【摘要】 本文研究在聚乙烯醇（PVA）存在下,铂与钼酸铵和丁基罗丹明B（BRB）形成离子缔合物,该缔合物的最大吸收位于570nm,摩尔吸光系数ε值为9.26×10⁵L·mol^-1·cm^-1,服从比耳定律范围0～3.0μg Pt/25ml,缔合物至少稳定3周。测定铂的条件为C_HClO4=1.4mol/L,C₍MoO₄^2-=1.1×10^-3mol/L,C_BRB=3.8×10^-5mol/L,0.08％PVA。考察了40多种共存离子的影响,除形成杂多酸的元素外,大多数不干扰。本法已用于催化剂和某些铂矿中铂的测定,结果较满意。更多还原

【Abstract】 Platinum (Ⅳ) reacts with ammonium molybdate and butyl rhodamine B (BRB) to form a ion associated complex in the presence of poly vinyl alcohol (PVA). The apparent molar absorptivity of the ion associated complex was found to be 9,26×10 5 L ?mol-1·cm-1at 570 nm, and it was stable for more than 3 weeks. Beer’s law is obeyed in the range of 0 to 3. 0 ×g/25 ml for platinum. The molar ratio of Pt(Ⅳ) to BRB was established to be 1: 2 by molar ratio method and equilibrium movement method. The optimum conditions for the determination of platinum (Ⅳ) are selected. Tolerable ammounts are reported for 48 foreign ions. The method is proved to be satisfactory for the determination of platinum (Ⅳ) in some minerals and catalysts.更多还原