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1浸提条件pH为8.5,浸提温度为25±1℃,土液比为1∶20,震荡时间:30±1 min。震荡频率:180～200次/min。2显色条件2.1酸度与钼酸铵试剂的浓度:常用的比色液中钼酸铵试剂的浓度为0.1%;酸度为0.45 mol/L。2.2显色时温度。室温:15℃。2.3显色时间。显色时间30 min,蓝色稳定24 h。3干扰的消除主要是NaHCO3浸出液中有机质颜色的干扰。
1 leaching conditions of pH 8.5, the extraction temperature of 25 ± 1 ℃, soil-liquid ratio of 1:20, shaking time: 30 ± 1 min. Oscillation frequency: 180 ~ 200 times / min. 2 color conditions 2.1 Acidity and ammonium molybdate reagent concentration: Commonly used colorimetric liquid ammonium molybdate reagent concentration of 0.1%; acidity of 0.45 mol / L. 2.2 color temperature. Room temperature: 15 ℃. 2.3 color development time. Coloring time 30 min, blue stable 24 h. 3 interference is mainly the elimination of organic matter in NaHCO3 leachate color interference.