华东师范大学有机合成研究室刘恒椽同志最近合成的变色酸不对称双偶氮衍生物——偶氮硝膦-mA(学名为2-(4-硝基-2膦酸苯偶氮)-7-(3乙酰基苯偶氮)-1.8二羟基-3.6萘二磺酸。偶氮硝膦-mA是一个新的轻稀土显色剂,试剂水溶液在545nm处有最大吸收,与稀土形成兰紫色络合物在660nm处有最大吸收。显色反应瞬间完成,试剂和络合物在24小时内维持稳定,反应灵敏度高(ε=7.5×10~4、Sandell=0.00187μg/cm~2),比耳定律范围为0～15μg/25ml。该试剂作为铈组稀 East China Normal University Organic Synthesis Laboratory Comrade Liu Hengqian recently synthesized chromotropic acid asymmetric disazo derivatives - azo nitronazo-mA (scientific name 2- (4-nitro-2-phosphonophenylazo) -7 - (3 Acetylphenylazo) -1.8 Dihydroxy-3.6 naphthalenedisulfonic acid Azo nitrophosphine-mA is a new light rare earth color reagent, reagent aqueous solution has maximum absorption at 545nm, with the formation of purple orchid The maximum absorption of the complex at 660 nm was achieved.The chromogenic reaction was completed instantly and the reagents and complexes remained stable within 24 hours with high sensitivity (ε = 7.5 × 10 -4, Sandell = 0.00187 μg / cm 2) Beer’s law range 0 ~ 15μg / 25ml. This reagent as a thin cerium group