QTANDARD treatises give procedures for the precipitation of ^manganese from concentrated nitric acid solutions by potassium chlorate as a "separation" method in its determination (1, 2). The author has found this precipitation an excellent manganese "removal" method in determining zinc, calcium, and magnesium contents of high-manganese ores and products. This method does not require the double precipitation necessary in basic ammoniacal precipitations using bromine, ammonium persulfate, hydrogen peroxide, or a combination of ammonium persulfate and hydrogen peroxide, which has proved to be the best ammoniacal precipitation for these samples.
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