定各样品的总光密度值 Integrated Optical Density ; IOD
本文采用国家标准方法——酚试剂分光光度法对成都50多处房屋室内的甲醛浓度及其变化规律作了具体的分析，结果显示，总样品甲醛平均浓度为0。
Using the national standard method-folin spectrophotometry, this paper makes detailed analysis of the concentration and the changing law of formaldehyde existing in the 50 more houses in Chengdu.
以鲜榨菠萝汁为样品，建立了测定果汁总酸的自动电位滴定法。
With fresh pineapple juice as a sample, the automatic potentionmetric titration was established to analyze the total acidity in the fruit juices.
方法：以药典法测定不同精制工艺样品的总固体含量，用高效液相色谱法测定有效成分大黄酚的含量。
Methods: the solid compositions of different samples were determined by the methods adopted in pharmacopeia, and the chrysophanol content was determined by HPLC.
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