Transfer of the hexamolybdate ion, Mo6O192−, at the nitrobenzene(NB)/water(W) interface was studied by ion-transfer voltammetry. The Mo6O192− ion decomposed immediately after being transfered from NB to W. In the presence of orthophosphate ions in the weakly acidic W phase (pH 3.1), molybdophosphate anions, i.e. [H3PMo11O39]4−, were formed at the interface. A well-defined voltammetric wave due to the transfer of complex anions from W to NB was observed; the peak current was proportional to the bulk concentration of orthophosphate ions. Thus, the NB/W interface containing Mo6O192− in NB can function as an ion-selective electrode surface for a voltammetric determination of orthophosphate ions.
利用离子转移伏安法研究了六
钼酸盐离子 Mo6O192-在
硝基苯(NB)/
水(W)界面的转移。Mo6O192-离子在被从NB转移到W后立即分解。在弱酸性W相(pH 3.1)中存在正
磷酸盐离子的情况下,界面上形成了
钼磷酸盐阴离子,即[H3PMo11O39]4-。观测到了由于复合阴离子从W向NB转移而产生的清晰的伏安波;峰值电流与正
磷酸盐离子的本体浓度成正比。因此,含有 Mo6O192-的 NB/W 界面可以作为正
磷酸盐离子的伏安法测定的离子选择性电极表面。