A. Corcia, C. Crescenzi, R. Samperi
Jul 15, 1997
Citations
1
Influential Citations
63
Citations
Journal
Analytical Chemistry
Abstract
Seven commonly used sulfonylureas (SUs), i.e., thifensulfuron methyl, metsulfuron methyl, triasulfuron, chlorsulfuron, rimsulfuron, tribenuron methyl, and bensulfuron methyl, were extracted from water by off-line solid-phase extraction with a Carbograph 4 cartridge. SUs were then isolated from both humic acids and neutral contaminants by differential elution. Analyte fractionation and quantification were performed by liquid chromatography (LC) with UV detection. Recoveries of SUs extracted from 4 L of drinking water (10 ng/L spike level), 2 L of groundwater (50 ng/L spike level), and 0.2 L of river water sample (250 ng/L spike level) were not lower than 94%. Depending on the particular SU, method detection limits were 0.6−2 ng/L in drinking water, 2−9 ng/L in groundwater, and 13−40 ng/L in river water. A preservation study of SUs stored on the Carbograph 4 cartridge was conducted. Over 2 weeks of cartridge storage, no significant analyte loss was observed when the cartridge was kept frozen as a precaution...