Comparative toxicity study of three surface-modified titanium dioxide nanoparticles following subacute inhalation

Table 3 Retention half-times during a 94-day exposure-free period

Half-times (days)	NM-103	NM-104	NM-105
Low exposure concentration	59	85	46
Mid exposure concentration	162	267	204
High exposure concentration	373	315	485

ISSN: 1743-8977