Fig. 2. Examples of S K-XANES spectra of three humic acid samples compared with the reproduced data using three significant abstract components extracted by PCA. The energy scale is relative to S(0) K-edge at 2472 eV.
Fig. 2. Examples of S K-XANES spectra of three humic acid samples compared with the reproduced data using three significant abstract components extracted by PCA. The energy scale is relative to S(0) K-edge at 2472 eV.