Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Schitz, Darrel W.

Committee Member

Kirkland, Brenda L.

Committee Member

Martin, James L.

Committee Member

McNeal, Karen S.

Date of Degree

1-1-2014

Document Type

Graduate Thesis - Open Access

Abstract

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.

URI

https://hdl.handle.net/11668/16572

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