该方法适用于酸度等于或大于0.0008%（m/m）的产品。其原理是用无二氧化碳的水稀释试验部分，检查试验溶液是否为碱性或酸性至酚酞，如果合适，用标准体积氢氧化钠溶液滴定测定酸度。酸度以乙酸的质量百分比表示。-国际标准ISO 1388/1至1388/12取消并取代了ISO建议R 1388-1970，这些标准构成了技术修订版。

The method is applicable to products having acidities equal to or greater than 0.0008 % (m/m). The principle consists in the dilution of a test portion with carbon dioxide-free water, checking whether the test solution is alkaline or acid to phenolphthalein, and, if appropriate, determination of the acidity by titration with standard volumetric sodium hydroxide solution. The acidity is expressed as a percentage by mass of acetic acid. - International Standards ISO 1388/1 to 1388/12 cancel and replace ISO Recommendation R 1388-1970 of which they constitute a technical revision.