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于ｐＨ６７～７６的磷酸盐缓冲介质中，溴化十六烷基三甲铵存在下，Ｐｄ（Ⅱ）与５′＿硝基水杨基荧光酮３０ｍｉｎ内反应完全，生成组成比１∶２的紫红色配合物。λｍａｘ＝５８２ｎｍ，Δλ＝５６ｎｍ，表观ε为１０４×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，配合物至少稳定３６ｈ。测Ｐｄ（Ⅱ）的线性范围在０～０８０ｍｇ／Ｌ。结合丁二酮肟＿氯仿萃取分离，方法可用于试样中微量钯的测定，结果与５＿Ｂｒ＿ＰＡＤＡＢ光度法一致，标准加入回收率为９３２％～１００４％，相对标准偏差为１７％（ｎ＝１０）。
In pH6.7 ~ 76 phosphate buffer medium, cetyltrimethylammonium bromide in the presence of Pd (Ⅱ) and 5’-nitro-salicylfluorone reaction within 30min completely, the composition ratio of 1 : 2 purple complex. λmax = 582nm, Δλ = 56nm, apparent ε was 1.04 × 105L · mol-1 · cm-1, the complexes were stable for at least 36h. The linear range of Pd (Ⅱ) is 0 ~ 080 mg / L. Combined with dimethylglyoxime_ chloroform extraction and separation, the method can be used for the determination of trace palladium in the sample. The result is consistent with that of 5_Br_PADAB. The standard addition recoveries ranged from 932% to 1004% with a relative standard deviation of 17 % (N = 10).