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Extent of matrix effects of (a) glyphosate and (b) AMPA in undiluted and fivefold, 10-fold, and 20-fold diluted QuPPe extracts of lemon, soybean, Swiss chard, rhubarb, and cucumber. (c) The relative responses of the peak area of glyphosate and AMPA in lemon extracts undiluted and following fivefold, 10-fold, and 20-fold dilution with ultrapure water (n=3). No result for ME of AMPA in 20-fold dilution of soybean and Swiss chard is shown due to too poor signals
