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Diffusive Gradients in Thin Film (DGT): a Proposed Method to Find Geochemical Predictors of Sediment Oxygen Demand

Sediment Oxygen Demand (SOD) is the fluctuation of dissolved oxygen between the sediment from the overlying water. The method to acquire SOD values is inefficient and troubled by unreliable equipment. Diffusion gradients in thin film (DGT) are proposed as a potential method to collect geochemical proxy measures that can be used as SOD predictors. Field deployment of the DGTs was conducted at two locations to compare recovery and accuracy against ex-situ centrifuge methods. The results indicated DGT can be used as a statistically significant geochemical method. A principle component analysis was used to determine if reduced iron and manganese collected using DGTs clustered with SOD. Results indicated reduced iron and manganese cannot be used to predict SOD. Sulfide measurement by microelectrode from the same matrix of geochemical methods however did cluster with SOD. A stepwise multiple linear regression concluded sulfide measurement by microelectrode is a statistically significant predictor of SOD.

Identiferoai:union.ndltd.org:MSSTATE/oai:scholarsjunction.msstate.edu:td-2503
Date17 May 2014
CreatorsGeroux, Jonathon Michael
PublisherScholars Junction
Source SetsMississippi State University
Detected LanguageEnglish
Typetext
Formatapplication/pdf
SourceTheses and Dissertations

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