Table 6.

Comparison of EC₅₀ values for some NMs and classification in aquatic toxicity categories. The classification into toxicity categories is color-coded as follows: values that are in the VHT/A1.1 category have dark red shading, in HT/A1.2 have red shading, in MT/A2 have orange shading, in ST/A3 have yellow shading and in PNT/A4 have green shading.

NMs Based on:	EC50 Value (mg/L) for Aquatic Organisms			Tox. Cat. for Mean EC50 for All Assays
	Algae 72 h Test	Duckweed 168 h (7 d) Test	Daphnid 48 h Test
Carbon NT	29.9  [166]	NDA	>100  [23]	N/A
Fullerene	NDA	NDA	11  [167]	N/A
Graphene	20  [140]	NDA	20  [167]	N/A
Cerium	NDA	NDA	52.42 **  [168]	N/A
Cadmium	3.5 *  [169]	0,45  [170]	0.33 *  [169]	1.427
Copper	0.7  [23]	0,84  [171]	0.9  [23]	0.813
Gold	0.048  [172]	NDA	>30  [23]	N/A
Iron	0.07  [173]	>100  [173]	43.41  [173]	48.16
Platinum	NDA	0.213  [174]	0.444  [174]	N/A
Silver	0.003  [23]	0,03  [175]	0.003  [23]	0.012
Titanium	6.8  [23]	>90  [176]	29.5  [176]	42.433
Zinc	0.14  [23]	NDA	1.87  [23]	N/A
AVERAGE EC50	6.795	32.255	24.323

NDA=no data available; N/A not applicable; * if there was no data on EC₅₀, the value of other concentrations, such as IC₅₀ or median lethal concentration (LC₅₀), were entered in the table; ** if there was no data regarding EC₅₀ at the standard test time interval, the value of the concentrations at other time intervals were entered in the table;