Table 4.

Analytical results in μg L⁻¹ for trace elements measured in seawater certified reference materials (mean ± one SD). LOD, limit of detection.

	SLEW-3		CASS-4
	Measured (n = 5)	Certificate value	Measured (n = 5)	Certificate value
V	2.80 ± 0.06	2.57 ± 0.31	1.25 ± 0.11	1.11 ± 0.16
Mn	1.67 ± 0.04	1.61 ± 0.22	2.92 ± 0.01	2.78 ± 0.19
Ni	1.37 ± 0.06	1.23 ± 0.07	0.329 ± 0.043	0.314 ± 0.030
Co	0.033 ± 0.003	0.042 ± 0.010	0.033 ± 0.004	0.026 ± 0.003
Cu	1.63 ± 0.04	1.55 ± 0.12	0.644 ± 0.042	0.592 ± 0.055
Zn	<0.159 (LOD)	0.201 ± 0.037	0.498 ± 0.175	0.381 ± 0.057
As	1.04 ± 0.10	1.36 ± 0.09	1.28 ± 0.14	1.11 ± 0.16
Cd	0.044 ± 0.008	0.048 ± 0.004	0.020 ± 0.006	0.026 ± 0.003
Pb	<0.017 (LOD)	0.0090 ± 0.0014	<0.017 (LOD)	0.0098 ± 0.0036