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DL-LACTONE CAS N°:79-50-5 - page 55 / 113

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OECD SIDS 3. ENVIRONMENTAL FATE AND PATHWAYS

DL-LACTONE

ID: 79-50-5 DATE: 18.01.2006

Ash contents

247300 mg/l

Evaporation residue

739000 mg/l

Conclusion:

A representative wastewater from the dl-lactone synthesis step was well inherently biodegradable in a lab test. Based on this test the Dalry plant received the permission for draining this

Reliability:

Flag: 10-MAR-2005

particular (2) valid Wastewater

aqueous production waste. with restrictions assessment from the in-house

wastewater

GLP but highly standardised test with many years of experience. Critical study for SIDS endpoint

in

a

professional

lab, not laboratory

(26)

3.6 BOD5, COD or BOD5/COD Ratio

Method:

COD

Method: Year: GLP: COD: Method:

Result:

other: chromate titration 1983 no = 1680 mg/g substance An aqueous solution contain titrated with chromate as a oxidation. The amount of ch amount of test substance. Stoichiometric calculation dl-lactone (C6-H10-O3, 130. Stoichiometric reaction

C6

->

6 CO2

H10

->

5 H2O

O3

->

(CO2 or H2O)

Oxygen demand per molecule

ing 100 mg dl-lactone/l was strong oxidiser until full romate-oxygen was related to the

for the complete oxidation of 14 g/mol): Oxygen requirement 12 O 5O

  • -

    3 O

---- 14 O or 7 O2

Molecular mass of oxygen (O

): 15.999 Da (1)

Theoretical oxygen demand (ThOD)

= = =

7*2*15.999/130.14 1.721 g O2/g dl-Lactone 1721 mg O2/g

(1) Source: Coleman & Dewar --- Titrated COD --- Titrated COD = 98% of ThOD

============= (1997).

=

1680

mg

O2/g

Reliability:

(4)

not assignable

26-AUG-2004

Experimental

result

given

a

s the bare number on a lab form. (14) (25)

Species:

other: fish model

BCF:

ca. 0 - 3.2

Method:

other: QSAR calculated

Year:

2004

3.7 Bioaccumulation

UNEP PUBLICATIONS

55

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