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Table 11 Oxygen consumption rates and percentage inhibition values in the definitive ASRIT test after 3-h contact time

From: Initial in vitro screening approach to investigate the potential health and environmental hazards of Envirox™ – a nanoparticulate cerium oxide diesel fuel additive

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
  1. R1–R2 controls for nano cerium oxide test
  2. R3–R4 controls for non-nano cerium oxide test
  3. (a – c) reference samples for nano cerium oxide test
  4. (d – f) reference samples for non nano cerium oxide test