Question: Is it vegetable oil or mineral oil?
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The sample is a light yellow oily liquid with a pH of 3–4 and a relative density of 0.87–0.89. When water is dropped on this substance, a white substance precipitates. Infrared analysis shows that this white substance has a 94% similarity to palm wax. I would appreciate it if everyone could help analyze what this substance is. Thank you!
Infrared analysis has already shown a similarity level; it should be vegetable oil. Mineral oil generally does not contain oxygen, whereas vegetable oil is actually a glyceride of long-chain carboxylic acids, and its molecules contain oxygen. Infrared spectroscopy can be used to determine whether carbonyl groups are present in the sample; if they are, then it is a vegetable oil, or contains vegetable oil ； If there is no carbonyl absorption, it can be determined to be mineral oil. The oxygen content determined by elemental analysis can also be used for judgment.
It’s just palm oil; mix it with diesel in the right proportions and it can be sold