SSSAJ Journal of Natural Resources and Life Sciences Education
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Fig. 3 Fully and almost fully relaxed direct-polarization magic-angle spinning (DPMAS) spectra of five humic acids (HAs) and International Humic Substances Society (IHSS) Florida peat as indicated on the right. The recycle delays are given on the left. Note the large intensity of the sp2 carbons (which still tend to be underrepresented due to their longer relaxation times)





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