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17 minutes 2.6 percent 20 minutes 4-2 Flotation product 70-percent nitric acid 95-percent confidence limits accuracy acid leach acid solution Add 10 milliliters Albany Metallurgy Research alkalimetric method ammonium molybdate reagent ammonium phosphomolybdate precipitate beaker best fitting linear Bureau of Mines C. P. Mabie carbonate fluorapatite centrifuging concentrate CONTENT OF SEDIMENTARY correlation described method Determination of Phosphorus ESTIMATING PHOSPHORUS PENTOXIDE Exponential Calibration Curve exponential equation filter paper filtration grams H. D. Hess linear and exponential linear equation Mabie and H. D. Metallurgy Research Center method described METHOD FOR ESTIMATING milliliter Goetz tubes milliliters of ammonium Mineral molybdate solution Oreg Pa0B percent P205 petrographic phate phos Phosphorus in Bronze PHOSPHORUS PENTOXIDE CONTENT PI 4-2 Flotation plot precipitate method precipitate volumes quantities of phosphorus Report of investigations roasted at 700 room temperature samples sedimentary phosphate rock SIMPLE CHEMICAL METHOD stirring study indicates tails tap water U. S. Dept volume determinations western phosphate