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Figure 7
X-ray fluorescence spectra of refractory organic substances from the environment, namely three fulvic acids and one humic acid. The difference in peak height between the fulvic and the humic acids can clearly be seen.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 17| Part 2| March 2010| Pages 149-157
https://doi.org/10.1107/S0909049509049905
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