Table 1.

Regression and statistical parameters obtained from differential pulse voltammetry calibration curves of naproxen and its degradation product using SWCNTs/CPE.

Parameters	NAP		Degradation product
	At 0.85 V	At 1.18 V
Concentration range (µg·mL−1)	0.067–0.67	0.067–1.00	0.067–0.73
Slope of regression line (μA)	0.9083	1.2264	0.7696
s a (μA)	0.0154	0.0321	0.0096
Intercept of regression line (b) (μA·mL·μg−1)	0.0021	−0.0779	0.0141
s b (μA·mL·μg−1)	0.00626	0.0194	0.0043
Correlation coefficient (r)	0.9988	0.9956	0.9993
LOD (µg·mL−1)	0.1042	0.0812	0.045
LOQ (µg·mL−1)	0.31572	0.2461	0.135
SD	0.023	0.025	0.015
RSD (%)	3.04	2.78	3.46