摘要
在PVA、OP或Tween-60存在下,采用平衡移动法确定了碱性染料亚甲基蓝、耐尔蓝(NB)、罗丹明B(RB)、丁基罗丹明B(BRB)、结晶紫(CV)、乙基紫(EV)与Ta的摩尔比是1:1至7:1;考察了NB(或BRB)-钽钼杂多酸缔合物的红外光谱,初步探讨了反应机理:比较了几个碱性染料-钽钼杂多酸缔合物体系的光度特性,筛选出两个摩尔吸光系数】2×10~6的分析体系,并用于合金钢和地质标样中痕量Ta的测定,方法可行。
The ion-associates formed from the basic dyes-Nile blue (NB) , methylene blue, rhodamine B (RB) ,butyl rhodamine B(BRB),crystal violet and ethyl violet with molybdotantalate heterpoly acid were studied by the equilibrium movement method in the presence of poly vinyl alcohol, Tween-60 or OP. The molar ratios of Ta( Ⅴ )to the basic dyes were found to be 1:1 to 1:7. The infrared spectra of the NB(or BRB)-ion-associates were studied and the reaction mechanisms discussed. The NB(or BRB)-molybdotantalate systems are highly sensitive (molar absorptivities>2×106)and have been applied to the determination of Ta in steels and ores,the results obtained were satisfactory.
出处
《岩矿测试》
CAS
CSCD
北大核心
1993年第1期38-42,共5页
Rock and Mineral Analysis
关键词
钽
杂多酸
多元缔合物
碱度
tantalum,heterpoly acid,basic dyes,high sensitive colour reaction
