Determination of Pharmaceutical Residues by UPLC-MS/MS Method: Validation and Application on Surface Water and Hospital Wastewater

Figure 4

Stability of target compounds in three thawing-freezing cycles at 10 µg L⁻¹ (low concentration); 200 µg L⁻¹ (middle concentration); 500 µg L⁻¹ (high concentration).