Residue (chemistry)

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Residue" chemistry – news · newspapers · books · scholar · JSTOR (December 2020) (Learn how and when to remove this message)

In chemistry, residue is whatever remains or acts as a contaminant after a given class of events. Residue may be the material remaining after a process of preparation, separation, or purification, such as distillation, evaporation, or filtration. It may also denote the undesired by-products of a chemical reaction.

Residues as an undesired by-product are a concern in agricultural and food industries.