||Accuracy of Pesticide Reference Standard Solutions. Part II. Chemical Stability Under Four Storage Conditions.
Hodgson, David W. ;
Thompson, John F. ;
Watts, Randall R. ;
||Health Effects Research Lab., Research Triangle Park, NC.
Chemical stabilization ;
Chemical analysis ;
Laboratory equipment ;
Standard reference materials
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||A study was undertaken to assess the long-term chemical stability of dilute standard pesticide solutions of 4 compound classes. The solutions were studied under 4 storage conditions: freezer at -15C; refrigerator at 3C; ambient temperature in the dark; and ambient temperature on the bench top exposed to fluorescent and natural light. Pesticide compounds including 27 organochlorines, 20 organophosphates, 10 triazines, and 13 carbamates were monitored for periods of 6 months to 2 years. Most of the compounds were stable under all conditions for the full length of the study. Solutions of CDEC, butylate, and disulfoton, however, decomposed when stored under all storage conditions. Solutions of carbaryl, methiocarb, and carbofuran decomposed when stored at ambient laboratory temperature with exposure to light. Recommendations are made for formulating solvents, storage, and practical shelf life of high concentration storage, and practical shelf life of high concentration stock solutions and dilue gas chromatographic working standards representing 4 presticide classes.
||Pub. in Jnl. of the Official Analytical Chemists, v65 n1 p94-102 1982.
|NTIS Title Notes
||Reprint: Accuracy of Pesticide Reference Standard Solutions. Part II. Chemical Stability Under Four Storage Conditions.
|PUB Date Free Form
||4 Aug 81
||PC A02/MF A01