研究了新试剂 2 - (H酸偶氮 ) - 4,5 -二硝基酚 (HADNP)与铝的显色反应 ,在pH5 .3的六次甲基四胺 -盐酸缓冲介质中 ,HADNP与Al3+生成 3比 1的紫色络合物 ,λmax=5 70nm ,ε =3 .2 9× 10 4 L·mol-1·cm-1,Al质量浓度在 0～ 480 μg·L-1内符合比尔定律 ,方法用于水样测定 ,结果满意 The color reaction of 2 - (H - azo) - 4,5 - dinitrophenol (HADNP) with aluminum was studied. In the hexamethylenetetramine - hydrochloride buffer medium at pH5.3, the reaction of HADNP with Al3 + generated a purple complex with a ratio of 3 to 1, λ max = 5 70 nm, ε = 3.29 × 10 4 L · mol -1 · cm -1 and the Al concentration was in the range of 0-480 μg · L -1 Law, method for the determination of water samples, the results are satisfactory