(99.9%), glacial acetic acid (100%), sodium hypochlorite (NaClO, 6–14%
active chlorine), TEMPO (99%), and potassium hydroxide (KOH, pellets,
≥85%) were purchased from Sigma-Aldrich, Sweden AB. 95% sulfuric
acid and sodium hydroxide (NaOH, pure pellets) were purchased from
Merck KGaA, Germany. Sodium chlorite (NaClO2, high purity,
chlorite content of 77.5%–82.5%), a 0.1 M standardized NaOH
solution, and a 0.5 M standardized hydrochloric acid (HCl) solution
were purchased from VWR, Sweden. All chemicals were used without any
further purification.