Table X.

Values of Atrazine I₅₀ for IL and S268C PSII

	I50 (Affinity) (M)	LoDa (Sensitivity) (M)	SE (M)
IL	4.02 × 10−7	1.00 × 10−8	2.44 × 10−8
S268C	3.76 × 10−8	1.00 × 10−9	1.77 × 10−9

^aThe LOD was determined on the basis of 99% confidence intervals, which, assuming a normal distribution, corresponds to 2.6 × standard error of the measurement (σ). Using then the modified relationship for the Langmuir absorption isotherm, LOD can be calculated as LOD = 2.6 × σ × I₅₀/(100 − 2.6 × σ) as reported by Koblizek et al.²⁹