TM96-07 Qualification of Data for Five Compounds on Laboratory Schedules 2050 and 2051

The National Water Quality Laboratory (NWQL) has been reporting data for Schedules 2050 and 2051 since spring 1993. Five compounds on these schedules have been identified as "for qualitative use only" because they were poorly recovered by the analytical method. The quantitations for these compounds are considered to be unreliable, and the data should be used only for qualitative identification purposes. Data for the following compounds must be qualified: 1-Naphthol, Chlorthalonil, Dichlobenil, DNOC, and Esfenvalerate.