Table 3.

Comparison of the method with other studies.

Method	Analyte	Linear range	Concentration (μg/mL)	Recovery (%)	LOD	Reference
LLE–GC/MS	MA, PD, TD, etc.	10–5000 ng/mL	2.5	63.3–81.1	2 ng/mL	[18]
SPE–GC/MS	MA, PD, TD, etc.	10–5000 ng/mL	2.5	66.8–98.5	2 ng/mL	[18]
SPE–GC/MS	MA, KT, etc.	5–200 ng/mL	0.1	95.4–96.8	2.5 ng/mL	[19]
SPE–GC/MS	MA, KT, TD, etc.	0.2–50 μg/mL	10	30–82	0.06–2 μg/mL	[20]
LLE–GC/MS	MA, PD, TD, KT	–	0.5	63–104	25–50 ng/mL	[21]
SPE–GC/MS	PD	1.25–40 ng/mL	0.02	109 ± 10.9	0.5 ng/mL	[22]
DLLME–GC/MS	MA, PD, TD, KT	10–1000 ng/mL	0.1	80.45–95.55	0.43–1.96 ng/mL	Present work