Undergraduate Thesis Or Project
 

Relationships among soil pH, redox potential, and ferrous iron content data obtained from various field and lab methods

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  • Relationships among soil pH, redox potential, and ferrous iron content data obtained from various field and lab methods were determined, with the following 4 objectives: 1.) Compare pH values obtained in the field to those obtained in the lab 2.) Evaluate different methods to measure pH in field 3.) Determine the relationship between Eh and field pH 4.) Determine Eh threshold at which iron reduction occurs Statistical analyses showed there was a significant difference between field and lab pH methods. Further analysis using orthogonal contrasts revealed no significant difference among the field methods. The values obtained from objectives 3 and 4 were compared to previously accepted literature values. We determined the Eh-pH relationship value was -136 mV per unit of pH. This value lies in between the empirical value of -59 mV per pH unit and the theoretical value of -177 mV per pH unit. There is currently a debate among soil researchers as to which of the values to utilize when normalizing Eh readings to pH 7. Therefore, a value specific to the soil being measured, as we calculated, is very beneficial. The iron reduction threshold was found to be lower than the previously reported accepted range of +300 to +100 mV before and after being normalized to pH 7. The values were found to be +275 mV before pH normalization and +130 mV after pH normalization.
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  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR.
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