Visual assessment of redoxcline compared to electron potential in coastal marine sediments. (15th March 2017)

• Record Type: Journal Article
• Authors: Simone, Michelle; Grant, Jon
• Is Part Of: Estuarine, coastal and shelf science. Volume 188(2017)
• Page Start: 156
• Page End: 162
• Publication Date: 2017-03-15
• Subjects: Apparent redox potential discontinuity -- Redox potential -- Sediment profile imaging -- Coastal marine sediments; Estuarine oceanography -- Periodicals; Coasts -- Periodicals; Estuarine biology -- Periodicals; Seashore biology -- Periodicals; Coasts; Estuarine biology; Estuarine oceanography; Seashore biology; Periodicals; 551.461805
• DOI: 10.1016/j.ecss.2017.02.021
• Languages: English
• ISSNs: 0272-7714

Abstract

Abstract: A geochemical proxy often utilized in marine benthic health assessment is the depth of the apparent redox potential discontinuity (aRPD), a visual signature representing the transition from lighter oxidized to darker reduced sediments. Traditionally this boundary is defined by the redox potential discontinuity (RPD), a 0 mV isovolt measured by platinum electrodes. In order to verify the use of visual transitions as a proxy for electrochemical RPD, these measurements were compared in subtidal sandy muds (13.5 m depth) in coastal Nova Scotia, Canada. The apparent RPD was measured from sediment profile imagery (SPI) images and diver-retrieved cores. Pre-drilled cores with vertical holes allowed for the coupling of electrochemical and visual boundary measurements in the same sample. The mean discrepancy of the RPD is 0.6 ± 2.6 cm (mean ± maximum variation) above the aRPD depth. The Eh range at the aRPD, −14.94 ± 52.21 mV, encompassed the 0 mV isovolt, suggesting the aRPD can be applied as a sound proxy for the transition between redox states.