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1 引言 本文研究了在0.05mol/L H_2SO_4-NH_4~+pH为2·3的体系中,钽(Ⅵ)与6-Br-BTAP(6-Br-2苯并噻唑-偶氮-邻苯二酚)。在滴汞电极上络合极谱波的性质,其配合比为1∶1,证明是一种络合吸附波,在上述体系中,选择了合适的实验条件,得到了一个极为灵敏的导数极谱波,其峰电位为-1.20V(vs.SCE,下同),峰电流与钼(Ⅳ)的浓度在0.5～260μg/L范围内呈良好的线性关系,还研究了近20种共存离子的影响,尤其是用其他方法对钼测定干扰较大的钒(V),钨(Ⅳ)、铁(Ⅲ)等离子,实验证明无多大干扰,故可不经分离,直接测定,经对钢样中钼的测定证明,结果满意。
1 Introduction In this paper, the effect of tantalum (Ⅵ) and 6-Br-BTAP (6-Br-2 benzothiazole-azo- phenol). The complexation of polarographic wave on the drop mercury electrode with a mixing ratio of 1: 1 proved to be a complex adsorption wave. In the above system, the suitable experimental conditions were selected and a very sensitive derivative pole The peak potential was -1.20V (vs.SCE, the same below). The peak current was in good linear relationship with the concentration of molybdenum (Ⅳ) in the range of 0.5-260μg / L. Nearly 20 kinds of coexisting ions In particular, vanadium (V), tungsten (IV) and iron (III) ions, which interfere with the determination of molybdenum by other methods, have been proved to have little interference. Therefore, it can be directly measured without separation and can be used in steel samples Molybdenum determination proved satisfactory.