Regression equations, LOD and LOQ of six analytes.

Analyte	Calibration curve	R 2	Range (μg L−1)	LOD (μg L−1)	LOQ (μg L−1)
Diazepam	Y = 6356.35X + 2.25	0.9991	0.01–10.0	0.002	0.005
Chlorpromazine	Y = 6471.17X − 25.67	0.9992	0.01–10.0	0.001	0.005
Clozapine	Y = 7830.00X + 5.51	0.9990	0.01–10.0	0.001	0.005
Triazolam	Y = 5828.78X + 31.11	0.9992	0.01–10.0	0.002	0.005
Alprazolam	Y = 3632.50X + 2.93	0.9991	0.01–10.0	0.005	0.01
Estazolam	Y = 4027.09X + 5.25	0.9999	0.01–10.0	0.005	0.01