I will be determining the total phenolic content using Folin Ciocalteu assay. However, I am having difficulty in determining the category of the waste generated. In previous researchers, they categorized the waste similar with the extract. For example, if they are using an ethanolic extract as a sample, the waste generated from the assay is categorized as ethanolic and can be under "Non halogenated organic solvents". However, in my case, the extracts are aqueous in nature.