Table 2.

Kinetic parameters for the chlorpyrifos dissipation in date fruits in presence of different wash treatments

Wash treatmenta	Kinetic parameters
	A0 (μg/kg)	B0 (μg/kg)	α (min-1)	β (min-1)	t1/2α (min)	t1/2β (min)	Regression coefficient (R2)
T2	21.90	16.05	0.013	0.005	53.33	138.65	0.988
T3	7.60	4.60	0.050	0.023	13.86	30.14	0.999
T4	5.25	0.35	0.055	0.040	12.60	17.33	0.999
T5	10.60	3.80	0.033	0.021	21.01	33.01	0.997
T6	8.25	3.65	0.036	0.015	19.25	46.22	0.999
T7	21.05	9.05	0.055	0.046	12.60	15.07	0.999
T8	16.40	7.10	0.057	0.033	12.16	21.01	0.999
T9	13.10	8.85	0.024	0.012	28.88	57.77	0.999
T10	11.70	5.50	0.025	0.013	27.73	53.33	0.994

^asee Table 1

A₀ and B₀ are the concentrations of chlorpyrifos at zero time, while α and β are the disappearance rate constants for the first and second and phases

t_1/2α and t_1/2β are the half-life times for the first and second and phases

Each value is the mean of three replicates with 6 determinations