An improved sodium salicylate-hypochlorite, automated method for ammonium in soil extracting solutions using nitroprusslde as catalyst has been investigated. This method is 2 to 3 times more sensitive than previously published procedures and also is less subject to interferences, has less noise in the signal, and has two alternative ranges. The range with maximum sensitivity is linear to about 2.5 ppm; the second range is linear to 9 ppm. The procedures and instrumentation are simple for both ranges.
Abstract. Fresh mine spoil at a pH of 3.84 was collected and transferred to leachate columns in early August 1988. The spoil was leached weekly with simulated precipitation at pH values of 5.6, 5.0, 4.6, 4.2, and 3.8. Control samples of mine spoil were simultaneously leached with distilled water at a pH of 6.47. Leachate was collected and analyzed by standard methods for cations, anions, conductivity, and pH. The cations and anions of major interest were iron, aluminum, manganese, and sulfate. The leachate initiallY was pH 2
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