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研究了一个新的三氮烯类试剂 :1 (间硝基苯基 ) 3 (2 氨基噻唑 )三氮烯 (m NPATT) ,在Tween80存在下与钯 显色反应。结果表明 ,在pH 8 0～ 10 0范围内 ,钯 与m NPATT形成 1∶2的稳定络合物 ,其表观摩尔吸光系数在 475nm处为 6 82× 10 4 。钯量在 0 10～ 10 0 μg/ 10mL范围内符合比尔定律。对 30多种共存离子进行了试验 ,除Cu2 +,Ag+,Cd2 +,Hg2 +稍有干扰外 ,其余离子均不干扰测定。用该方法测定了催化剂中钯的含量 ,结果满意。
A new triazene reagent, m NPATT, was studied for its color reaction with palladium in the presence of Tween80. The results showed that palladium complexed with m NPATT at pH 8 0 ~ 10 0 to form a stable complex with an apparent molar absorptivity of 6 82 × 10 4 at 475 nm. Beer’s law was obeyed in the range of 0 10 ~ 100 μg / 10mL. More than 30 kinds of coexisting ions were tested, except for Cu2 +, Ag +, Cd2 + and Hg2 +. The rest of the ions did not interfere with the determination. The method was used to determine the content of palladium in the catalyst with satisfactory results.