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EC number: 950-480-9
CAS number: -
BOD values and %
biodegradation for the reference item sodium benzoate and the test item
Algea Fert Solid K+ in a Manometric Respirometry test.
Day of measurement
n.d. not determined being not working
* start of 10-d window
** end of 10-d window
The ready biodegradability of the test item Algea Fert Solid K+
was assessed in a 28-day biodegradation test following the “Manometric
Respirometry” method according to the following guidelines:
For this purpose, the test item was added to activated sludge
collected from the aeration tank of a civil wastewater treatment plant
and let to stay in contact with the sludge for 28 days under continuous
The tested concentration was 100 mg/L as test item. The
biodegradation was followedby measuring the BOD (Biochemical Oxygen
Demand) of the test item under defined conditions by means of a
The test item is considered to be stable at the test conditions
for a time corresponding to the exposure time (28 days). Therefore, all
reported results are related to the nominal concentration of the test
The COD values were calculated to be equal to 1.86 mg O2/mg
for reference Item and 0.71 mg O2/mg for test item.
The oxygen consumption due to nitrification was measured at the
begging and at the end of the test and the absence of nitrification was
test complies with the validity criteria since the mean oxygen uptake in
the inoculum control at the end of test period was 26.5 mg O2/L
and the difference between duplicate values of test item degradation at
the end of the test period was 1.3%. Moreover, the reference item
reached the biodegradation pass level (60%) on the fourth day (67.2%).
The test item Algea Fert Solid K+ was found to be not ready
biodegradable under the conditions applied in a Manometric Respirometry
test, having showed a maximum biodegradation of 45.1% at the end of
10-windows . However, after 17 days by the test start, the test item
reached and exceeded the 60% of biodegradation achieving a maximum value
of 113.4% after 26 days of exposure. Even
so, the test item did not show any inhibitory effects on the
microorganism activity at the tested concentration as demonstrated by
the 25% of biodegradation exceeded in the toxicity control already at
the first day of test period (28.8%)
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