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. Author manuscript; available in PMC: 2021 Jun 1.
Published in final edited form as: Anal Bioanal Chem. 2021 Apr 12;413(14):3763–3774. doi: 10.1007/s00216-021-03324-5

Fig. 4.

Fig. 4

Results of glyphosate (a) and AMPA (b) measurements in water of varying hardness levels. Samples which had no EDTA amendment (black bars, [EDTA] = 0 μM) consistently exhibited analyte measurements below the spiked concentration (dashed line) of 20 μg L−1, while accurate measurements were observed relative to the spiked concentration in EDTA-amended samples (white bars, [EDTA] = 10 μM). Error bars represent standard deviation among triplicate measurements of samples. These results demonstrate that water hardness up to ~340 mg L−1 CaCO3 did not impact the accuracy of the developed method when samples were amended with EDTA