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DL-LACTONE CAS N°:79-50-5 - page 53 / 113

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OECD SIDS 3. ENVIRONMENTAL FATE AND PATHWAYS

DL-LACTONE

ID: 79-50-5 DATE: 18.01.2006

Result:

Time

Residual COD

0 (start) 1d 2d 5d 7d (end of test)

mg/l 905 905 860 845 <20

parallel flasks) were areated and continuously stirred with a magnetic stirrer. The chemical oxygen demand in the test flask(s) was determined regularly to follow degradation through the decrease in COD. The technicque for COD determination is not given in the short

relative to COD - 0% 5% 7% >95%

protocol. No mention is made of a possible control substance.

Degradation

Test substance:

Conclusion:

Reliability:

ility test ial lag pha in, attain her 48 hour

following COD se of 5 days ing a total s, ie, by day 7

Basel", not

otherwise

e of 5 days mg/l with id and atta s well inhe on of the a

, aerobic activated sludge ined over 95% by rently ctivated sludge

In an in-house inherent biodegradab decrease, dl-lactone showed an init until very rapid biodegradation set degradation above 95% within a furt from start. Described as "DL-Lakton from Roche specified. After a comparatively long lag phas biodegradation of dl-lactone at 600 at approximately 1 g/l was very rap day 7. In conclusion, dl-Lactone wa biodegradable but did need adaptati

restrictions

bacteria. (2) valid

with

Short

report

from

Roche

Grenzach

(Germany)

Wastewater Section, describing a standard biodegradability test. While there are no

QC

Laboratory,

in-h

ouse inherent

deta

ils in the

report these tests were performed to a highly standardised protocol Roche-internal discharge permits.

on a regular basis according and are used as a basis for Reliability 2.

10-MAR-2005

(7)

Type: Inoculum: Degradation: Result:

aerobic other: activated sludge, not otherwise specified > 70 % after 21 day(s) other: "not readily biodegradable (according to OECD criteria)", hence probably missed 10-d-window criterion

Method: GLP: Test substance:

other: DIN/EN/ISO 7827 (aerobic) no data other TS

Remark:

Test substance:

Conclusion:

No further data on method, year or GLP due to the characteristics of the source, a safety data sheet. Crystalline D-pantolactone, CAS 599-04-2, purity 99% (communication from BASF, 26-Aug-2004). In a safety data sheet for D-pantolactone (one of the two isomers in dl-lactone) from BASF Company in Germany, D-pantolactone was well degradable in a ready biodegradability

test but is stated not to be readily biodegradable according to OECD criteria, meaning that it probably missed the

10-day-window criterion.

Reliability:

(4) The

not assignable safety data sheet

received

source

without

any

experimental

from

BASF

details,

is as

only a condensed is typical for

UNEP PUBLICATIONS

53

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