Pesticide Residue - Figures
Figure 1: Electron capture detector gas chromatogram of an extract of a marine sediment containing 29 µg/kg total DDT + metabolites and 2 µg/kg dieldrin. I.S = internal standard.
Figure 2: Nitrogen-phosphorus detector gas chromatogram of an extract of a ground water sample containing simazine (0.10 µg/litre) and terbutylazine (0.51 µg/litre).
Figure 3: Derivatisation of residues of sulfonyl urea herbicides with diazomethane in ethyl acetate to form thermostable dimethyl derivatives.
Figure 4: Reconstructed ion chromatograms of the confirmatory analysis by GC-SIM-MS of a water sample spiked with cinosulfuron (CS), chlorimuron-ethyl (CM), primisulfuron-methyl (PS), thifensulfuron-methyl (TF), triasulfuron (TS) and tribenuron-methyl (TB) 0.1 µg/1 each.
Figure 5a Mixed pesticide standard (1 ng each) by HRGC using column effluent splitting to ECD and NPD: 1, simazine; 2, lindane; 3, pirimicarb,; 4, bromacil; 5, aldrin; 6, triadimefon; 7, parathion ethyl; 8, penconazole; 9, endosulfan-a; 10, dieldrin; 11, endosulfan-b; 12, carbophenothion; 13, p,p-DDT; 14, dicofol; 15, permethrin; 16, cyfluthrin; 17, cypermethrin; 18, fenvalerate; 19, fluvalinate; and 20, deltamethrin.
Figure 5b HRGC analysis of extract of tomatoes with incurred residues: 1, pirimiphosmethyl 0.17 mg/kg; 2, carbophenothion internal standard 0.4 mg/kg; and 3, permethrin 0.03 mg/kg.
Figure 6: Predicted versus found residues for chlorpyrifos on kiwifruit following 6 sprays.
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