A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Biogenic Fenton process : A possible mechanism for the mineralization of organic carbon in fresh waters (2021)


Vähätalo, A. V., Xiao, Y., & Salonen, K. (2021). Biogenic Fenton process : A possible mechanism for the mineralization of organic carbon in fresh waters. Water Research, 188, Article 116483. https://doi.org/10.1016/j.watres.2020.116483


JYU-tekijät tai -toimittajat


Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajatVähätalo, Anssi V.; Xiao, Yihua; Salonen, Kalevi

Lehti tai sarjaWater Research

ISSN0043-1354

eISSN1879-2448

Julkaisuvuosi2021

Volyymi188

Artikkelinumero116483

KustantajaElsevier

JulkaisumaaBritannia

Julkaisun kielienglanti

DOIhttps://doi.org/10.1016/j.watres.2020.116483

Julkaisun avoin saatavuusEi avoin

Julkaisukanavan avoin saatavuus

Julkaisu on rinnakkaistallennettu (JYX)https://jyx.jyu.fi/handle/123456789/78290


Tiivistelmä

To explore the mechanisms that mineralize poorly bioavailable natural organic carbon (OC), we measured the mineralization of OC in two lake waters over long-term experiments (up to 623 days) at different pH and iron (Fe) levels. Both the microbial and photochemical mineralization of OC was higher at pH acidified to 4 than at the ambient pH 5 or an elevated pH 6. During 244 days, microbes mineralized up to 60% of OC in the 10-µm filtrates of lake water and more than 27% in the 1-µm filtrates indicating that large-sized microbes/grazers enhance the mineralization of OC. A reactivity continuum model indicated that the acidification stimulated the microbial mineralization of OC especially in the later (>weeks) phases of experiment when the bioavailability of OC was poor. The reactive oxygen species produced by light or microbial metabolism could have contributed to the mineralization of poorly bioavailable OC through photochemical and biogenic Fenton processes catalyzed by the indigenous Fe in lake water. When Fe was introduced to artificial lake water to the concentration found in the study lakes, it increased the densities of bacteria growing on solid phase extracted dissolved organic matter and in a larger extent at low pH 4 than at pH 5. Our results suggest that in addition to the photochemical Fenton process (photo-Fenton), microbes can transfer poorly bioavailable OC into labile forms and CO2 through extracellular Fe-catalyzed reactions (i.e., biogenic Fenton process).


YSO-asiasanathiilen kiertoliuennut orgaaninen hiilimineralisaatiojärvetmikrobitkemialliset reaktiotrauta

Vapaat asiasanatbiogenic Fenton; iron; microbes; organic carbon; reactive oxygen species; reactivity continuum.


Liittyvät organisaatiot


Hankkeet, joissa julkaisu on tehty


OKM-raportointiKyllä

Raportointivuosi2021

JUFO-taso3


Viimeisin päivitys 2024-22-04 klo 19:58