TABLE 4.
Degradation pattern of sodium benzoate in different biodegradation test systemsa
| Test system/parameterb | Sapromat
|
Oxitop
|
CO2 evolution test
|
MCBTS
|
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Oxygen consumption
|
CO2 production
|
|||||||||
| Biodegradation (%) | μmax (day−1) | Biodegradation (%) | μmax (day−1) | Biodegradation (%) | μmax (day−1) | Biodegradation (%) | μmax (day−1) | Biodegradation (%) | μmax (day−1) | |
| Mean | 85.0 | 1.5 | 89.5 | 2.8 | 93.0 | 1.1 | 78.5 | 2.9 | 78.4 | 2.1 |
| CV (%) | 3.6 | 7.2 | 2.9 | 19.2 | 10.2 | 9.6 | 4.2 | 13.9 | 9.4 | 48.2 |
| 95% CIM | 81.9-89.7 | 1.3-1.6 | 86.8-92.2 | 2.2-3.3 | 77.8-100 | 1.0-1.3 | 73.2-83.3 | 2.2-3.5 | 72.2-84.6 | 1.2-2.9 |
a
The test period was 28 days. The number of tests performed was 4 to 6. The lag period varied between 0.8 and 1.5 days.
b
CV, coefficient of variation; CIM, confidence interval of the mean.