Identification of an organic compound leached from a membrane filter.
An organic compound leached from a Millipore HA filter has been identified as the non-ionic surfactant polyoxyethylene nonylphenyl ether with a degree of polymerization of 4-10 for the ethylene oxide unit. It is suggested that the Millipore HA filter should be used only after several rinses with sample or doubly-distilled water.
Otsuki
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Division of Chemistry and Physics, National Institute for Environmental Studies, P.O. Yatabe, Tsukuba, Ibaraki 300-21, Japan.
Fuwa
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