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钯/碳催化剂中的微量铜是一种会降低催化活性的有害元素,因此铜的含量是钯/碳催化剂及其载体活性炭的一项质量控制指标。火焰原子吸收法测定极微量的铜,文献中一般采用APDC络合萃取的方法。但因钯严重干扰APDC对铜的络合萃取,故不能应用于钯/碳催化剂的测定。Allan曾探讨过有机溶剂对原子吸收法测定的影响,指出乙酸乙酯对铜有很强的增感效果。但由于该溶剂与水不互溶,因此仍需通过APDC络合萃取。本工作选择了可以与适量水互
The trace copper in palladium / carbon catalysts is a harmful element that reduces the catalytic activity, so the copper content is a quality control indicator for the palladium on carbon catalyst and its supported activated carbon. Flame atomic absorption method for the determination of trace amounts of copper, the literature generally used APDC complex extraction method. However, palladium can not be applied to the determination of palladium / carbon catalyst because palladium seriously interferes with APDC complex extraction of copper. Allan has explored the effect of organic solvents on the AAS determination, noting that ethyl acetate has a strong sensitizing effect on copper. However, due to the fact that the solvent is immiscible with water, complex extraction by APDC is still required. The work of choice and the right amount of water each other