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Table XII7providcs Chc measured concentrations of <br />exchangeable Na+ and K+, obtained after extracting specimens • <br />of interburden iai.th 1.0 N ammonium acetate solution. It has <br />already been discussed how crater saturation percentages ([dSP) <br />(Table III) are a measure of the amount of water needed to <br />completely saturate a given soil sample. Ultimately, the <br />saturation percentage is used r_o c~iculate the concentration <br />of soluble cations and exchangeable cations which are extractable <br />from a given soil. Final results obtained by evaluating the <br />exchange data provide a measure of the sodium and potassium <br />cations that can be displaced from the soil matrix into solution <br />by other caater soluble cations, such as ammonium ions. These <br />results are also found in Table XVII. <br />Once the three pieces of evidence become available: <br />1. Electrical conductivity plus pH of extract solution. <br />2. Measurements of individual cation and anion concentrations <br />in solution. <br />3. ?•teasur,ments of exchangeable sodium and potassium <br />ions from a particular soil. <br />It is then possible to give a complete appraisal of the soil or <br />interburden relationship caith water. Soil salinity and alkalinity, <br />as well as the quantity and hind of soluble salts that can be <br />expected in surface runoff, can be determined. <br />Radioactivity measurements made on aqueous e:;tracts from <br />1;1 extraction of interburden are assembled in Tablesxxl and X};II <br />Table XXlcontains data fora + ~ counting activity and Ta61eXY,II <br />presents y counting activity. The results of these tests ar.e <br />treated in Section LC. <br /> <br />U <br />