Table 2.

Trace metal concentrations in seawater used in the oceanic and coastal incubation experiments before any nutrient or aerosol additions were made.

Metal	Background concentration in oceanic experiment water (mean ± SE)	Background concentration in coastal experiment water (mean ± SE)	Estimated mean concentration in open ocean seawater*	Concentration range in open ocean seawater*
Cd	0.04 ± 0.002	0.04 ± 0.005	0.6	0.001–1.05
Co	0.04 ± 0.010	0.05 ± 0.007	0.04	0.003–0.3
Cu	1.4 ± 0.26	1.8 ± 0.084	3	0.4–5
Fe	1.3 ± 0.047	0.73 ± 0.30	0.5	0.03–3
Mn	1.8 ± 0.31	2.1 ± 0.055	0.3	0.06–10
Ni	2.4 ± 0.30	2.7 ± 0.12	8	2–12

The concentrations were within the range of typical values for open ocean water (Sohrin and Bruland, 2011; ranges include surface and deep waters). Units are nmol L^-1

^*Values from Sohrin and Bruland (2011).