Table 11

Oxygen consumption rates and percentage inhibition values in the definitive ASRIT test after 3-h contact time
Nominal concentration (mg/l)
 Initial O2 reading (mg O2/l)
 Measurement period (minutes)
 Final O2 reading (mg O2/l)
 O2 consumption rates (mg O2/l/min)
 % inhibition
Control:




R1
 6.9
 10
 2.9
 0.40
 -
R2
 6.6
 10
 2.4
 0.42
 -
R3
 6.9
 10
 2.8
 0.41
 -
R4
 6.3
 8
 3.0
 0.41
 -
Nano cerium oxide:




1000 R1
 6.7
 10
 2.5
 0.42
 [2]
1000 R2
 6.8
 10
 2.8
 0.40
 2
1000 R3
 6.5
 9
 2.9
 0.40
 2
Non-nano cerium oxide:




1000 R1
 6.7
 9
 3.0
 0.41
 0
1000 R2
 6.7
 10
 2.6
 0.41
 0
1000 R3
 6.8
 10
 2.8
 0.40
 2
3,5-dichlorophenol (Reference material):




a) 3.2
 7.3
 10
 4.4
 0.29
 29
b) 10
 7.5
 10
 5.7
 0.18
 56
c) 32
 8.2
 10
 7.4
 0.08
 80
d) 3.2
 7.1
 10
 4.2
 0.29
 29
e) 10
 7.7
 10
 6.0
 0.17
 59
f) 32
 8.2
 10
 7.5
 0.07
 83

R1–R2 controls for nano cerium oxide test

R3–R4 controls for non-nano cerium oxide test

(a – c) reference samples for nano cerium oxide test

(d – f) reference samples for non nano cerium oxide test

Park et al. Particle and Fibre Toxicology 2007 4:12   doi:10.1186/1743-8977-4-12