It can be an economical and effective method for extracting naphthenic acids from the heavy oil fractions of Xinjiang crude oil.
这可能是从新疆石油重质馏分中提取环烷酸的一种经济、有效方法。
2
Low molecular organic acids are commonly present and become an important factor in affecting transformation and transfer of heavy metals in environment.
低分子有机酸普遍存在于自然环境中，其与重金属阳离子的螯合作用是环境中重金属迁移转化的重要影响因素。
3
Isotope analysis for authenticity, juice quality and hygiene testing, mycotoxins, organic acids, sugars, heavy metals and elements analysis.