Salt bridge for field redox potential measurements

Veneman, P. L. M.; Pickering, E. W.

doi:10.1080/00103628309367398

Cited by 27 publications

(10 citation statements)

References 11 publications

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“…In order to avoid clogging by KCl crystals, the use of unsaturated KCl solution such 3 M KCl as the bridge solution should be advantageous. These suggestions agree well with the used salt bridge outlined by VENEMAN & PICKERING (1983).…”

Section: E H At a Depth Of 14 Msupporting

confidence: 78%

Redox: fundamentals, processes, and applications

Schüring¹,

Schulz²,

Böttcher³

et al. 2000

Choice Reviews Online

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Section: E H At a Depth Of 14 Msupporting

confidence: 78%

Redox: fundamentals, processes, and applications

Schüring¹,

Schulz²,

Böttcher³

et al. 2000

Choice Reviews Online

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“…Platinum redox electrodes (Faulkner et al, 1989) were permanently installed in all 32 columns at 5‐, 15‐, and 30‐cm depths, connected to a computer via a multiplexer, and read automatically every 4 h. Columns were connected by a salt bridge with two saturated calomel reference electrodes located centrally (Veneman and Pickering, 1983). Redox potential (Eh) was estimated from measured electrode potential by adding 244 mV (Stumm and Morgan, 1996).…”

Section: Methodsmentioning

confidence: 99%

Temperature and Wetland Plant Species Effects on Wastewater Treatment and Root Zone Oxidation

Allen¹,

et al. 2002

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Constructed wetlands are widely used for wastewater treatment, but there is little information on processes affecting their performance in cold climates, effects of plants on seasonal performance, or plant selection for cold regions. We evaluated the effects of three plant species on seasonal removal of dissolved organic matter (OM) (measured by chemical oxygen demand and dissolved organic carbon) and root zone oxidation status (measured by redox potential [Eh] and sulfate [SO4(2-)]) in subsurface-flow wetland (SSW) microcosms. A series of 20-d incubations of simulated wastewater was conducted during a 28-mo greenhouse study at temperatures from 4 to 24 degrees C. Presence and species of plants strongly affected seasonal differences in OM removal and root zone oxidation. All plants enhanced OM removal compared with unplanted controls, but plant effects and differences among species were much greater at 4 degrees C, during dormancy, than at 24 degrees C, during the growing season. Low temperatures were associated with decreased OM removal in unplanted controls and broadleaf cattail (Typha latifolia L.) microcosms and with increased removal in beaked sedge (Carex rostrata Stokes) and hardstem bulrush [Schoenoplectus acutus (Muhl. ex Bigelow) A. & D. Löve var. acutus] microcosms. Differences in OM removal corresponded to species' apparent abilities to increase root zone oxygen supply. Sedge and bulrush significantly raised Eh values and SO4(2-) concentrations, particularly at 4 degrees C. These results add to evidence that SSWs can be effective in cold climates and suggest that plant species selection may be especially important to optimizing SSW performance in cold climates.

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“…Sulphate and chloride concentrations were determined by ion chromatography using a Dionex Ion Pac 1 AS17C column preceded by an AG17 guard-column. Redox conditions within the VFCW pilot were monitored by a method described by Veneman and Pickering (1983) using redox probes and the salt bridge. The salt bridge was made by filling 1.25 cm diameter Plexiglas 1 pipes with saturated KCl agar-agar gel (3%).…”

Section: Sampling and Analysesmentioning

confidence: 99%

Influence of the water saturation level on phosphorus retention and treatment performances of vertical flow constructed wetland combined with trickling filter and FeCl3 injection

Kim

Gautier

Molle³

et al. 2015

Ecological Engineering

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International audienceThe aim of the study was to determine the effects on treatment efficiency of oxidation-reduction (redox) conditions that are caused by different water saturation levels within vertical-flow constructed wetlands (VFCW), with specific attention to phosphorus (P) retention. The study was conducted by monitoring over 18 weeks a pilot-scale system consisting of a biological aerobic trickling filter as a biological pre-treatment step, followed by ferric chloride (FeCl3) addition for phosphate removal and a stage of VFCW. By adjusting the water saturation level, the VFCW was operated successively under fully unsaturated, partly saturated, completely saturated (flooded), and then again unsaturated conditions. Redox potentials (Eh) were measured at three different levels within the VFCW. Results revealed that Eh was logically affected by the water-saturation level and the feeding-resting periods. Treatment efficiency was very good under fully unsaturated and partly saturated conditions. Under flooded conditions, the performance of the filter declined when the flood was maintained for around one week. However, VFCW regained its previous efficiency after the effluent was drained out and aerobic conditions were restored, indicating that the system was resistant and robust enough that periodical flooding did nott affect its performance afterwards

show abstract

Salt bridge for field redox potential measurements

Cited by 27 publications

References 11 publications

Redox: fundamentals, processes, and applications

Redox: fundamentals, processes, and applications

Temperature and Wetland Plant Species Effects on Wastewater Treatment and Root Zone Oxidation

Influence of the water saturation level on phosphorus retention and treatment performances of vertical flow constructed wetland combined with trickling filter and FeCl3 injection

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