本文研究了在 Mn( )存在下新试剂二安替比林对碘苯基甲烷 (DAp IM)与 Cr( )反应生成桔红色配合物 ,λmax为 4 88nm,表观摩尔吸收系数 ε=2 .0 5× 10 5L.mol-1.cm-1,Cr( )含量在 0— 8.0 μg/ 2 5 m L范围内符合比耳定律 ,线性回归方程为 A=0 .0 2 65 +0 .141C(μg/ 2 5 m L) ,r=0 .9974 ,方法用于电镀废水中铬的测定 ,结果令人满意 In this paper, the new reagent diantipyryl dinitration methane (DAp IM) reacted with Cr () in the presence of Mn (superscript 3 +) to form orange complex with λmax of 488 nm and apparent molar absorptivity of ε = 2. Beer’s law was obeyed in the range of 0 ~ 8.0 μg / 25 m L with 0 5 × 10 5 L · mol -1 · cm -1 and the linear regression equation was A 0 0.265 +0.141 C (μg / 2 5 m L), r = 0.9974, the method was applied to the determination of chromium in electroplating wastewater with satisfactory results