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研究了新试剂4－（H酸偶氮）－1－苯基－3－甲基吡唑啉酮（HAPMP）与铁的显色反应，在pH7的NH4Ac缓冲介质中，CTMAB存在下，HAPMP与Fe（Ⅲ）生成3：1的紫色络合物．λmax=610nm，ε=7．68×104，铁含量在0～10μg/25mL内符合比尔定律，方法用于水样和镁合金中铁的测定．结果满意．
The color reaction of the new reagent 4- (H-azo) -1-phenyl-3-methylpyrazolone (HAPMP) with iron was studied. In the NH4Ac buffer medium of pH7, Fe (III) generates a 3: 1 purple complex. λmax = 610nm, ε = 7.68 × 104, Beer’s law is obeyed in the range of 0 ~ 10μg / 25mL. The method is applied to the determination of iron in water sample and magnesium alloy. Satisfactory results.