The hydrolysis rate of isopropyl methylphosphonofluoridate (GB) in seawater can be predicted from known or extrapolated rate constants for the reaction between GB and the hydroxo-metal complexes of magnesium and calcium and between GB and the hydroxide ion. At 25 degrees C and pH 7.9 (typical values of many surface waters) the half-life of GB is approximately 30 minutes.
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Joseph Epstein (1970) studied this question.