Sodium acetate anhydrous

Paracetamol 98% purity purchased from Sigma-Aldrich was used as model pollutant. Reagent-grade hydrogen peroxide 33% w/v from Panreac and iron sulfate (FeSO₄·7H₂O) from Merck adopted as the ferrous ion (Fe²⁺) source, were used to perform all the experiments. HPLC gradient grade methanol, MeOH, purchased from J.T. Baker and filtered Milli Q grade water were used as HPLC mobile phases. High-purity (> 99%) ascorbic acid from Riedel de Haën, 0.2% 1,10-phenanthroline from Scharlab, and sodium acetate anhydrous and 95%–98% sulfuric acid, both from Panreac, were used to perform iron species measurements. In order to adjust the initial pH to the optimal one (2.8 ± 0.1), hydrogen chloride HCl 37% from J.T. Baker was used. Distilled water was used as water matrix in all experiments.

Quercetin (purity ≥ 95%, Bangalore, Karnataka, India) and iron (III) chloride hexahydrate (purity ≥ 99%, Taufkirchen, Germany) were purchased from Sigma-Aldrich (Saint Louis, MO, USA). Dipotassium hydrogen phosphate anhydrous (purity ≥ 98%), potassium dihydrogen phosphate (purity ≥ 98%), sodium acetate anhydrous (purity ≥ 99%), hydrochloric acid (HCl, 37%), thiobarbituric acid (purity ≥ 98%), 1-butanol (purity ≥ 99.5%), and formic acid (FA, purity ≥ 98%) were purchased from PanReac AppliChem (Darmstadt, Germany). Furthermore, 2,4,4-tris(2-pyridyl)-1,3,5-triazine (TPTZ, purity ≥ 96%) was purchased from BLDpharm (Shanghai, China). Acetic acid (purity ≥ 99.8%) and ortho-phosphoric acid (purity ≥ 85%) were purchased from Component-Reaktiv (Moscow, Russia). Sodium thiosulfate standard titer was purchased from LLC Himtitry (Pereslavl-Zalessky, Russia). Starch indicator and sodium sulphate anhydrous were purchased from Himmed (Moscow, Russia). Acetic acid was purchased from Labtech (Moscow, Russia), and potassium iodide was purchased from Reahim (Moscow, Russia). Deionized water for chromatography (18 W) was obtained using a Milli-Q Merck water purification system (Millipore, Darmstadt, Germany).