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Caption : chromatogram of the tolfenpirad standard at a concentration of 5 mg l-1 in scan mode (a), mass spectrum of tolfenpirad obtained from gc-ms (b).

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Caption : chromatograms of the spiked matrix extract with tolfenpyrad at a concentration of 90 µg kg-1 obtained in sim mode with different temperature settings: (a) 100 °c at 35 °c min-1 up to 300 °c and held for 6 min, (b) 100 °c at 30 °c min-1 up to 300 °c and held for 6 min and (c) 100 °c at 25 °c min-1 up to 300 °c and held for 6 min.

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Caption : statistical tests to assess linearity. (a) jacknife plot to identify extreme values; (b) analytical curve of the matrix extract and the solvent fortified with tolfenpyrad. r2: coefficient of determination; (c) ryan-joiner plot to determine the normality of the residuals, r: correlation coefficient, rcrit: critical correlation coefficient; (d) durbin-watson plot to assess the independence of the residuals. 

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Caption : chromatograms of real samples contaminated with tolfenpyrad at concentrations of: (a) 11 µg kg-1, (b) 45 µg kg-1 and (c) 12 µg kg-1.