Table 3.

RSD values for the precision of ICP-MS during the determination of Ca, Cd, and Pb in the lowest standard solution (10 mM, 10 μM, and 10 μM, respectively (n = 3 samples)).

Ca
Day	Measured concentration (mM)	RSD value (%)
		Repeatability	Intermediate precision
First	10.3 ± 0.04	0.4
Fourth	9.35 ± 0.02	0.2	1.3
Sixth	10.6 ± 0.01	0.090
Cd
Day	Measured concentration (μM)	RSD value (%)
		Repeatability	Intermediate precision
First	9.40 ± 0.05	0.5
Fourth	9.89 ± 0.08	0.8	1.0
Sixth	9.93 ± 0.03	0.3
Pb
Day	Measured concentration (μM)	RSD value (%)
		Repeatability	Intermediate precision
First	10.1 ± 0.01	0.1
Fourth	9.94 ± 0.04	0.4	0.4
Sixth	10.2 ± 0.01	0.1