Fig. 6
From: Characterizing the phosphorus forms extracted from soil by the Mehlich III soil test
Mass spectrometry spectrum of typical sample extracted with NaOH-EDTA followed by Chelex cation removal. Most of the peaks listed in Table 7 are evident here. The 328.92 peak is the most abundant (100%), followed by 578.89 and 658.85 all of which are inositol hexaphosphates. The peaks at 96.96 and 78.85 are phosphates, which have been liberated under the 15 eV CID added in the electrospray chamber