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DL-LACTONE CAS N°:79-50-5 - page 31 / 113

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OECD SIDS 2. PHYSICO-CHEMICAL DATA

DL-LACTONE

ID: 79-50-5 DATE: 18.01.2006

Conclusion:

1.31E-8

1.02E-8

0.102 hPa ext divided by 10 units convert USES 4.02, 1. converted to

Based on accepted QSAR programs, the Hen for dl-lactone is expected to be smaller In view of the highest value, there may partitioning into the air from aqueous s

rapolated VP 00 g/l WS, ed to atm*m3/mol 03E-3 Pa*m3/mol atm*m3/mol ry's Law Constant KH

than 1E-4 atm-m3/mol. still be some olutions.

Reliability:

(2)

valid with restrictions

Flag: 10-MAR-2005

Accepted Critical

QSAR programmes respectively study for SIDS endpoint

ac

cepted approximation.

(20) (46) (60)

Method:

other (calculat

Year:

2004

GLP:

no

Partition Coeff.: soil-water

log Pow:

< 10

ed): QSAR modelling

Result:

Conclusion:

Reliability:

Flag: 10-MAR-2005

QSAR Organic-ca partition coeff Koc 1

    • 8.74

      (pH 1-8)

    • 8.73

      (pH 10)

0.348 Based on accept partition coeff smaller than 10 significantly t sediment. (2) valid with Accepted QSAR p Critical study

rbon/water icient,

Source

EPISuite v3.11 (PCKOCWIN v1.66) SCiFinder (ACD Solaris V4.67) SCiFinder (ACD Solaris V4.67) USES 4.02 ed QSAR programs, the organic-carbon/water icient Koc for dl-lactone is expected to be . Hence, dl-lactone is not expected to adsorb

  • o

    organic carbon in activated sludge, soil or

restrictions rogrammes. for SIDS endpoint

(20)

(44)

(60)

Result:

Activated-sludge to determined in paral biodegradation test activated sludge at

----------------- dl-lactone added 22 mg/l

-- a

water partition coefficient (Kd) was lel with the OECD301B GLP ready at 3 hours from adding substrate to two concentrations: ---------------------------------------

ctivated sludge 30 mg/l sterilised

Kd no significant adsorption

Conclusion:

100 mg/l ----------------- Adsorption in the remained constant

1

00

f

or

mg dl-lactone/1000 mg/l the first day, then DOC

1 --

000

mg/l

not

sterilised

~

--------------------------

declined in paralle which is interprete At comparatively hi (1000 mg/l) and dl- short-term adsorpti lower concentration dl-lactone/l) there

l d

with the biodegradation to show biodegradation o

gh

concentrations

of

both

lactone on with

(100 mg/l), a 3-hour Kd

there of ~22

s

(30

mg

activated

sludge/

was

no

significant

adsorp

220 l/kg (3h) -------------

activated sludge measurements test kinetics, f dl-lactone. activated sludge is some

  • 0

    l/kg, but at

l, 22 mg tion as

Reliability:

determined

by DOC.

(1) valid

without

restriction

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31

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