Iron at the helm: steering arsenic speciation through redox processes in soils

Environmental Research, Год журнала: 2025, Номер unknown, С. 121327 - 121327

Опубликована: Март 1, 2025

Язык: Английский

---

Effect mechanism of low-molecular-weight organic acids during sulfidation of As(V)-bearing ferrihydrite

Environmental Pollution, Год журнала: 2025, Номер 372, С. 126031 - 126031

Опубликована: Март 12, 2025

Язык: Английский

---

In Situ Reduction of Fe(III) (Hydr)oxides‐Bound As(V) via Electron Shuttling in the Presence of Organic Matter

Journal of Geophysical Research Biogeosciences, Год журнала: 2025, Номер 130(3)

Опубликована: Фев. 28, 2025

Abstract Although the reduction of pentavalent arsenic (As(V)) bound to Fe(III) (hydr)oxides (As(V)‐containing FeOOH) coupled with organic matter (OM) degradation has received extensive attention, little is known about in situ FeOOH mineral‐bound As(V) (As(V) (s) ) via electron shuttling presence As(V)‐reducing bacteria (AsRB). Here, anthraquinone‐2,6‐disulfonate (AQDS), Suwannee River humic acid (SRHA), and fulvic (SRFA) were used establish an agar shuttle system ferrihydrite‐As(V)/goethite‐As(V) AsRB, which was isolated from high‐As groundwater as candidate strain (RA‐1). We found that AQDS more efficient electrons reduce than SRHA SRFA. High contents quinone moieties indicated conducive reduction. The kinetic rates ( K red higher those Fe(III), indicating occurrence shuttling. Furthermore, for ferrihydrite‐As(V) systems greater goethite‐As(V) systems, demonstrating ferrihydrite monodentate easily reduced goethite bidentate. relative expression levels As metabolic genes ars C, arr A, B) initially increased then decreased late stage experiments. concentrations suspension inhibited transcriptional activity stage, reducing production efficiency RA‐1 subsequently slowing . This study highlights importance OM , offering new perspectives enrichment groundwater.

Язык: Английский

---

Effects of glomalin-related soil protein on soil selenium availability in farmland: a non-negligible component of organic matter

Journal of Hazardous Materials, Год журнала: 2025, Номер 493, С. 138405 - 138405

Опубликована: Апрель 24, 2025

Язык: Английский

---

Effect of Rotation Speed and Fulvic Acid Concentration on Biogenic Secondary High-Iron Mineral Synthesis

Water, Год журнала: 2024, Номер 16(15), С. 2092 - 2092

Опубликована: Июль 25, 2024

From an engineering standpoint, investigating the effects of rotation speed and fulvic acid concentration on development secondary high-iron minerals is crucial for treating mine drainage. The Fe2+ oxidation mechanism by Acidithiobacillus (A.) ferrooxidans to synthesise was examined in this study using shaking flask tests under various conditions: concentrations 0, 0.2, or 0.4 g/L speeds 180 r/min 100 r/min. pH, rate, total iron precipitation mineral functional groups ore equivalent indicators were also investigated. results demonstrated that at a 0 g/L, pH decreased from 2.5 2.17 At 0.2 it 2.05. Finally, 2.07. completely oxidised after 48 h, final rate ranged 26.2% 33.4%. synthesised uniformly dispersed solution. When r/min, reduced 2.25 2.14 2.19 g/L. Notably, within 72 h. experiment’s 23.6 29.6%. blocky adhered bottom flask. In summary, experimental group with higher than those control A enhanced activity A. ferrooxidans. obtained these experiments characterised identified as schwertmannite jarosite.

Язык: Английский

---

The impact of the structural transformation mechanism of fulvic acid on redox capacity during composting with different biowastes

Environmental Research, Год журнала: 2024, Номер unknown, С. 120539 - 120539

Опубликована: Дек. 1, 2024

Язык: Английский

---