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Development of an iron oxide-impregnated paper strip technique for the determination of bioavailable phosphorus in runoff.

Dils, R. M. and Heathwaite, A. Louise (1998) Development of an iron oxide-impregnated paper strip technique for the determination of bioavailable phosphorus in runoff. Water Research, 32 (5). pp. 1429-1436.

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Abstract

Bioavailable phosphorus (P) requires separate analysis because it is independent of physical and chemical P fractions present in runoff. Iron oxide-impregnated paper strips (Pi-strips) provide a simple technique for determining bioavailable P in aqueous samples. In this study, some controversial strip preparation procedures were examined and subsequently modified, and the efficiency of the technique was compared to the conventional physico-chemical fractionation approach. Pi-strips prepared using Whatman 50 filter paper rapidly drawn through iron chloride solution then immersed in ammonium hydroxide solution produced the most accurate and precise results. A strong asymptotic relationship between P uptake and the duration of shaking, coupled with rapid intra-sample transformations between P fractions, indicated that shaking for 8 h was sufficient for complete P uptake from natural water samples and standard solutions (0–250 μg P l−1). A single Pi-strip was used because multiple strips increased analytical error. The contribution to Pi-strips from adhering sediment particles was negligible for samples with low concentrations of solids but turbid samples (>0.75 mg l−1 suspended solids) were noticeably influenced by P derived from particulate material. Fractionation of agricultural runoff demonstrated a strong relationship between the dissolved inorganic (MRP and Pi-strip fraction, but only 85% of the total dissolved fraction (TDP) was retained by the Pi-strip, suggesting not all soluble P was available for biological uptake.

Item Type: Article
Journal or Publication Title: Water Research
Additional Information: Development of an iron oxide-impregnated paper strip technique for the determination of bioavailable phosphorus in runoff. 17 cites: http://scholar.google.com/scholar?num=100&hl=en&lr=&cites=6571433676827855440
Uncontrolled Keywords: bioavailable phosphorus ; agricultural runoff ; iron oxide paper strips
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 49770
Deposited By: ep_importer_pure
Deposited On: 19 Sep 2011 09:46
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 19:32
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/49770

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