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f <br />• • • <br />concentration is approximately 58 (v/v) HC1. Transfer the <br />solution immediately to a plastic bottle for storage. <br />ANALYSIS. Determine the concentration of the elements of <br />interest by Atomic Absorption Spectrophotometry. Dilute <br />the sample solution, as necessary, with deionized water to <br />bring the concentration of the element(s) of interest into <br />a suitable concentration range. <br />CALCULATIONS. <br />Element (wt ~a) _ (r(g/ml in solution) (d.f.) (0.025) <br />Element (ppm) _ (~ g/ml in solution) (d.f.) (250) <br />where d.f. = final solution volume in ml <br />volume of original sample solution used in r~ <br />3) Analysis of soil pH as measured in water. <br />SAMPLE PREPERATION. Weigh 20 g of each sample into separate <br />50 ml beakers. Add 20 ml of water and stir for one-half hour. <br />Allow the solutions to stand for one hour and read pH directly <br />`rpm our meter. <br />III. Results: The element analysis of the soil samples revealed <br />some information about the suitability of the overburden soils <br />to be used as a foundation for re-establishing vegetation <br />around the U.S. Soil quarry site. See Table I. The concen- <br />tration of zinc was fairly uniform among the soil samples <br />analyzed. This could be indicative of the similarity of. <br />parent rock for soil formation. The sodium content of the <br />overburden from the west. and east side was higher than the <br />undisturbed areas. Sodium although needed in minute <br />quantities, is toxic to plant growth. Magnesium content was <br />uniform in the undisturbed soils, but the overburden on the <br />east side was higher, and the overburden from t}~e west side <br />was lower than the values for the undisturbed areas. <br />Potassium content was highest in the east side undisturbed <br />soil samples. Samples of the overburden from both areas and <br />the west side undisturbed area were lower. Iron content <br />showed no correlation with samples. The undisturbed areas <br />were 1.26 in the east sample and 1.05$ in the west samples. <br />'Phe overburdens were not similar either. It is apparent, <br />however, that the overburden samples were higher in iron <br />than the undisturbed areas. <br />Total aitrogen content for the soil samples w~ <br />interesting. The west side undisturbed sample had the <br />`iigltest concentration of nitrogen, with obviously more <br />organic matter than any of the other samples. The east side <br />overburden samples had the next highest concentration of <br />-3- <br />