Sequential extraction and analysis of phosphorus in marine sediments: Streamlining of the SEDEX procedure

Anderson, L. D., M. L. Delaney

Limnol. Oceanogr., 45(2), 2000, 509-515 | DOI: 10.4319/lo.2000.45.2.0509

ABSTRACT: We streamlined the five-step SEDEX (sedimentary extraction) procedure for characterizing sedimentary phosphorus to a four-step procedure. We combined extraction of adsorbed and oxide-associated pools into a single step, retaining steps for authigenic, detrital, and organic P. In addition, we used automated spectrophotometric flow injection analysis (FIA) to determine P concentrations, rather than traditional spectrophotometric tech-niques. We decreased our total extraction and analytical time from 12 d for 24 replicate samples to 5 d without sacrificing our geo-chemical\ objectives, detection limits, or analytical reproducibility.

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