ISO 21033:2016规定了测定油中微量元素含量的电感耦合等离子体光发射光谱法（ICP-OES）。根据使用的稀释溶剂，可以分析大多数类型的植物油（原油、脱胶油、精炼油、漂白油、脱臭油和硬化油）以及几乎所有类型的卵磷脂和磷脂。牛奶和奶制品（或来自牛奶和奶制品的脂肪）不在本国际标准的范围内。 该方法仅适用于元素以溶解形式存在的情况。细颗粒，如白土、金属颗粒和铁锈，可能会导致微量元素回收不良，因为雾化和原子化问题会影响ICP-OES分析。 请注意唯一合适的非- 灰化直接法是石墨炉原子吸收光谱法。

ISO 21033:2016 specifies an inductively coupled plasma optical emission spectroscopic method (ICP-OES) for the determination of the trace element content in oils. Depending on the dilution solvent used, most types of vegetable oils can be analysed (crude, degummed, refined, bleached, deodorized and hardened oils) and nearly all types of lecithins and phosphatides. Milk and milk products (or fat coming from milk and milk products) are excluded from the scope of this International Standard. This method is only suitable when the elements are present in a solubilized form. Fine particles, such as bleaching earth, metal particles and rust, can result in poor recovery of the trace elements present as nebulization and atomization problems affect the ICP-OES analysis. NOTE The only suitable non-ashing direct method for samples containing fine particles is graphite furnace atomic absorption spectrometry.