Overlooked Formation of H2O2 during the Hydroxyl Radical-Scavenging Process When Using Alcohols as Scavengers.
Environ Sci Technol
; 56(6): 3386-3396, 2022 03 15.
Article
em En
| MEDLINE
| ID: mdl-35230098
ABSTRACT
Hydroxyl radical (â¢OH) is an active species widely reported in studies across many scientific fields, and hence, its reliable analysis is vitally important. Currently, alcohols are commonly used as scavengers for â¢OH determination. However, the impacts of alcohols on the reliability of â¢OH detection remain unknown. In this study, we found that adding different types and different amounts of alcohols in water samples treated with ultraviolet irradiation undesirably produced substantial amounts of hydrogen peroxide (H2O2), which is a known â¢OH precursor. This means that the conventional â¢OH determination method using alcohols is likely unreliable or even misleading. Through careful investigation, we revealed an overlooked reaction pathway during H2O2 and â¢OH transformations. Varying oxygen concentrations, pHs, alcohol dosages, and types altered H2O2 formation, which can affect â¢OH determination accuracy. Among alcohols, n-butanol is the best scavenger because it quenches â¢OH rapidly but re-forms little H2O2.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Radical Hidroxila
/
Peróxido de Hidrogênio
Idioma:
En
Revista:
Environ Sci Technol
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
China