TABLE 1.

Sediment ⁶⁵Cu concentrations from experiments with freshly spiked sediment and sediment aged for 2 years.

Compound	Nominal conc.	Freshly spiked sediment (µg 65Cu g−1 dw sed)		Two-year aged sediment (µg 65Cu g−1 dw sed)
		T0, fresh	Tend, fresh	T0, aged	Tend, aged
65CuCl2	0	0.2 ± 0.2	0.1 ± 0.0	0.3 ± 0.2	0.4 ± 0.1
	18	18.1 ± 0.3	17.1 ± 2.7	21.2 ± 0.3	19.1 ± 4.3
	53	52.9 ± 1.8	49.0 ± 4.8	64.3 ± 0.6	56.7 ± 10.2
	112	112.1 ± 2.3	111.8 ± 1.9	129.2 ± 2.0	86.2 ± 32.8
	227	227.3 ± 6.1	232.4 ± 12.2	256.1 ± 1.4	203.6 ± 4.5
65CuO NP	0	0.1 ± 0.2	0.1 ± 0.0	0.2 ± 0.1	0.4 ± 0.2
	3	3.2 ± 0.2	0	3.4 ± 0.1	3.6 ± 0.7
	8.9	8.9 ± 0.1	7.7 ± 1.3	9.7 ± 0.2	8.2 ± 0.5
	18	17.9 ± 0.5	14.8 ± 1.1	19.9 ± 0.2	21.5 ± 1.8
	36.5	36.5 ± 6	31.9 ± 1.5	41.0 ± 0.5	39.8 ± 8.4

For the experiment with freshly spiked sediment, sediment samples were collected after spiking (i.e., at exposure initiation; T_{0, fresh}), and after exposure termination (T_{end, fresh}). For experiments with aged sediment, sediment samples were collected after aging (at exposure initiation; T_{0, aged}) and at exposure termination (T_{end, aged}). Concentrations are presented as mean ± SD; µg ⁶⁵Cu g⁻¹ dw sediment. n = 3 for all samples, except for T_{0, aged}, where n = 2.