| 12800919 |
Liu JF, Chao JB, Jiang GB, Cai YQ, Liu JM: Trace analysis of sulfonylurea herbicides in water by on-line continuous flow liquid membrane extraction--C18 precolumn liquid chromatography with ultraviolet absorbance detection. 6: id: 16433380 Error occurred: Error 11 (Resource temporarily unavailable) 7: id: 16163195 Error occurred: Error 11 (Resource temporarily unavailable)J Chromatogr A. 2003 May 2;995(1-2):21-8.
An on-line system that consists of continuous-flow liquid membrane extraction (CFLME), C18 precolumn, and liquid chromatography with UV detection was applied to trace analysis of sulfonylurea herbicides in water. During preconcentration by CFLME, five target compounds, including metsulfuron methyl, bensulfuron methyl, tribenuron methyl, sulfometuron methyl, and ethametsulfuron, were enriched in 960 microl of 0.5 mol l (-1) Na2CO3-NaHCO3 (pH 10.8) buffer used as acceptor. This acceptor was on-line neutralized and transported to the C18 precolumn where the analytes were absorbed and focused. Then the focused analytes were injected onto a C18 analytical column for separation and detection at 240 nm. The proposed method was applied to determine sulfonylurea herbicides in water, river, and reservoir water with detection limits of 10-50 ng l (-1) when enriching a 120-ml sample. Throughput is typically one sample per hour. |
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