Authors: Battaglin, WA Furlong, ET Burkhardt, MR Peter, CJ

Citation: Wa. Battaglin et al., Occurrence of sulfonylurea, sulfonamide, imidazolinone, and other herbicides in rivers, reservoirs and ground water in the Midwestern United States, 1998, SCI TOTAL E, 248(2-3), 2000, pp. 123-133

Authors: Furlong, ET Burkhardt, MR Gates, PM Werner, SL Battaglin, WA

Citation: Et. Furlong et al., Routine determination of sulfonylurea, imidazolinone, and sulfonamide herbicides at nanogram-per-liter concentrations by solid-phase extraction and liquid chromatography/mass spectrometry, SCI TOTAL E, 248(2-3), 2000, pp. 135-146

Authors: Burkhardt, MR Soliven, PP Werner, SL Vaught, DG

Citation: Mr. Burkhardt et al., Determination of submicrogram-per-liter concentrations of caffeine in surface water and groundwater samples by solid-phase extraction and liquid chromatography, J AOAC INT, 82(1), 1999, pp. 161-166

Authors: Burkhardt, MR Brenton, RW Kammer, JA Jha, VK O'Mara-Lopez, PG Woodworth, MT

Citation: Mr. Burkhardt et al., Improved method for the determination of nonpurgeable suspended organic carbon in natural water by silver filter filtration, wet chemical oxidation, and infrared spectrometry, WATER RES R, 35(1), 1999, pp. 329-334