The bioavailability of colloidal and dissolved organic phosphorus to the alga Pseudokirchneriella subcapitata in relation to analytical phosphorus measurements
| Autor: | Christoff Van Moorleghem, Roel Merckx, Nynke De Schutter, Erik Smolders |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Hydrobiologia. 709:41-53 |
| ISSN: | 1573-5117 0018-8158 |
| DOI: | 10.1007/s10750-013-1442-8 |
| Popis: | The speciation of phosphorus (P) in freshwater affects its bioavailability. Analytical detection methods were compared for different colloidal and dissolved organic forms of phosphorus (P) in relation to the potential P bioavailability to Pseudokirchneriella subcapitata, determined with a 14 day growth response to P. Growth on these P-forms was referenced to supplies of inorganic P (Pi) as operational definition of the relative potential bioavailability. The bioavailability of ten organic P molecules ranged 1–70% of Pi while these forms were generally not detected by colorimetric method (CM, malachite green) or ion chromatography (IC). The bioavailability of P associated with Fe- and Al oxides ranged 55–85% of Pi and these forms were completely detected by CM and partially by IC. The bioavailability of total dissolved P in the environmental samples ranged 7–85% (mean 43%) of Pi. The P detected by IC underestimates bioavailable P while CM and total dissolved P (inductively coupled plasma, ICP) overestimate P bioavailability by, on average 44% (CM) or 57% (ICP) in the environmental samples. We conclude that CM is the best index among the three tested for predicting long-term availability of environmental dissolved P in which colloidal P contributes more importantly than organic P. |
| Databáze: | OpenAIRE |
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