Table 2.

Comparison of concentrations and the respective confidence interval (CI; α = 0.05) determined gravimetrically (n ≥ 5) and by means of ICP-QMS after microwave assisted digestion (n ≥ 3) of the ENP stock suspension (SS)

	Ag [g/L]	TiO2 [g/L]	CeO2 [g/L]	ZnO [mg/L]	Au 10 nm [mg/L]	Au 200 nm [mg/L]
Gravimetric	97.1 ± 1.2	5.3 ± 0.2	210 ± 13	684 ± 66	474 ± 143	545 ± 130
Digestion SS	101 ± 11	4.6 ± 0.2	267 ± 4.9	293 ± 21	56.4 ± 2.2	72.5 ± 3.6