Sulfide perturbation of NOM-bearing oxic environments induces dark •OH production

Sulfide perturbation of NOM-bearing oxic environments induces dark •OH production

The photo-irradiation of natural organic matter (NOM) is a well-documented pathway of •OH production in surface waters. Using humic acid (HA) as a model compound, we show that the perturbation of NOM-bearing oxic environments by naturally occurring reduced species, sulfide, contributes to •OH produc...

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Veröffentlicht in:Chemical geology 2022-12, Vol.613, p.121147, Article 121147
Hauptverfasser: Niyuhire, Elias, Zhou, Chexin, Hu, Bingbing, Cai, Qizheng, Yuan, Songhu
Format: Artikel
Sprache:eng
Schlagworte:
Humic acid
Hydroxyl radicals
Oxygen
Perturbation
Sulfide
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Zusammenfassung:The photo-irradiation of natural organic matter (NOM) is a well-documented pathway of •OH production in surface waters. Using humic acid (HA) as a model compound, we show that the perturbation of NOM-bearing oxic environments by naturally occurring reduced species, sulfide, contributes to •OH production under dark conditions. Sulfide concentration had a more prominent influence on •OH production than HA. When HA was controlled at 16 mM C under oxic and neutral pH conditions, the increase of sulfide concentration from 0 to 5 mM increased the cumulative •OH concentration from
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2022.121147