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DL-LACTONE CAS N°:79-50-5 - page 51 / 113

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OECD SIDS 3. ENVIRONMENTAL FATE AND PATHWAYS

DL-LACTONE

ID: 79-50-5 DATE: 18.01.2006

Remark:

Result:

0

0

1

0

2

0

3

-4

4

-8

5

-4

6

8

7

32

8

62

9

68

10

73

11

78

12

80

13

82

14

82

15

82

plateau

dl-lactone The default Biodegradat therefore t text entry. The result net degrada in sludge b Degradation Time, d

and calculated as percent degradation.

Kinetic of test substance array in IUCLID 3.5, ion does not allow negative degradation values, he kinetics had to be presented in a Results free

from this test is only given as a printout of the tion curve over time (BOD in test vessel minus BOD lank divided by COD, given as percent).

kinetics, [BOD(dl-lactone)-BOD(blank)]/COD, % Degradation, %

Test substance: Conclusion:

Reliability:

The test was stopped after de and remained there for two da

dl-Lactone

from

Roche, "pure"

dl-Lactone

was

well inherent

respirometric

test.

There

was

of

two

days

of

0%

relative

de

minus

sludge

blank

BOD),

then

degradation

until

the

degrada

attaining

80%

within

7

days

f

lag (2)

phase suggests adaptation valid with restrictions

gradation had reach ys. , not otherwise cha ly biodegradable in

an initial lag pha gradation (test sub

just under four da tion curve starts r rom crossing the ze

of the (non-adapte

ed a plateau

racterised.

this se consisting stance BOD ys of negative ising steeply, ro line. The d) sludge.

Biodegradability

assessment

f

not

GLP

but

highly

standardis

laboratory

with

many

years

of

rom the in-house wa ed test in a profes experience.

stewater lab, sional

10-MAR-2005

(25)

Type: Inoculum:

Concentration: Contact time: Degradation: Result: Kinetic:

aerobic other: activated sludge, mixed domestic and industrial, non-adapted 1000 mg/l related to Test substance 21 day(s)

  • >

    98 % after 21 day(s)

inherently biodegradable

3 day(s)

ca. 97 %

7 day(s)

ca. 90 %

14 day(s)

ca. 31 %

21 day(s)

<1%

Control Subst.:

other: peptone/yeast extract as substrate for co-metabolic degradation

Kinetic: Deg. product:

21 day(s) not measured

<1%

Method: Year:

other: comparable to OECD Guide-line 302 C 1983

UNEP PUBLICATIONS

51

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