β-methyl-3-(1-methylethyl)benzenepropanal

Biodegradation in water: screening tests

Administrative data

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

other: Body responsible for the test

Title:

Unnamed

Year:

1993

Report date:

1993

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

β-methyl-3-(1-methylethyl)benzenepropanal

EC Number:

412-050-4

EC Name:

β-methyl-3-(1-methylethyl)benzenepropanal

Cas Number:

125109-85-5

Molecular formula:

C13H18O

IUPAC Name:

3-[3-(propan-2-yl)phenyl]butanal

Study design

Oxygen conditions:

aerobic

Initial test substance concentration

Initial conc.:

100 mg/L

Parameter followed for biodegradation estimation

Parameter followed for biodegradation estimation:

O2 consumption

Reference substance

Reference substance:

aniline

Results and discussion

% Degradation

Parameter:

% degradation (O2 consumption)

Value:

0

Sampling time:

28 d

Details on results:

Degredation of Aniline exceeds 40% after 7 days and 65% after 14 days: the activity of the inoculum is thus verified and the test is considered as valid.
Degredation of Florhydral is negative: this means that the basal respiration of the slude is slightly reduced in presence of Florhydral, suggesting a slight toxic effect. This is also true for the degredation of Aniline in presence of Florhydral for the first 24 days.

BOD5 / COD results

Results with reference substance:

Degredation of Florhydral is negative: this means that the basal respiration of the slude is slightly reduced in presence of Florhydral, suggesting a slight toxic effect.

Applicant's summary and conclusion

Conclusions:

The biodegradation of Florhydral after 28 days in the test condition is 0%.
This means that Florhydral is not readlily biodegradable.
The curves obtained with Florhydral alone and with Florhydral on the micro-organims. In the latter case, this effect disappers after 24 days and degredation starts: this suggests that Florhydral may be degraded after an acclimatization period in some circumstances.

Executive summary:

The Ready Biodegradability of Florhydral has been determined by the Respirometic Method (modified MITI Test 1) according to the OECD Guidelines for Testing of Chemicals, Method No. 301C. Florhydral is not readily biodegradable in the conditions of the test. At the concentration used in the test (100mg/l), it is slightly inhibitory to the micro-organisms, at least during the first 24 days.