DETERMINATION OF PHOSPHORUS IN ORGANIC COMPOUNDS ON THE CENTIMILLIGRAM SCALE.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
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Samples, of average weight less than 100 micrograms, are decomposed in a sulphuric-perchloric acid mixture in an open tube. The quantity of phosphate formed is measured by the absorbance of the phosphovanadomolybdate complex at 315 micrograms. Results are usually within or - 0.3 absolute of the calculated value. Solids and involatile, non-hygroscopic liquids, some containing Br, F, N or Si, were successfully analysed, but some fluorinated compounds resist acid attack. Advantages and disadvantages of the determination of phosphate by Uv absorption are discussed. Author
- Inorganic Chemistry