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DL-LACTONE CAS N°:79-50-5 - page 40 / 113

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OECD SIDS 3. ENVIRONMENTAL FATE AND PATHWAYS

DL-LACTONE

ID: 79-50-5 DATE: 18.01.2006

Conclusion:

Reliability:

degraded

total ------------------ SimpleTreat 3.1 pr biodegraded in act without primary se respectively 8.5% significant amount

(2)

valid

with

re

Accepted

QSAR

mode

87.3%

91.5%

------

------

100.0%

100.0%

---------------------------------------- edicts 87.3-91.5% of DL-lactone to be ivated-sludge type sewage works (with and dimentation) and the remaining 12.7% to be discharged with the effluent. No s are expected in the sludge or in the air. strictions ls and guidance document.

05-JAN-2006

(51)

Type: Method: Year:

other: distrbution and fat other: computer model. 2005

e in a sewage works model

to air

2.6E-5%

to sludge

0.467%

biodegraded

88.6%

final effluent

10.9%

Method:

Result:

Conclusion:

Reliability:

05-JAN-2006

The following basic data f v1.50: Molar mass = 130.14 g/mol, solubility = 1E6 g/m3, vap (as STP v1.50 does not acc half-life in 2000 mg MLSS/ in both primary, aeration Default values were used f chemical concentration in STP v1.50 predicts the fol -------------------------- Compartments --------------------------

or DL-lactone were entered into STP

or the sewage treatment plant, the influent was set at 4.3 g/m3. lowing mass balance for DL-lactone: ----------------- % of influent -----------------

total

------ 99.97%

------------------------------------------- STP v1.50 predicts 88.6% of DL-lactone to be biodegraded in activated-sludge type sewage works (with primary sedimentation) and 10.9% to be discharged with the effluent.

data temperature = our pressure = 8.44 ept negative logKow l 0.693 h for ready and settling tanks.

12 °C, water Pa, logKow = 0 values), biodegradability STP v1.50

(49)

Accepted

QSAR

model

sludge,

no

significant

Just below 0.5% is expected in the

amounts are expected in the air.

(2)

valid with restrictions

3.3.2 Distribution

Media: Method: Year:

other: air - sediment - soil - water Calculation according Mackay, Level I 2004

Result:

Conclusion:

40

Air

Water

Soil

Sediment

23.2 kg

99958 kg

18.1 kg

0.402 kg

0.0232%

99.958%

0.018%

0.0004%

Level III Model v2.70, Level I static distribution without reaction, total mass in system = 10000 kg

Mass Percentage

In an infinite-time equilibrium distribution model without any reaction or advection, virtually all dl-lactone will partition

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