Abstract: Sample (500 µL) containing 0.52-2.62 µM-carbendazim was injected into a carrier stream of water (4.4 ml/min) and merged with a buffer stream (4.2 ml/min) followed by a stream of a micellar solution (11.2 ml/min). The fluorescence of resulting stream was measured in a quartz flow cell. Two systems were studied; the first was based on the use of 0.5% SDS micelles in 0.1 M HCl with detection at 368 nm (excitation at 283 nm) and the second was based on the use of 0.1% hexadecyltrimethylammonium bromide in 0.1 M NaOH with detection at 327 nm (excitation at 306 nm). Linear calibration graphs were obtained over the range given above. The detection limits for carbendazim were 0.11 µM (system 1) and 0.013 µM (system 2) and the RSD (n = 5) for 2 µM-carbendazim were 2.25% (system 1) and 0.5% (system 2). Recoveries of 0.6-2.76 µM-carbendazim from spiked natural waters were >94%. The recoveries of 1 µM-carbendazim from polluted waters containing 0.8 µM-carbendazim were 102.9% (system 1) and 99.3% (system 2). The sample throughput was 160 injections/h.

Abstract: In Raman spectroscopy, detection limits for organic pollutants in water can be lowered by several orders of magnitude when surface enhanced techniques are applied. In this work a continuous analytical device based on flow injection analysis using SERS detection is proposed. This system was tested with model analytes such as pyridine and nicotinic acid as well as several pesticides (carbendazim, metazachlorine). (C) 1997 Elsevier Science B.V. 22 References