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1·The method was based on the catalytic effect of nitrite ion on the oxidation fading reaction of methyl orange and bright green with potassium bromate as oxidant in phosphoric acid medium.

在磷酸介质中，利用亚硝酸根催化溴酸钾氧化亮绿和甲基橙褪色的指示反应，建立催化光度法测定痕量亚硝酸根的新方法。

2·The effects of proportional application of cake fertilizer and chemical fertilizer on leaf nitrate, nitrite and potassium of flue-cured tobacco were investigated in a field experiment.

通过大田试验，研究了饼肥与化肥配施对烤烟硝酸盐、亚硝酸盐及钾素的影响。