How to consider engineered nanomaterials in major accident regulations?

Environmental Sciences Europe

Table 2 EC ₅₀ values (mg/l) for Daphnia for different ENM: comparison between nano-form and microform/dissolved metals

	EC₅₀*Daphnia*
	ENM lowest reported value (mg/l)	Larger particles or dissolved ions^d	Rounded ratio (nano/micro)
Nano-TiO₂	0.03 [55]^a	>100 [56]	>1:100 (for the photocatalytically active form)
Nano-ZnO	0.62 [57]^b	1.86 [58]^e	1:1
CNT	1.8 [57]^c	-	-
Nano-Ag	0.001 [32]	0.0015 [59]	1:1

^aOther values (in mg/l): 0.8 [60], 3.8 [61]; ^bother values (in mg/l): 1 [56], 3.95 [62]; ^cother value (in mg/l): 50.9 [63]; ^dfor Ag and ZnO, the values for the dissolved metals were taken; ^eother value (in mg/l, for micro-ZnO): 1 [56].