Simultaneous Determination of Parathion, Malathion, Diazinon, and Pirimiphos Methyl in Dried Medicinal Plants Using Solid-Phase Microextraction Fibre Coated with Single-Walled Carbon Nanotubes

Table 2

Calibration curve parameters of the developed HS-SPME method for determination of OPPs in medicinal plant samples.

Target compound	Linear range (ng g^−1)	Limit of detection (LOD) (ng g^−1)	Calibration curve equation	Coefficient of estimation (𝑟^2)
Diazinon	1.5–300	0.3	𝑦=0.97𝑥+0.214	0.993
Pirimiphos methyl	1.5–300	0.3	𝑦=0.91𝑥−0.014	0.993
Malathion	2.5–300	0.5	𝑦=0.86𝑥+0.087	0.991
Parathion	2.5–300	0.5	𝑦=0.83𝑥−0.127	0.991