Sampling, Sample Preparation and Preservation.- Extraction and Cleanup.- Capillary GC with Selective Detectors (ECD, NPD, FPD).- GC Analysis Based on Mass Spectrometry.- Identification and Confirmatory Analysis Based on Capillary GC - Mass Spectrometry.- Biochemical Methods.- Growth Inhibition of Plants as a Bioassay for Herbicide Analysis.- Assurance of Data Quality.