Spectrophotometric determination of phosphate in matrices from sequential leaching of sediments

Type Article
Date 2016-04
Language English
Author(s) Anschutz Pierre1, Deborde JonathanORCID1
Affiliation(s) 1 : Univ Bordeaux, CNRS, UMR EPOC 5805, Talence, France.
Source Limnology And Oceanography-methods (1541-5856) (Wiley-blackwell), 2016-04 , Vol. 14 , N. 4 , P. 245-256
DOI 10.1002/lom3.10085
WOS© Times Cited 23
Abstract

The speciation of Phosphorus (P) in geologic materials can inform diverse investigations in such as aquatic biogeochemistry, soil sciences, and paleo-oceanography. Here, we describe in detail a set of sequential extraction schemes to measure P concentrations from several operationally defined phases: pore water, exchangeable or loosely sorbed P, Fe-bound P, P associated with biogenic apatite, P associated with authigenic apatite and carbonate forms, P associated with detrital apatite and inorganic forms, and organic P. The two benefits of the procedures we describe compared to prior methodological studies are: (1) fast, simple and inexpensive colorimetric methods have been developed for P determination in all the different matrices; and (2) the Fe-bound phosphorus pool is separated into two fractions, allowing the P associated with most reactive Fe-fraction to be distinguished from P bound to the remainder of the Fe-oxides. Adaptations of these procedures to optimize the characterization of P pools in a range of material types are also outlined.

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