Pentene

Biodegradation in water: screening tests

Administrative data

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Study ended in April 1984

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study conducted in accordance with generally accepted scientific principles, possibly with incomplete reporting or methodological deficiencies, which do not affect the quality of the relevant results.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1984

Report date:

1985

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

other: Annex V of the 6th Amendment (79/931/EEC) of the EEC Directive

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test)

Deviations:

no

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Pentene

EC Number:

246-916-6

EC Name:

Pentene

Cas Number:

25377-72-4

Molecular formula:

C5H10

IUPAC Name:

pent-1-ene

Details on test material:

- Name of test material (as cited in study report): pentene-1

- Physical state: Colourless volatile liquid.

- Analytical purity: 94.4%

- Lot/batch No.: ST83/065

- Stability under test conditions: The test substance was judged to have been stable for the duration of this study.

- Storage condition of test material: In the dark at ambient temperature.

Study design

Oxygen conditions:

aerobic

Inoculum or test system:

not specified

Duration of test (contact time):

28 d

Initial test substance concentration

Initial conc.:

2 mg/L

Based on:

test mat.

Results and discussion

% Degradation

Parameter:

% degradation (O2 consumption)

Value:

>= 3 - <= 10

Sampling time:

28 d

Remarks on result:

other: calculated based on theoretical oxygen demand mg O/mg test substance

Details on results:

The test substance pentene-1 was oxidised to 3 - 10% of the theoretical oxygen demand by day 28. The shape of the biodegradation curve suggests that a lag period of at least 5 days occurred before any degradation started and that degradation would have continued after 28 days.
Slight inhibition of microbial activity, as seen in the positive control group, under test conditions is not considered to be significant.

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Interpretation of results:

other: not readily biodegradable

Conclusions:

Pentene-1 was tested in the Closed Bottle test which is suitable for such volatile compounds. In this test the amount of oxygen consumed
in 28 days was only 3 - 10% of the theoretical oxygen demand.
Pentene-1 caused no significant inhibition of the microorganisms in the test system. Pentene-1 was not "readily biodegradable" in this test.

Executive summary:

Pentepe-1 was tested in the Closed Bottle test which is suitable for such volatile compounds. In this test the amount of oxygen consumed

in 28 days was only 3 - 10% of the theoretical oxygen demand.

Pentene-1 caused no significant inhibition of the microorganisms in the test system. Pentene-1 was not "readily biodegradable" in this test.

There are no information available regarding the GLP status of test facility however the test followed the adopted test guidelines. Therefore a

reliability of 2 is assigned.