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• VII. ANALYSES Techniques for aqueous extraction of soluble salts from coal seam interburden are described in Section VI, under AOl1E0US E\TRACTION PROCEDURES. Four extraction methods, each different, were employed when preparing leachates for analytical tests. The reason for using four different methods is the multitude of answers needed to assess the effects which arise when disturbed interburden is leached by water and is accompanied by surface runoff. 1:1 - Solids:idater Extract After extracting interburden or soils with water, all extract solutions were immediately filtered to remove suspended solids before proceeding with analytical tests. After filtration, the volume of recovered filtrate was measured; its temperature, pH e^.d COl1dLCt1`71ty were also measured and recorded. When • these preliminary tests were finished, each filtrate ;uas then transferred to a 250-m1 volumetric flask, an anti-precipitant for CaC03 added, and each solution diluted to its final volume. Follot•ring dilution, a 100-m1 portion of each extract :aas tested for dissolved ida~, K+, Cam, and Mgt content by flame and atomic absorption photometry--the sodium and potassium values represent soluble alkali cations. The second portion, 150 ml, was tested for phosphorus by a colorimetric method, ammonium ion by ion-selective electrode, nitrate and nitrite, anions by cadmium reduction to ammonia, then measurement of NH4+ by ion- selective electrode, carbonate and bicarbonate by acid titration, chloride by Volhard method, sulfate anion by barium precipitation and fluoride by ion-selective electrode. Exchan^eable Sodium and Potassium Extracts Peasurement of the exchangeable sodium and potassium in . the interburden matrix was performed after first extracting the two cations from the interburden caith 1.0 N ammonium acetate solution. Later, sodium and potassium concentrations in t-he