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Phosphorus in Runoff Assessed by Anion Exchange Resin Extraction and an Algal Assay

Risto Uusitalo* and Petri Ekholm

Finnish Environment Institute, P.O. Box 140, FIN-00251 Helsinki, Finland



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  		Fig. 1. Relationship between anion exchange resin–extractable P (AER-P) and P uptake by Selenastrum capricornutum in a 3-wk dual culture algal assay (DCAA-P) for field runoff samples from three clayey Cryaquepts (n = 14). The error bars indicate SE of the mean concentrations.

 


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  		Fig. 2. Coefficient of variation (CV, %) for the AER test (n = 151) and the DCAA (n = 145), calculated from the results of replicated sample analysis. The AER results are all from analyses of field runoff, whereas the DCAA data include wastewater analyses.

 


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  		Fig. 3. Phosphorus yields (µg P; error bars indicate SD; n = 6) and recovery percentage of added P (relative to P yield without competing anions) in AER extraction when the amount of competing anions (Cl-, NO-3, or SO2-4) in the studied sample (40 mL) increases. All solutions contained 12 µg added P (0.3 mg P L-1 in a 40-mL sample).

 




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