Abstract
Abstract The official volumetric method for phosphorus in fertilizers was modified to improve its accuracy and precision. Sulfate interference is eliminated by addition of excess nitric acid before precipitation of the molybdophosphate. The precipitate is filtered on a glassfiber pad, and when it is dissolved in alkali, formaldehyde is added to complex the ammonia; a mixed indicator (methyl green-phenolphthalein) is used that changes color at the equivalence point. The modified method passed Youden’s ruggedness test and gave results in excellent agreement with those of the gravimetric quinolinium method in analyses of standard phosphate rocks, primary phosphate standards, and fertilizers.
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