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Chemical and Biological Technologies in Agriculture
Figure 3 | Chemical and Biological Technologies in Agriculture

Figure 3

From: Characterization of terrestrial dissolved organic matter fractionated by pH and polarity and their biological effects on plant growth

Figure 3

The proton NMR spectra for all samples, showing the samples fractionated according to a) pH solubility and b) polarity using C18 resin (the hydrophilic filtrate and hydrophobic retentate were mixed in ratios of filtrate: retentate of 100:0, 75:25, 50:50, 25:75, and 0:100). The sample names given in color correspond to the spectral line coloring. Bulk functionalities by chemical shift are given, and the spectra are scaled to the TMS (tetramethylsilane) peak. Asterisks (*) indicate the peaks due to acetate/acetic acid, methanol, and formate/formic acid. Peak area integrations for each sample are given in Table 2.

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