标准摘要
[中文适用范围]: 本标准规定了水果、蔬菜及其衍生产品中苯甲酸含量的测定方法。 由于氯苯甲酸具有抗氧化性,因此该方法不能在对氯苯甲酸存在的情况下应用,因为该酸的吸收光谱与苯甲酸的吸收光谱接近。 也不能在肉桂酸存在下使用,肉桂酸通过铬酸氧化转化为苯甲酸。 注:本方法测定的肉桂酸为苯甲酸,一般仅以微量形式存在于蔬菜中,因此对所得结果没有影响,但肉桂皮含量较高的情况除外。 [外文原描述]: ISO 5518:2007 specifies a method for determining the benzoic acid content of fruits, vegetables and derived products. As chlorobenzoic acids are resistant to oxidation, the method cannot be applied in the presence of p -chlorobenzoic acid, as the absorption spectrum of this acid is close to that of benzoic acid. Neither can it be used in the presence of cinnamic acid, which is transformed into benzoic acid by chromic acid oxidation.
英文名称Fruits, vegetables and derived products — Determination of benzoic acid content — Spectrophotometric method