Single reagent method for the spectrophotometric determination of phosphorus in silicates
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 104 (1245) , 1124-1128
- https://doi.org/10.1039/an9790401124
Abstract
A method has been developed for the spectrophotometric determination of phosphorus in silicate rocks following fusion with a lithium borate flux and dissolution of the melt in dilute nitric acid. By using a single reagent incorporating antimony and relatively high concentrations of ascorbic acid and hydroxylammonium chloride, a stable colour has been achieved. The colour is fully developed within 30 min and is stable for up to 4 h in solutions containing up to 0.8 µg ml–1 of phosphorus(V) oxide with nitric acid concentrations not greater than 0.04 N. Beer's law is obeyed and ε= 22200 at 880 nm.Keywords
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