Atrazine

A Nafion-117 cation exchange membrane for separating catholyte and anolyte was manufactured by Du Pont de Nemours & Co., Ltd. (Wilmington, DE, USA). A potentiostat providing direct current (DC) power was purchased from Shanghai Chenhua Science Technology Corp., Ltd., Shanghai, China. Unless otherwise specified, all chemical reagents were acquired from commercial suppliers and utilized without further purification. Sodium persulfate (PS, ≥99.5%), carbamazepine, norfloxacin, atrazine, phonel, methanol (99%), bisphenol A (BPA), sodium hydroxide (NaOH), atrazine, sulfuric acid (H₂SO₄), sodium sulfate (Na₂SO₄, ≥99.0%), Diammonium 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonate) (ABTS), potassium titanium (IV) oxalate, tert-butanol (TBA, 99%), and boron-doped diamond electrode (BDD) electrodes (800 ppm boron, bipolar, 1 mm coating thickness) were obtained from J&K Chemical (Beijing, China). Activated carbon fiber (ACF) electrodes and platinum-plated titanium electrodes (25 mm × 50 mm × 1 mm) were obtained from Shanxi Kaida Chemical Ltd., Lvliang, China. DC power supply was obtained from Zhejiang Sako Electrical Group Co., Ltd., Leqing, China.

Atrazine was purchased from J&K Scientific (Beijing, China), with its purity ≥ 98.8%. Methanol and formic acid were of HPLC grade and were purchased from J&K Scientific (Beijing, China) and Kermel Chemical Reagent Co., Ltd. (Tianjin, China), respectively. A Milli-Q water purification system (MilliporeSigma, Burlington, MA, USA) was employed. Atrazine was prepared as a stock solution of 20 mg/L. The stock solution was kept in reserve at 4 °C until use.
Main testing instruments: Ultra-high-performance liquid-chromatography electrospray triple-quadrupole mass spectrometer (UPLC–ESI–MS/MS, Waters, Milford, MA, USA); an ACQUITYTM UPLC BEN C8 chromatographic column (2.1 mm × 50 mm, 1.7 μm, Waters, Milford, MA, USA).