Journal
HYDROBIOLOGIA
Volume 709, Issue 1, Pages 41-53Publisher
SPRINGER
DOI: 10.1007/s10750-013-1442-8
Keywords
Phosphorus; Algae; Bioassay; Long-term bioavailability; Ion chromatography; Colorimetry
Categories
Funding
- KUL [OT/08/020]
- IWT [81218]
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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 (P-i) as operational definition of the relative potential bioavailability. The bioavailability of ten organic P molecules ranged 1-70% of P-i 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 P-i 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 P-i. 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.
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