TABLE 1.

Intraday and interday coefficients of variation of the proposed method in spiked ultrapure water samples

Spiked ultrapure water concentration (mg/L)	Intraday (n = 5)a			Interday (n = 15)b
	Mean ± SD (mg/L)	RSD (%)	Accuracy (%)	Mean ± SD (mg/L)	RSD (%)	Accuracy (%)
0.1	0.1031 ± 0.0039	3.8	103.1	0.1018 ± 0.0031	3.0	101.8
0.25	0.2547 ± 0.0048	1.9	101.9	0.2436 ± 0.0116	4.8	97.4
2.5	2.4827 ± 0.0454	1.8	99.3	2.4836 ± 0.0667	2.7	99.3

Abbreviation: RSD, relative standard deviation.

^a Intraday reproducibility analysis was performed on a single day.

^b Interday reproducibility analysis was performed over consecutive days in five replicates.