Figure 2
(a) S K-edge spectra of the reference compounds Fe monosulfide, pyrite, elemental S, L-cysteine, methionine sulfoxide, dimethyl sulfone, Na hexane sulfonate and Na sulfate. (b) Fe K-edge spectra of the reference compounds ferrihydrite, goethite, pyrite, Fe monosulfide and biotite used for the LCF analyses. All standards were diluted and finely ground with quartz to a concentration of 2000 mg S and Fe kg−1. |