Trace NO2- in H3PO4 solution has been studied. It catalyzes the decolorization reaction of neutral red (NR) by oxidizing H2O2 in H3PO4 . Its catalytic extent is linear with the contents of NO2- .

• 研究了在H3PO4溶液中痕量NO2-对H2O2氧化中性红的褪色反应有催化作用,催化程度与NO2-量线性相关。