Spectrophotometric determination of phosphate in matrices from sequential leaching of sediments. (18th January 2016)

• Record Type: Journal Article
• Authors: Anschutz, Pierre; Deborde, Jonathan
• Is Part Of: Limnology and oceanography, methods. Volume 14:Number 4(2016:Apr.)
• Page Start: 245
• Page End: 256
• Publication Date: 2016-01-18
• Subjects: Limnology -- Methodology -- Periodicals; Oceanography -- Methodology -- Periodicals; 551.48
• DOI: 10.1002/lom3.10085
• Languages: English
• ISSNs: 1541-5856

Abstract

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.