Gas chromatographic determination of metalaxyl in lettuce
article
Two methods are described. In method I lettuce extracts are directly injected into a gas chromatograph containing a SIL 5 and a BP 10 column and two nitrogen-selective detectors. A twin-hole ferrule holds the inlets of both columns. In this construction one injection is split between the two columns, saving time and autoinjector equipment. Method II is based on the same chromatographic system but includes a cleanup step with SEP-PAK silica cartridges. Methods I and II yield recoveries of 88-108% and 74-98%, respectively, in the 0.05-0.5 mg/kg range. The detection limit of metalaxyl with methods I and II is 0.04 and 0.01 mg/kg, respectively. Comparison of both methods applied to field-treated samples yields a correlation coefficient of 0.9996 for 23 observations. Method I takes less time but is slightly less specific than method II. © 1989 American Chemical Society.
Topics
TNO Identifier
230966
ISSN
00218561
Source
Journal of Agricultural and Food Chemistry, 37(1), pp. 88-90.
Pages
88-90
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