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本法研究了在聚乙烯醇（ＰＶＡ）存在下，钯与钼酸铵和乙基罗丹Ｂ（ＥＲＢ）反应形成的有色离子缔合物用于微量钯的光度法测定。缔合物的最大吸收位于５８０ｎｍ，表观摩尔吸收系数ε为２．１３×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，钯量在０－５．５μｇ／２５ｍＬ范围内服从比耳定律。体系至少稳定１４０ｈ，检出限（３σ）８．６４μｇ／Ｌ（ｎ＝１１），对０．２０ｍｇ／ＬＰｄ（Ⅱ）测定的相对标准偏差为２．６６％（ｎ＝１２）。缔合物的摩尔比为Ｐｄ∶ＥＲＢ＝１∶４。考查了５０多种共存离子的影响。本法用于炭基和铝基催化剂中微量钯的测定，结果满意。
This method was developed for the spectrophotometric determination of trace palladium with the presence of polyvinyl alcohol (PVA) in the presence of palladium and ammonium molybdate and ethylrhodamine B (ERB). The maximum absorption of the association at 580nm, the apparent molar absorption coefficient ε was 2.13 × 105L · mol-1 · cm-1, palladium content in the range of 0-5.5μg / 25mL obey Beer’s law. The system was stable at least for 140 h with a detection limit (3σ) of 8.64 μg / L (n = 11) and a relative standard deviation of 2.66% (n = 12) for the 0.20 mg / L PD (Ⅱ) assay. The molar ratio of association was Pd: ERB = 1: 4. Examined the impact of more than 50 kinds of coexisting ions. The method is applied to the determination of trace palladium in carbon-based and aluminum-based catalysts with satisfactory results.