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研究了新显色剂2_四唑偶氮_5_二乙氨基酚 (TTZAPN)分光光度法测定Pd2 +的条件。在 pH5.0的HAc -NaAc介质中 ,该试剂与Pd2 +形成稳定的摩尔比为2∶1的紫红色络合物。其最大吸收波长在530nm处 ,表观摩尔吸光系数为4.51×104L·mol -1·cm -1 ,Pd2 +质量浓度在0～1.0mg/L范围内遵守比尔定律。所拟方法直接测定钯 -碳催化剂和分子筛中微量钯 ,结果令人满意。
The new reagent 2_ tetrazolium_5_ diethylamino phenol (TTZAPN) spectrophotometric determination of Pd2 + conditions. This reagent forms a magenta complex with Pd2 + in a 2: 1 molar ratio in HAc-NaAc media at pH 5.0. The maximum absorption wavelength is 530nm, the apparent molar absorptivity is 4.51 × 104L · mol -1 · cm -1, and Beer’s law is obeyed in the range of 0 ~ 1.0mg / L for Pd 2+. The proposed method for the direct determination of palladium on carbon catalyst and molecular sieve trace palladium, the results are satisfactory.