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Figure 12: Quantification of identified polycyclic aromatic hydrocarbon's in Portulaca oleracea . Formula = (C × V/m) C = value of “x” which reflects the concentration, to be calculated from calibration curve straight line equation. V = final volume including dilution factor (if any) (2 mL). m = weight of the main extract in g (value of “m” for control and sample are 0.056 g and 0.067 respectively) 
