On the Apparent Redox Reactivity of “Oxygen-Enriched Water”

Pușcaș, Cristina; Moldovan, Mărioara; Silaghi-Dumitrescu, Laura; Ungureanu, Lavinia; Silaghi‐Dumitrescu, Radu

doi:10.1007/s12011-020-02056-4

Cited by 2 publications

(1 citation statement)

References 30 publications

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“…The chemistries and hydrological conditions of the water body affect the mobility and species of redox sensitive elements, and thus affect the water quality [44,45]. The concentrations of S(-II), phosphate and As(V) in sample W1 were 15.50, 24.62 and 8.53 µg L −1 , respectively (Table 2), which represent the characteristics of a common water body.…”

Section: Measurement Of Labile Concentrations Of Multi-elements In Field Waters Using Ldh S -Dgt Probementioning

confidence: 99%

Development and Applications of an In Situ Probe for Multi-Element High-Resolution Measurement at Soil/Sediment-Water Interface and Rice Rhizosphere

et al. 2021

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The biogeochemistry of multi-elements, such as sulfur (S), phosphorus (P) and arsenic (As), is interlinked especially at interfaces of soil/sediment–water and plant rhizosphere. To explore the biogeochemical behavior of multi-elements such as S-P-As at interfaces, an in situ and high-resolution technology is required. In this study, we developed an in situ probe (LDHs-DGT) based on the diffusive gradients in thin-films technique using a single binding layer to realize the co-measurement of multi-elements including sulfide and oxyanions. Mg-Al layered double hydroxides (LDHs) were synthesized and incorporated into the probe’s binding layer. Laboratorial characterization showed that the LDHs-DGT probe had a high capacity for sulfide, phosphate and arsenate and can effectively determine their levels across a wide range of solution conditions, i.e., pH from 5 to 8 and ionic strengths from 0.005–0.01 mol L−1 NaNO3. The application potential of the LDHS-DGT probe in capturing the concentration profiles of sulfide and oxyanions across the soil/sediment–water interface at a centimeter scale was demonstrated. The synchronous co-variations of labile sulfide and phosphate were observed along an intact river sediment core, demonstrating the redox driven behaviors of oxyanions at aerobic–anaerobic transition zones. Moreover, the LDHS-DGT probe was further used to acquire the dynamic distributions of multi-elements in the plant rhizosphere at a two-dimensional millimeter scale. Compared to treatments of sodium sulfate and mercaptopygorskite fertilization, the addition of elementary S promoted the reduction of sulfate to sulfide along the whole growth stage and thus inhibited the activation of toxic metals in the rice rhizosphere. Collectively, this study provides a tool for convenient measurement of nutrients and metal(loid)s across soil–water/root interfaces at high resolution and thus, a broad application prospect of the tool in sustainable agriculture is expected.

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Section: Measurement Of Labile Concentrations Of Multi-elements In Field Waters Using Ldh S -Dgt Probementioning

confidence: 99%

Development and Applications of an In Situ Probe for Multi-Element High-Resolution Measurement at Soil/Sediment-Water Interface and Rice Rhizosphere

et al. 2021

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Water of Increased Content of Molecular Oxygen

Chwastowski

Ciesielski

Khachatryan

et al. 2020

Water

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Deionized and tap water were saturated with molecular oxygen either prior to (WST), or after (WTS), treatment with low-temperature, low-pressure glow plasma of low frequency (LPGP) for 0, 5, 15, 30, 60, 90, and 120 min. Physical and physicochemical properties of the resulting liquids were characterized, involving pH, conductivity, density, dissolved molecular oxygen, active oxygen content, differential scanning calorimetry (DSC), ultraviolet-visible (UV-VIS), Fourier transformation infrared-attenuated total reflectance (FTIR-ATR), electronic spin resonance (ESR), and Raman spectroscopies. Tap WST treated with LPGP for 30 min contained the highest level of dissolved molecular oxygen, compared to original non-treated tap water (23 and 15 mg/L, respectively). Essential differences in all investigated properties of LPGP treated tap and deionized WST, compared to those for corresponding WTS, pointed to the indispensable role of dissolved oxygen molecules in building water macrostructure. In the case of tap WST, formation of niches and/or caverns hosting anions (HCO3−, SO4=) was accompanied by cations less enveloped by hydroxyl groups of water. The WST water contained niches of larger size, hosting molecules of oxygen interacting with the environment in various manners. In WTS there was a priority for single donor, single hydrogen bonded water, and free water in building the macrostructure. Such macrostructures host molecular oxygen which, depending on the LPGP treatment time, took either a singlet of triplet state.

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On the Apparent Redox Reactivity of “Oxygen-Enriched Water”

Cited by 2 publications

References 30 publications

Development and Applications of an In Situ Probe for Multi-Element High-Resolution Measurement at Soil/Sediment-Water Interface and Rice Rhizosphere

Development and Applications of an In Situ Probe for Multi-Element High-Resolution Measurement at Soil/Sediment-Water Interface and Rice Rhizosphere

Water of Increased Content of Molecular Oxygen

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