Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 56, Issue 6, Pages 3386-3396Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c03796
Keywords
hydrogen peroxide; radical scavenger; hydroxyl radical; oxygen reduction; photolysis
Categories
Funding
- Shenzhen Science and Technology Innovation Commission [JCYJ20210324121403010]
- National Natural Science Foundation of China [51978194]
- University of Cincinnati through the Herman Schneider Professorship in the College of Engineering and Applied Sciences
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The study found that alcohols have an impact on the reliability of ·OH detection, possibly making the traditional ·OH determination method unreliable or misleading. Through careful investigation, an overlooked reaction pathway during H2O2 and ·OH transformations was revealed, showing that varying oxygen concentrations, pHs, alcohol dosages, and types can affect H2O2 formation, which in turn affects the accuracy of ·OH determination.
Hydroxyl radical (center dot 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 center dot OH determination. However, the impacts of alcohols on the reliability of center dot 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 center dot OH precursor. This means that the conventional center dot OH determination method using alcohols is likely unreliable or even misleading. Through careful investigation, we revealed an overlooked reaction pathway during H2O2 and center dot OH transformations. Varying oxygen concentrations, pHs, alcohol dosages, and types altered H2O2 formation, which can affect center dot OH determination accuracy. Among alcohols, n-butanol is the best scavenger because it quenches center dot OH rapidly but re-forms little H2O2.
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