ISO 6598:1985

Fertilizers — Determination of phosphorus content — Quinoline phosphomolybdate gravimetric method

The method consists in precipitating, after hydrolysis if necessary, of orthophosphate ions in the form of quinoline phosphomolybdate, in an acid medium and in the presence of acetone, at approximately 75 °C, followed by filtrating, washing drying and weighing of the precipitate obtained.

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