Authors:Feng Tang, Shimei Ge, Yongde Yue, Rimao Hua, and Rong Zhang
A high-performance thin-layer chromatographic method has been developed for determination of four carbamate residues in vegetables. The method uses two mobile phases on silica gel 60 F
GLP HPTLC layers, and detection at
= 243 nm and 207 nm, the average wavelengths of maximum adsorption of pirimicarb and methomyl, and carbaryl and carbofuran, respectively. Recovery of 1.0–5.0 mg kg
of the four mixed carbamates from wax gourd and potatoes was 70.05–103.7%. The accuracy and precision of the method were confirmed by means of fortification experiments.
Authors:Shimei Ge, Feng Tang, Yongde Yue, Rimao Hua, and Rong Zhang
Residues of three pyrethroids in spiked vegetables have been analyzed by HPTLC with two mobile phases in a twin-trough chamber and in horizontal chambers. The spots were detected at
= 203 nm and the greatest detection sensitivity for the three pyrethroids was 10 ng. Recovery after fortification at 0.5–5.0 mg kg
was from 70.20 to 108.5%. The relative standard deviation was 1.59–27.94%.
Authors:Rong Zhang, Yongde Yue, Rimao Hua, Feng Tang, Haiqun Cao, and Shimei Ge
In this work we have studied the separation of a mixture of the sulfonylurea herbicides (metsulfuron-methyl, chlorsulfuron, bensulfuron-methyl, tribenuron, chlorimuron-ethyl) by HPTLC on silica gel F
plates, with two different mobile phases. We also studied the effect of humidity on the separation. Bensulfuron-methyl added to tapwater at levels of 5, 10, and 20 µg kg
were determined after extraction by LC
SPE. Detection limits of the method are given.