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在磷酸介质中，在过量碘化钾及聚乙烯醇（ＰｖＡ）存在下；锰（Ⅶ）氢化Ｉ￣（－）生成配阴离子，再与结晶紫（ＣＶ）阳离子形成离子综合物，由于氧化－还原反应的倍增作用和染料阳离子本身的高摩尔吸光系数，使显色反应具有很高的灵敏度，ε值达２．２０×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）．方法世具有较好的选择性，经铜试剂萃取分离后可用于水和某些食品中痕量锰的测定．
In the presence of excess potassium iodide and polyvinyl alcohol (PvA) in phosphoric acid medium, the hydrogenation of manganese (Ⅶ) leads to anions which react with the crystal violet (CV) cations to form ionic complexes. Due to the oxidation-reduction reaction And the high molar extinction coefficient of the dye cation make the color reaction have high sensitivity and the ε value reaches 2.20 × 10-5L · mol -1 -1 cm -1. Method World has better selectivity, after copper reagent extraction and separation can be used for determination of trace amounts of manganese in water and certain foods.