溶液粘度对扩散电流的影响极大。Cd~( )、Pb~( )、Zn~( )、Ni~( )离子在蔗糖溶液中,当溶液粘度在4.37(相对)以下时,所测得的i_dη1/2之值为接近常数,大于4.37时则i_dη1/2不成常数,这与Mckenzie的结果基本符合。在不同浓度的甘油溶液中(至50％左右),Cd~( )、Pb~( )、Ni~( )离子的i_dη1/2的值均接近常数。因此,同一待测物质,由于改变溶液粘度的物质不相同,对i_dη1/2之值有不同的影响。     

半微分循环伏安法对离子在油水界面传递的研究——18—冠—6推动下钠离子的传递

本文提出用半微分循环伏安法研究油/水界面上的电化学现象,对于体系NaCl,18-C-6(W)—TBATPB(nb),推导出了半微分峰电流e_ρ、半波电势△_w~(n b) ψ1╱2的计算公式。e_ρ与水相中18-C-6的浓度成正比,据此可对18-C-6进行定量分析,线性范围1.5×10~(-3)mol/L—5.0×10~(-5)mol/L。