碘蓝分光光度法测定微量铬(Ⅵ)

Determination of Trace Cr(Ⅵ) by Iodine-Blue Spectrophotomerty

基于在酸性介质中 ,重铬酸钾与碘化钾、淀粉的显色反应 ,建立了碘蓝分光光度法测定微量铬 ( )的方法。铬 ( )浓度在 0— 0 .6μg/ m L范围内有良好的线性关系 ,方法的相对标准偏差为 1.3% ,表观摩尔吸光系数为 5 .6 3× 10 4 L· mol- 1 · cm- 1 ,检出限为 2 .0× 10 - 3μg/ m

Based on the colour reaction of Cr(Ⅵ) with KI in the presence of starch, a spectrophotometric method for determination of trace Cr(Ⅵ) was developed.Beers law is obeyed in the range of 0- 0.6μg/mL of Cr(Ⅵ) with detection limit of 2.0×10 -3 μg/mL.