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采用2,4一二硝基苯肼比色法。检出下限0.5～0.8μg/ml。标准偏差0.23,回收率99.1～101.4％,分析条件容易控制,分析迅速。
Using 2,4-dinitrophenylhydrazine colorimetry. Detection limit of 0.5 ~ 0.8μg / ml. The standard deviation of 0.23, recovery rate of 99.1 ~ 101.4%, easy to control the analysis conditions, rapid analysis.