Geological Survey Professional Paper Volume 751 by Geological Survey
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Author: Geological Survey
Number of Pages: 52 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231314470
File size: 49 Mb
Download Link: Geological Survey Professional Paper Volume 751
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. Excerpt: ...liter and a total sulfur-species content of 4.4x10-'M (equivalent to a sulfate content of 4.2 mg/1). The boundaries of fields containing dissolved ferrous iron were drawn for two Fe+2 concentrations--1.8X10-6M and 1.8x10" '"M--equal to 0.1 mg/1 and 1.0 mg/1 iron, respectively. The two boundaries bracket the values of iron concentration in water from the Bay Park wells and also indicate the magnitude of changes in dissolved-iron concentration with Eh and pH changes. The system shown in figure 13 is for a temperature of 15 C, the average temperature of the Magothy water at Bay Park. The Van't Hoff equation was used to convert the standard free energies at 25 C to the free energies at 15C. In the calculation, dH/dt was assumed equal to zero. Though not rigorously true, the assumption should introduce only negligible errors when the departure from the standard temperature is only 10C. The values of Ah and AG" used in these calculations are given by Latimer (1952). Of several Eh values measured for water from each well, the most negative one is probably the most accurate one. The ranges of all measurements are indicated by the length of vertical lines on figure 13, as is the probable precision of the lowest individual measurement. Figure 13 shows that the Magothy water at Bay Park is below the stability field of hematite (Fe203). Hematite is the most stable of the various ferric oxide and hydroxide species likely in the oxidizing part of the aquifer near the recharge area. The fact that even hematite is unstable in the Bay Park water means that no solid ferric species are likely in the aquifer there. Unlike the iron content of many ground waters (Oborn and Hem, 1962; Barnes and Back, 1964), the iron content of the ground water at Bay Park is not contro...
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