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Fig. 6. Solution 31P NMR spectra of aromatic orthophosphate esters used in the measurement of phosphatase activity added to a soil extract (0.25 M NaOH and 0.05 M EDTA) that had been lyophilized and redissolved in D2O and 1 M NaOH. The methylumbelliferyl compounds were dissolved in D2O and 1 M NaOH only.
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