Table 3.

Nominal size of particles and stabilizing agent along with modelled uptake and depuration rates, with corresponding R² and the remaining residual body burden of Au at the end of a 24 h depuration period in clean Elendt M7 media

Nominal size (nm)	Stabilizing agent	Uptake ratea (L kg−1 dw h−1)	Depuration rate (h−1)	R2	Residual mass (ng Au/µg dw organism)
10	MUDAb	4,112–27,720	0.26 (0.15; 0.37)	0.81	16.1 ± 10.3
30	MUDAb	35–306	0.03 (0; 0.11)	0.68	1.2 ± 0.76
10	Citrate	339–2,911	0.02 (0; 0.09)	0.84	11.2 ± 3.2
30	Citrate	409–2,275	0.10 (0; 0.25)	0.65	1.7 ± 1.0

The values in the parentheses denote the 95 % confidence interval with upper and lower boundary

^aThe range for the uptake rates were derived from Eq. 1 with the initial water phase concentration (lowest value) and the final water phase concentration (highest value) as input parameters. This was done to accommodate for changes in water concentration during the course of the experiment

^bMercaptoundecanoic acid