The Potential of Graphene as an Adsorbent for Five Pesticides from Different Classes in Rape Oil Samples Using Dispersive Solid-Phase Extraction

Table 3

Effect of the desorbing solvent volume on extraction efficacy of the five pesticides from rape oil samples.

Pesticide	Extraction recovery (%),
	3 mL of acetonitrile	4 mL of acetonitrile	5 mL of acetonitrile	6 mL of acetonitrile	7 mL of acetonitrile
Metazachlor	18 ± 4	54 ± 6	68 ± 6	29 ± 8	15 ± 3
Tebuconazole	38 ± 5	70 ± 5	76 ± 5	48 ± 6	29 ± 5
λ-Cyhalothrin	34 ± 6	54 ± 7	65 ± 5	32 ± 9	16 ± 5
Chlorpyrifos	22 ± 6	61 ± 10	69 ± 8	51 ± 5	25 ± 7
Deltamethrin	16 ± 4	60 ± 5	67 ± 6	21 ± 8	12 ± 5
OC^1	25.9 ± 9.8^2	59.8 ± 6.7	69.2 ± 4.2	36.2 ± 12.9^2	19.7 ± 7.1

¹Value of the optimization criterion; ²statistically significant from the highest result.