The ME was calculated as the average percent enhancement or suppression in the slopes using the equation: % ME = S l o p e o f m a t r i x − m a t c h e d c a l i b r a t i o n c u r v e S l o p e o f s t a n d a r d i n s o l v e n t × 100 % The % ME ranged from 68 to 155%, although four analytes exhibited matrix enhancements (≥ 100%)—delta BHC, endrin, endosulfan sulfate, and p, p’- DDT; this indicates that at higher concentrations (≥ 25 μg L -1 ), the matrix effect is not quite significant.
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A comparison of the effectiveness of QuEChERS, FaPEx and a modified QuEChERS method on the determination of organochlorine pesticides in ginseng.
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