Table 2.

Results of the measurements (n = 10) of certified reference materials: SLRS-5 and TM 27.3 given with certified values

Analyte	River water SLRS-5			Fortified lake water TM 27.3
	Measured value (μg L−1)	Certified value (μg L−1)	Accuracy (%)	Measured value (μg L−1)	Certified value (μg L−1)	Accuracy (%)
Al	46.84 ± 0.65	49.5 ± 5.0	95	42.8 ± 1.7	44.4 ± 5.1	96
As	0.448 ± 0.039	0.413 ± 0.039	109	2.258 ± 0.030	2.15 ± 0.30	105
Ba	14.6 ± 1.3	14.0 ± 0.5	104	15.96 ± 0.21	14.9 ± 1.1	107
Cd	0.0095 ± 0.0021	0.0060 ± 0.0014	159	1.110 ± 0.014	1.05 ± 0.12	106
Co	0.0607 ± 0.0028	0.05a	121	1.888 ± 0.020	2.05 ± 0.18	92
Cr	0.289 ± 0.044	0.208 ± 0.023	139	1.953 ± 0.010	1.73 ± 0.33	113
Cu	17.07 ± 0.54	17.4 ± 1.3	98	6.01 ± 0.12	6.16 ± 0.61	98
Mg	2752 ± 46	2540 ± 160	108	–	–	–
Mn	4.12 ± 0.32	4.33 ± 0.18	95	2.232 ± 0.016	2.27 ± 0.35	98
Ni	0.589 ± 0.016	0.476 ± 0.064	124	2.396 ± 0.070	2.44 ± 0.53	98
Sr	52.40 ± 0.65	53.6 ± 1.3	98	98.4 ± 1.4	105 ± 6	94
U	0.0908 ± 0.0090	0.093 ± 0.006	98	2.094 ± 0.075	2.03 ± 0.19	103
V	0.360 ± 0.049	0.317 ± 0.033	114	2.170 ± 0.042	2.18 ± 0.25	100

^ainformation value