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Fig. 4. Phosphorus-31 nuclear magnetic resonance (NMR) spectra of the sheep dung extract using a delay of 0.1 and 15 s. The term S/N is the signal to noise ratio. Assignments are given for each class of P compound above their respective peak. Numbers refer to concentrations given in Table 4. The miniature spectra show the full intensity of orthophosphate relative to other peaks.
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