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Spectrophotometric determination of phosphate in matrices from sequential leaching of sediments
Author(s) -
Anschutz Pierre,
Deborde Jonathan
Publication year - 2016
Publication title -
limnology and oceanography: methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.898
H-Index - 72
ISSN - 1541-5856
DOI - 10.1002/lom3.10085
Subject(s) - authigenic , apatite , biogeochemistry , leaching (pedology) , carbonate , environmental chemistry , phosphorus , phosphate , genetic algorithm , chemistry , mineralogy , phosphate minerals , environmental science , geology , soil science , soil water , organic chemistry , ecology , biology
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.