以5-（5-碘-2-吡啶偶氮）-2，4-二氨基甲苯（5-I-PADAT）为络合剂，以聚乙二醇辛基苯基醚（Triton X-114）为萃取剂，采用石墨炉原子吸收光谱法测定环境水样中痕量铜。优化的试验条件如下：①乙酸-乙酸钠缓冲溶液的pH为5.3；②1.0×10^-3mol·L^-1 5-I-PADAT溶液的用量为0.25 mL；③ 10 g·L^-1 Triton X-114溶液的用量为1.0 mL；④水浴加热时间为15 min；⑤水浴加热温度为60℃；⑥0.1 mol·L^-1硝酸-甲醇溶液的用量为70 μL。铜的质量浓度在1.0~14 μg·L^-1内与其对应的吸光度呈线性关系，检出限（3s/k）为0.216 μg·L^-1。方法用于2种环境水样的分析，加标回收率为102%，100%，测定值的相对标准偏差（n=6）为4.5%，4.3%。

GFAAS was applied to the determination of trace amount of copper in environmental water samples with 5-(5-iodine-2-pyridylazo)-2,4-diaminotoluene (5-I-PADAT) as complexing agent and p-octyl polyethylene glycol phenyl ether (Triton X-114) as extracting agent. The optimized conditions found were as follows:①pH of buffer solution of acetic acid and sodium acetate:5.3; ② amount of 1.0×10^-3mol·L^-1 5-I-PADAT solution:0.25 mL; ③ amount of 10 g·L^-1 Triton X-114 solution:1.0 mL; ④water bath heating time:15 min;⑤ water bath heating temperature:60℃; ⑥ amount of 0.1 mol·L^-1 HNO₃-methanol solution:70 μL. Linear relationship between values of absorbance and mass concentration of copper was obtained in the range of 1.0-14 μg·L^-1, with detection limit (3s/k) of 0.216 μg·L^-1. The proposed method was applied to the analysis of 2 environmental water samples, giving values of recovery of 102%, 100%, and values of RSD's (n=6) of 4.5%, 4.3%.