Monitoring Sulphur Species and Metal Ions in Salt-Marsh Pore-Waters by Using an In-Situ Sampler

Ugo, Paolo; Bertolin, Andrea; Moretto, Ligia Maria

doi:10.1080/03067319908032657

Cited by 11 publications

(11 citation statements)

References 35 publications

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“…On the basis of previous results [7,16] the concentration range of iron in this kind of sample examined here (pore-waters of Venice lagoon sediments) is expected to be in the mM rather than in the nM range; for this reason cyclic voltammetry at the NCE was used for the analysis. On the basis of previous results [7,16] the concentration range of iron in this kind of sample examined here (pore-waters of Venice lagoon sediments) is expected to be in the mM rather than in the nM range; for this reason cyclic voltammetry at the NCE was used for the analysis.…”

Section: Application Of Ie-cv To Pore-waters Analysismentioning

confidence: 99%

Trace Iron Determination by Cyclic and Multiple Square-Wave Voltammetry at Nafion Coated Electrodes. Applicationto Pore-Water Analysis

et al. 2001

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Nafion coated glassy carbon electrodes (NCE) are employed for preconcentrating and detecting Fe2+ and Fe3+ cations from aqueous solutions. The influence of the supporting electrolyte composition and of the redox state on the analyte partitioning within the Nafion coating are examined. By using cyclic voltammetry, the ion‐exchange voltammetric determination of iron in the μM concentration range is achieved from voltammetric peak currents relevant to the reversible redox process: Fe3++e⇋Fe2+. Depending on the starting potential of the voltammetric scan, all the iron is initially converted to the Fe(III) or Fe(II) redox state, so that, from the voltammogram, the overall concentration of iron is always obtained. However, the simple measurement of the open circuit potential at the NCE before starting the scan allows one to get information on the ratio between Fe(III) and Fe(II) incorporated in the Nafion coating. From relevant ion‐exchange distribution coefficients, open circuit potential values can be related to the Fe(III)/Fe(II) concentration ratio in the sample. The use at the NCE of a new electroanalytical technique named multiple square‐wave voltammetry in the double differential mode allows the significative lowering of detection limits pushing the operative range of the method in the nM range. Application to analysis of Fe(II) in the pore‐waters of sediments of the lagoon of Venice (Italy) is presented.

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Section: Application Of Ie-cv To Pore-waters Analysismentioning

confidence: 99%

Trace Iron Determination by Cyclic and Multiple Square-Wave Voltammetry at Nafion Coated Electrodes. Applicationto Pore-Water Analysis

et al. 2001

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“…In contrast, the results of Reddy et al (1996) suggest that dissolved NH þ 4 transport from the surface 8 cm of sediment was due to sediment resuspension, and below this depth upward mobility of NH Hesslein (1976), and its modifications (Shaw and Prepas, 1989). More recently, a practical device that allows simultaneous and sequential sampling of porewater at different depths at the same location was described by Ugo et al (1999). In addition, porewater can be extracted by means of destructive methods such as pressure filtration, centrifugation and anaerobic centrifugation.…”

Section: Introductionmentioning

confidence: 99%

Novel use of soil moisture samplers for studies on anaerobic ammonium fluxes across lake sediment–water interfaces

et al. 2003

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“…The head The geochemical processes of porewater govern important aspects of all lake and oceanic water environments, most notably the spatial distribution, migration, and transformation of chemical substances at the sediment-water interface as well as the early diagenetic process within sediments [13]. As part of the effort to develop a better understanding of how these processes function, some researchers have used balance sampling devices to collect in-situ porewater, while others have used specially designed sediment collectors to harvest clay cores or superficial sediments that are then layered, centrifuged or filter pressed to extract the porewater [14,15]. For laboratory experiments, porewater is often acquired via an anaerobic centrifugation approach [8,16,17], but this approach relies on strict operational procedures and can only be conducted in a nitrogenous environment to avoid oxidization effects.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Usui et al [11] used 15 N as a tracer to monitor the fate of nutrients in sediments in the Tama estuary, Japan. By comparing changes in the level of N 2 O, they showed that increasing the concentrations of NO 3 − and DO in the overlying water stimulated nitrification and denitrification.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nonaerated Circulation Water Velocity on Nutrient Release from Aquaculture Pond Sediments

Cheng

Zhu

Wang

et al. 2016

Water

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Abstract:Sustaining good water quality in aquaculture ponds is vital. Without an aerator, the dissolved oxygen in ponds comes primarily from mass transfer at the water-ambient atmosphere interface. As sediment can seriously affect water quality, this study used indoor experiments to examine the nutrient (nitrogen and phosphorus) release mechanisms and fluxes from sediment in aquaculture ponds with moving water but no aeration. The results showed that the ammonia nitrogen (NH 3 -N) concentration in the overlying water was inversely proportional to flow velocity and that a higher flow velocity tended to result in a lower concentration in the overlying water, a steeper vertical gradient of concentration within the bed sediments, and a faster release rate from the sediments. The sediment disturbed by flowing water released more nitrate nitrogen (NO 3 -N) and nitrite nitrogen (NO 2 -N) into the overlying water and NO 2 -N could become oxidized into NO 3 -N. In still water, NO 3 -N was released gradually and some anaerobic NO 3 -N was nitrified into NO 2 -N. Phosphorus release from the sediments was controlled by the adsorption-desorption balance, with the phosphorus concentration in the overlying water dropping gradually to a steady value from its initial maximum. The relationship between NH 3 -N release flux and flow rate is described by a cubic function.

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Monitoring Sulphur Species and Metal Ions in Salt-Marsh Pore-Waters by Using an In-Situ Sampler

Cited by 11 publications

References 35 publications

Trace Iron Determination by Cyclic and Multiple Square-Wave Voltammetry at Nafion Coated Electrodes. Applicationto Pore-Water Analysis

Trace Iron Determination by Cyclic and Multiple Square-Wave Voltammetry at Nafion Coated Electrodes. Applicationto Pore-Water Analysis

Novel use of soil moisture samplers for studies on anaerobic ammonium fluxes across lake sediment–water interfaces

Effects of Nonaerated Circulation Water Velocity on Nutrient Release from Aquaculture Pond Sediments

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