The determination of total phosphorus in seawater by nitrate oxidation of the organic component

A method is presented for the determination of total phosphorus dissolved in seawater by magnesium nitrate oxidation of the organic component concomitant with depolymerization of polyphosphate residues, followed by the standard molybdate colorimetric determination of the liberated orthophosphate. Th...

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Bibliographic Details
Published in:Water research (Oxford) 1986-01, Vol.20 (9), p.1197-1199
Main Authors: Cembella, A.D., Antia, N.J., Taylor, F.J.R.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
nitrate oxidation
organic phosphorus
phosphonates
seawater
Spectrometric and optical methods
total dissolved phosphorus
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Summary:A method is presented for the determination of total phosphorus dissolved in seawater by magnesium nitrate oxidation of the organic component concomitant with depolymerization of polyphosphate residues, followed by the standard molybdate colorimetric determination of the liberated orthophosphate. This method gave 93–100% recovery of phosphorus from inorganic metaphosphate and polyphosphate, phosphate esters and anhydrides, nucleotide-P, phospholipid and phosphonates. It is shown to be superior to the perchlorate-oxidation or high-intensity u.v.-irradiation methods for quantitative P recovery from phosphonates and polyphosphates, while proving equal in P recovery to the autoclave-requiring persulfate-oxidation method.
ISSN:0043-1354
1879-2448
DOI:10.1016/0043-1354(86)90067-9