Table 2.

pH, PO₂, and PCO₂ levels in artery blood of rats in 72 hrs. after exposure (N = 6, $\stackrel{-}{x}\pm s$).

Exposure group	pH	PO2 (mmHg)	PCO2 (mmHg)
Saline	7.34 ± 0.04	85.33 ± 8.64	47.50 ± 7.39
Nanosilica	7.32 ± 0.03#	66.00 ± 16.02▲	49.50 ± 7.00#
Polyacrylate/nanosilica	7.32 ± 0.05#	66.67 ± 15.70▲∗	49.17 ± 8.51#

^# P > 0.05 when compared with saline group; ^▲ P < 0.05 when compared with saline group; ^∗ P > 0.05 when compared with nanosilica group.