1：Experimental Design and Method Selection:

The study used a UV/PMS advanced oxidation process to degrade HANs, with comparisons to UV alone, PMS alone, and UV/H2O2. Kinetic studies followed pseudo-first-order models, and mechanisms were explored through scavenging experiments and product analysis.

2：Kinetic studies followed pseudo-first-order models, and mechanisms were explored through scavenging experiments and product analysis. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: HANs (MCAN, DCAN, TCAN, DBAN) were used as pollutants, with initial concentrations of 2 μM or 20 μM in aqueous solutions. Water matrices like humic acid, Cl-, and HCO3- were added to study their effects.

3：List of Experimental Equipment and Materials:

A tubular reactor with a low-pressure mercury lamp (254 nm, GPH212T5L/4, 10 W, Heraeus), magnetic stirrer, water bath system, GC-ECD (Shimadsu 2010Plus), GC/MS (Agilent 7890), ion chromatograph (Metrohm 881 Compact/ ICpro), ESR spectrometer (Bruker A300), and various chemicals including PMS, H2O2, humic acid, ethanol, TBA, etc.

4：Experimental Procedures and Operational Workflow:

Solutions were prepared with deionized water, pH adjusted to 7.0 with phosphate buffer. The UV lamp was turned on after adding PMS and HANs, and samples were collected at intervals, extracted with MTBE, and analyzed by GC-ECD or other methods. Radicals were identified using ESR with spin-trapping reagents.

5：0 with phosphate buffer. The UV lamp was turned on after adding PMS and HANs, and samples were collected at intervals, extracted with MTBE, and analyzed by GC-ECD or other methods. Radicals were identified using ESR with spin-trapping reagents. Data Analysis Methods:

5. Data Analysis Methods: Data were analyzed using pseudo-first-order kinetics, with rate constants calculated. Statistical analysis included standard deviations from duplicated tests. Product identification used GC/MS and ion chromatography.