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Response factors of glyphosate (black) and AMPA (white) standards in NanoPure water, hard water (94 mg L−1 CaCO3), and EDTA-amended hard water. Error bars represent standard deviation among triplicate measurements. The percentages represent magnitude of observed matrix effects in hard water and EDTA-amended hard water ([EDTA] = 10 μM) with respect to NanoPure water. The data suggest that EDTA-amended samples will increase the response factor of both analytes from hard water
