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DL-LACTONE CAS N°:79-50-5 - page 48 / 113

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OECD SIDS 3. ENVIRONMENTAL FATE AND PATHWAYS

DL-LACTONE

ID: 79-50-5 DATE: 18.01.2006

At a higher concentration of activated sludge (1000 mg/l activated sludge was observe more adsorption of dl-Lacton observed. The DOC measuremen control, revealed more than

dl-Lactone (100 mg/l) and ss) 18% adsorption by the d within 3 hours. Thereafter, no e by the activated sludge was ts in the additional adsorption 60% degradation (79%) within 14

Reliability:

Flag: 15-MAR-2005

days, which was in obtained after CO2

(1)

valid

without

agreement determina restricti

Test according

to OECD guide

Critical study

for SIDS endp

with the biodegradation pattern tions. on line under GLP. oint

(18)

Type: Concentration: Contact time: Degradation: Result: Deg. product:

aerobic 100 mg/l related to Test substance 28 day(s) = 100 % after 28 day(s) readily biodegradable not measured

Method:

Year: GLP: Test substance:

other: corresponding to OECD guideline 301 C 1983 no as prescribed by 1.1 - 1.4

Reliability: 10-MAR-2005

(2)

valid

with

restrictions

(58)

Type: Inoculum:

Concentration:

aerobic other: activated sludge, mixed domestic and industrial, non-adapted 533 mg/l related to Test substance

Contact time: Degradation: Result: Kinetic:

Control Subst.: Deg. product:

295 mg/l related to DOC 14 day(s) >= 98 % after 14 day(s) inherently biodegradabl

e

1 day(s) 2 day(s) 7 day(s) 9 day(s) 13 day(s) other: none

ca. 97 % ca. 95 % ca. 59 % ca. 33 % ca. 3 %

not measure

d

(Dissolved Organic Carbon)

Method:

Year: GLP: Test substance:

other: Zahn 1983 no as prescrib

  • -

    Wellens test, corresponding to OECD 302B

ed by 1.1 - 1.4

Method:

The standar biodegradab in the refe sources wer (Switzerlan inhabitants input, and sewage trea flow-propor to the indu samples wer

dised in-house Zahn-Wellens test for inherent ility was run as follows (not explicitly described rence, standard lab procedure). Activated sludge e a small municipal sewage works at Therwil d, near Basle), serving approximately 5000

and having no chemical or pharmaceutical industry activated sludge from the Roche in-house pilot tment plant, which is continuously fed a tional sample of the actual Roche chemical effluent strial wastewater treatment plant in Basle. Sludge e rinsed, mixed in equal proportions and

48

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