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Standard Operating Procedures

Sequential Iron Extraction

Introduction

The sequential iron extraction method was created by Eva Stueeken on 160620 following protocols in the UCR Lyons Lab. Their are three steps, performed sequentially on the same powder aliquot:

  1. Sodium acetate (Fe in carbonate)
  2. Sodium dithionate (Fe oxides, except magnetite)
  3. Ammonium oxalate (magnetite)

Pyrite-bound iron is extracted separately with chrome-reduction and an independent powder aliquot. 

 

Adjust reagent quantities for smaller batches of samples

 

Step 1: sodium acetate 

Preparing the reagent:

Extraction procedure:

 Step 2: sodium dithionate

Preparing the reagent:

Extraction procedure:

Step 3: ammonium oxalate

Preparing the reagent:

Extraction procedure: