Obtain a sample of solution from the tank and allow to cool to near room temperature (20-25°C) 从槽液中取样，并冷却至近室温(20-25°C) Using a pipette, transfer exactly 10.00 mls of the solution in to a 150 ml beaker and add 90 ml distilled water.用吸液管抽取10.00mls的溶液移至150ml的烧杯 中，加入90ml蒸馏水。 Using a 1.0N NaOH solution, titrate the sample to pH 8, and record the mls used.用1.0N NaOH溶液滴定至PH8，记录消耗的mls数。
Calculation: C=Vt * T / Vs * 0.606 * 100%
C = % 发动机清洗剂 Vt = Volume titrated NaOH (ml) T = Concentration Titre (N NaOH) Vs = Volume sample (ml)
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