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A Single-Solution Method for the Determination of Soluble Phosphate in Sea Water

Published online by Cambridge University Press:  11 May 2009

J. Murphy  and
J. P. Riley
J. Murphy
Affiliation:
Department of Oceanography, The University, Liverpool
J. P. Riley
Affiliation:
Department of Oceanography, The University, Liverpool
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Extract

It has been found that a reagent containing sulphuric acid, ammonium molybdate and ascorbic acid may be used as a single-solution reagent for the determination of phosphate in sea water. Development of the molybdenum-blue colour is complete in 24 h at room temperature and in 30 min at 60° C; the colour is stable for at least 3 days. Beer's law is obeyed closely up to at least 500 μg PO43−-P/1. The salt error is approximately 4% with sea water of chlorinity 19·3%. The interference due to either arsenate or silicate at their concentrations in sea water is negligible.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 37 , Issue 1 , February 1958 , pp. 9 - 14
Copyright
Copyright © Marine Biological Association of the United Kingdom 1958

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