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Fig. 3. Details showing the peaks for phytic acid in diet, feces, and manure samples, using samples collected from Farm C as an example. A spectrum for pure phytic acid, also extracted with NaOH-EDTA in the same manner as the farm samples, is shown on the bottom, with the P1, P2, P3, P4, and P6 peaks labeled. The areas under the same four peaks in the farm samples were determined both by manual plotting after integration and by spectral deconvolution. For the diet, feces, and manure samples, the solid line indicates the original spectrum, while the dotted lines show the phytic acid peaks as determined by spectral deconvolution. Other peaks determined by spectral deconvolution are not shown. Spectra are plotted with 1-Hz line-broadening.
