【摘要】 以熔融萘作稀释剂,用3,4-二氨基苯甲酸测定Pt是一种有效的分光光度法。Pt与3,4-二氨基苯甲酸（DBA）在90℃生成蓝绿色的配合物,在pH 10.0～12.5范围内,配合物定量地被萃取进入熔融萘中。有机相溶解于无水CHCl₃中,在715nm处以试剂为空白测定其吸光度,在Pt浓度为（0.1～2.0）×10^-6mol/L范围内服从比耳定律。摩尔吸光系数和桑德尔灵敏度分别为1.2×10⁶L/mol·cm和0.00041mg/cm²。实验确定了操作条件,考察了各种干扰离子的影响,并测定了混合样品中的Pt含量。更多还原

【Abstract】 An effective spectrophotometric determination of platinum with 3,4-diamido-benzoic acid (DBA) using molten naphthalene as a diluent has been studied. A blue-green complex of platinum with DBA is formed at 90 ℃ In the range of pH 10. 0-12. 5, the complex is quantitatively extracted into molten naphthalene. The organic phase is anhydrously dissolved in CHC13 to be determined spectrophotometrically at 715 nm against the reagent blank. Beer’s law is obeyed over the concentration range of (0. 1 - 2. 0)×10-6. The molar absorptivity and Sandell’s sensitivity 1. 2×106 L/mol · cm and 0. 000 41 mg/cm2 respectively. The optimum conditions for determination are obtained. The interferences of various ions are observed in detail. The method has been applied to the determination of platinum in synthetic samples.更多还原