Table 3. Validation Parameters for the Optimized Derivatization Method.

	precision (RSD, %) n = 3
	repeatability		interday		limits (0.01–1 μg/L)		calibration (0.01–1 μg/L)	calibration (1–100 μg/L)
compounds	low	high	low	high	LOD	LOQ	R2
glyphosate	3.50	2.10	3.70	0.60	0.04	0.12	0.989	0.997
glufosinate	1.20	0.70	1.10	0.10	0.03	0.09	0.994	0.997
AMPA	4.40	3.70	2.30	1.10	0.05	0.16	0.981	0.995