Supercritical fluid extraction (SFE) of alkyl alkylphosphonofluoridates and dialkyl alkylphosphonates from painted plates was investigated. It was found that SFE recoveries compared favorably with conventional solvent sonication results. Stability studies of the samples were carried out over a period of two months. This investigation showed that the concentration of phosphonofluoridates decreased over a long period.
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