以1-亚硝基-2-萘酚为萃取剂, 以90℃熔融萘作稀释剂萃取痕量钯 (Ⅱ), 萘相中钯经氯仿溶解后用光度法测定其含量. 实验条件下络合物能从pH=0.8～11.0范围内定量萃入萘中, 络合物波长λmax=440 nm, 摩尔吸光系数ε440=2.41×104 L.mol-1.cm-1, 组成比Pd∶HR=1∶2, 萃取反应平衡常数Kex=6.31×1011. 钯量在0.48～34 μg/10 ml范围内符合朗伯-比耳定律, 检测限为0.044 μg/10 ml. 同时确定了光度法测定的最佳条件及常见阴阳离子的干扰允许量. 利用该法进行合成样与实际样中钯含量的测定, 结果满意.
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