All chemicals used in this work were used as purchased without further purification. Isopropyl alcohol, glycerol, and ethylene glycol (ACS grade) were purchased from Macron. TEMPO (98%) and acetaldehyde (99.5%) were purchased from Sigma-Aldrich. Ethanol (USP grade) was purchased from Decon Labs. Trifluoroethanol (99%) was purchased from Acros Organics. Sodium hydroxide (Reagent grade) was purchased from Ward Science. 85 w/w% phosphoric acid (ACS grade) was purchased from Fischer Chemical. Sodium bicarbonate (ACS grade) was purchased from Avantor. Anhydrous sodium carbonate (ACS grade) and standard pH reference buffers (4.00, 7.00, 10.00) were purchased from VWR. DI water was obtained from a Milli-Q purification system.