Skip to main content
. Author manuscript; available in PMC: 2015 Sep 15.
Published in final edited form as: Geochim Cosmochim Acta. 2014 Sep 15;141:240–257. doi: 10.1016/j.gca.2014.05.030

Figure 6.

Figure 6

Comparison of apparent pyrite concentration from linear combination fits to S XANES and Fe XANES. Moles of pyrite per kg of tailings were calculated from the pyrite fractional fit from Fe and S XANES spectra and the moles of Fe and S in the tailings respectively. The solid line is the linear correlation (r2= 0.944), the dashed line is the Fe:2S line, accounting for stoichiometry of FeS2. Error bars are from the calculated error estimates from the S and Fe fits and not from replicate spectra. The pH is shown in circles for each associated sample.