Fig. 1From: Simultaneous determination of sulfonylurea herbicides in tomatoes using the QuEChERS method coupled with HPLCHPLC chromatograms of sulfonylurea herbicides in tomato extracts after QuEChERS extraction without spiking (A) and with spiking (B). Each spiked concentration of sulfonylurea herbicides was 5 µg mL−1. 1, nicosulfuron; 2, thifensulfuron-methyl; 3, flucetosulfuron; 4, imazosulfuron; 5, propyrisulfuron; 6, metazosulfuron; 7, halosulfuron-methylBack to article page