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Measurement of total dissolved phosphorus in small volumes of iron rich interstitial water |
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| Authors: | René Gächter André Tessier Erno Szabo Richard Carignan |
| Institution: | (1) Institute of Aquatic Sciences (EAWAG), Swiss Federal Institute of Technology (ETH), CH 6747 Kastanienbaum, Switzerland;(2) INRS-Eau, Université du Québec, C.P. 7400, GIV 4C7 Sainte-Foy, Québec, Canada;(3) Swiss Federal Institute for Water Resources and Water Pollution Control (EAWAG), CH-8600 Dübendorf, Switzerland |
| Abstract: | It is shown that sorption of orthophosphate to iron compounds, formed during persulfate digestion, can cause a significant underestimation of total dissolved phosphorus in interstitial waters rich in iron and poor in phosphorus. Labelling the samples with carrier free32PO4 before digestion allows to correct for these losses. |
| Keywords: | Sediment interstitial water phosphorus iron persulfate digestion |
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