Sensitive Spectrophotometric Determinations of Paracetamol and Protriptyline HCl Using 3-Chloro-7-hydroxy-4-methyl-2H-chromen-2-one

Table 2

Evaluation of accuracy and precision.

Amount taken; (µg mL^−1)	Amount found*; (µg mL^−1)	RE; (%)	SD; (µg mL^−1)	RSD; (%)
PCT
10.00	9.88	1.20	0.15	1.50
20.00	19.54	2.30	0.26	1.33
30.00	29.91	0.46	0.27	0.46
PTP
40.00	39.37	1.57	0.74	1.87
60.00	59.60	0.66	0.61	1.02
80.00	79.83	0.21	1.30	1.74

∗Mean value of five determinations.
RE: relative error; SD: standard deviation; RSD: relative standard deviation.