Abstract
A method for the trace analysis of naptalam, N-1-naphthylphthalamic acid, in water is presented. Naptalam, a pre-emergent, broad-leaf, and grassy herbicide, is used with soybean, peanut, and vine crops. Tap and well water samples are extracted on a cyclohexyl solid phase extraction cartridge, eluted from the cartridge with methanol, and evaporated to dryness. The sample is esterified with diazoethane, evaporated to dryness, reconstituted with methanol, and converted to the stable N-1-naphthyl phthalimide in the gas chromatograph (GC) injector port for detection and quantitation using a nitrogen-phosphorus detector. Sample injection technique and injector port temperature are critical to high derivatization yields. Confirmation of conversion to N-1-naphthyl phthalimide was made by gas chromatograph/mass spectrometer (GC/MS). Spiking tests at levels of 3 to 100 μg/L showed good recovery.
Similar content being viewed by others
References
Fieser LF and Fieser M (1967) Reagents for Organic Synthesis. John Wiley and Sons, Inc., New York, NY
Herbicide Handbook of the Weed Science Society of America, Fifth Edition (1983) Weed Science Society of America, Champaign, IL
Johnson RH (1965) N-1-naphthylphthalamic acid residues on food crops. J Assoc Offic Anal Chem 48:776–778
Lane JR, Gullstrom DK, Newell JE (1958) Extension of the residue methods for 1,2-Dihydro-3,6-pyridazinedione (maleic hydrazide) and N-1-naphthylphthalamic acid (Alanap). Agric Food Chem 6:671–674
Richard JJ, Fritz JS (1980) The concentration, isolation, and determination of acidic material from aqueous solution. J Chromatogr Sci 18:35–38
Smith ES, Stone GM (1953) Microdetermination of N-1-naphthylphthalamic acid residues in plant tissues. Anal Chem 5:1397–1399
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wolfe, M.F., Seiber, J.N. A method for the trace analysis of naptalam (N-1-naphthylphthalamic acid) in water. Arch. Environ. Contam. Toxicol. 23, 137–141 (1992). https://doi.org/10.1007/BF00226006
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00226006