采用Pd-Rh化学基体改进剂，建立了石墨炉原子吸收光谱法（GFAAS）间接测定游离氨基酸的新方法．本方法基于磷酸铜悬浮液与氨基酸发生络合反应生成铜-氨基酸络合物，铜络合物可以采用GFAAS进行测定，而后根据铜-氨基酸络合物中的铜与氨基酸的摩尔比，依据铜的浓度计算出氨基酸的浓度．实验考察了多种金属离子化合物与氨基酸的反应，最终选择了硫酸铜悬浮液．实验选择Pd-Rh化学基体改进剂做铜的稳定剂，热解温度可以达到1630℃．在最佳实验条件下，成功地测定了氨基酸注射液中游离氨基酸含量，回收率为92%～108%．
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