Details
| Original language | English |
|---|---|
| Pages (from-to) | 11411-11420 |
| Number of pages | 10 |
| Journal | Environmental Science and Technology |
| Volume | 58 |
| Issue number | 26 |
| Early online date | 18 Jun 2024 |
| Publication status | Published - 2 Jul 2024 |
Abstract
Antimony (Sb) isotopic fractionation is frequently used as a proxy for biogeochemical processes in nature. However, to date, little is known about Sb isotope fractionation in biologically driven reactions. In this study, Pseudomonas sp. J1 was selected for Sb isotope fractionation experiments with varying initial Sb concentration gradients (50-200 μM) at pH 7.2 and 30 °C. Compared to the initial Sb(III) reservoir (δ123Sb = 0.03 ± 0.01 ∼ 0.06 ± 0.01‰), lighter isotopes were preferentially oxidized to Sb(V). Relatively constant isotope enrichment factors (ϵ) of −0.62 ± 0.06 and −0.58 ± 0.02‰ were observed for the initial Sb concentrations ranging between 50 and 200 μM during the first 22 days. Therefore, the Sb concentration has a limited influence on Sb isotope fractionation during Sb(III) oxidation that can be described by a kinetically dominated Rayleigh fractionation model. Due to the decrease in the Sb-oxidation rate by Pseudomonas sp. J1, observed for the initial Sb concentration of 200 μM, Sb isotope fractionation shifted toward isotopic equilibrium after 22 days, with slightly heavy Sb(V) after 68 days. These findings provide the prospect of using Sb isotopes as an environmental tracer in the Sb biogeochemical cycle.
Keywords
- antimony (Sb), isotope fractionation, kinetic-dominated, microbial oxidation, Sb(III)-oxidizing bacteria
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Environmental Science(all)
- Environmental Chemistry
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In: Environmental Science and Technology, Vol. 58, No. 26, 02.07.2024, p. 11411-11420.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Antimony Isotope Fractionation during Kinetic Sb(III) Oxidation by Antimony-Oxidizing Bacteria Pseudomonas sp. J1
AU - Jia, Xiaocen
AU - Kaufmann, Andreas
AU - Lazarov, Marina
AU - Wen, Bing
AU - Weyer, Stefan
AU - Zhou, Jianwei
AU - Ma, Liyuan
AU - Majzlan, Juraj
N1 - Publisher Copyright: © 2024 American Chemical Society.
PY - 2024/7/2
Y1 - 2024/7/2
N2 - Antimony (Sb) isotopic fractionation is frequently used as a proxy for biogeochemical processes in nature. However, to date, little is known about Sb isotope fractionation in biologically driven reactions. In this study, Pseudomonas sp. J1 was selected for Sb isotope fractionation experiments with varying initial Sb concentration gradients (50-200 μM) at pH 7.2 and 30 °C. Compared to the initial Sb(III) reservoir (δ123Sb = 0.03 ± 0.01 ∼ 0.06 ± 0.01‰), lighter isotopes were preferentially oxidized to Sb(V). Relatively constant isotope enrichment factors (ϵ) of −0.62 ± 0.06 and −0.58 ± 0.02‰ were observed for the initial Sb concentrations ranging between 50 and 200 μM during the first 22 days. Therefore, the Sb concentration has a limited influence on Sb isotope fractionation during Sb(III) oxidation that can be described by a kinetically dominated Rayleigh fractionation model. Due to the decrease in the Sb-oxidation rate by Pseudomonas sp. J1, observed for the initial Sb concentration of 200 μM, Sb isotope fractionation shifted toward isotopic equilibrium after 22 days, with slightly heavy Sb(V) after 68 days. These findings provide the prospect of using Sb isotopes as an environmental tracer in the Sb biogeochemical cycle.
AB - Antimony (Sb) isotopic fractionation is frequently used as a proxy for biogeochemical processes in nature. However, to date, little is known about Sb isotope fractionation in biologically driven reactions. In this study, Pseudomonas sp. J1 was selected for Sb isotope fractionation experiments with varying initial Sb concentration gradients (50-200 μM) at pH 7.2 and 30 °C. Compared to the initial Sb(III) reservoir (δ123Sb = 0.03 ± 0.01 ∼ 0.06 ± 0.01‰), lighter isotopes were preferentially oxidized to Sb(V). Relatively constant isotope enrichment factors (ϵ) of −0.62 ± 0.06 and −0.58 ± 0.02‰ were observed for the initial Sb concentrations ranging between 50 and 200 μM during the first 22 days. Therefore, the Sb concentration has a limited influence on Sb isotope fractionation during Sb(III) oxidation that can be described by a kinetically dominated Rayleigh fractionation model. Due to the decrease in the Sb-oxidation rate by Pseudomonas sp. J1, observed for the initial Sb concentration of 200 μM, Sb isotope fractionation shifted toward isotopic equilibrium after 22 days, with slightly heavy Sb(V) after 68 days. These findings provide the prospect of using Sb isotopes as an environmental tracer in the Sb biogeochemical cycle.
KW - antimony (Sb)
KW - isotope fractionation
KW - kinetic-dominated
KW - microbial oxidation
KW - Sb(III)-oxidizing bacteria
UR - http://www.scopus.com/inward/record.url?scp=85197094690&partnerID=8YFLogxK
U2 - 10.1021/acs.est.3c10271
DO - 10.1021/acs.est.3c10271
M3 - Article
C2 - 38887934
AN - SCOPUS:85197094690
VL - 58
SP - 11411
EP - 11420
JO - Environmental Science and Technology
JF - Environmental Science and Technology
SN - 0013-936X
IS - 26
ER -