Ratiometric fluorescence determination of phoxim in traditional Chinese medicine matrices using Astragalus residue-derived carbon dots and rhodamine B.
An internally referenced fluorescence method was developed for the determination of phoxim in traditional Chinese medicine matrices. Astragalus residue-derived carbon quantum dots (AR-CQDs) were prepared from Astragalus residue and urea by one-step hydrothermal treatment and combined with Rhodamine B (RhB) to form a du...