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DL-LACTONE CAS N°:79-50-5 - page 38 / 113

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OECD SIDS 3. ENVIRONMENTAL FATE AND PATHWAYS

--- Half-lives and rate constants at 50 concentrations at preparation of te

pH

t½, h

4(0.05M) avg pH 4.0

3446.3

4(0.05M)

avg

pH 4.0

7(0.05M)

avg

pH 6.9

9(0.05M)

avg

pH 8.37

9(0.5M)

avg

pH 8.93

7(0.05M)

89.6

9(0.05M)

24.3

9(0.5M)

20.2

(1): measured pH at t=0 h/t=2.4 h/t ----- Half-lives and rate constants at 50

----- Extrapolated half-lives and rate co concentrations at t = 0 and EU TGD

4(0.05M) 4.0/4.0/4.0

7(0.05M)

7.0/7.0/6.7

9(0.05M)

8.4/8.4/8.3

9(0.5M)

9.0/8.9/8.9

t½, h 8781.3 725.5 296.7 458.4

concentrations at t = 0 pH

pH 4(0.05M) avg 7(0.05M) avg 9(0.05M) avg 9(0.5M) avg ---

pH 4.0 pH 6.9 pH 8.37 pH 8.93

t½, h

1184.4 97.9 40.1 62.0

1361

1202 339 81.4

Extrapolated half-lives and rate co to nominal concentrations at prepar

EU TGD formula (2) pH

t½, h

4(0.05M) avg 7(0.05M) avg 9(0.05M) avg 9(0.5M) avg -----

pH 4.0 pH 6.9 pH 8.37 pH 8.93

25465.2 662.4 179.9 149.3

1

Extrapolated half-lives and rate co to measured concentrations at t = 0

pH

t½, h

4(0.05M) avg pH 4.0

24844.1

7(0.05M) avg pH 6.9

2046.9

9(0.05M) avg pH 8.37

839.3

9(0.5M)

1297.0

1

4(0.05M)

avg

pH

4.0

72046.6

7(0.05M)

avg

pH

6.9

1874.0

9(0.05M)

avg

pH

8.37

509.0

9(0.5M)

avg

pH

8.93

422.5

Test substance:

38

--- Extrapolated half-lives and rate co to nominal concentrations at prepar

EU TGD formula (2)

pH

t½, h

3

UNEP PUBLICATIONS

------- (2) t½(x °C) = t½(50 °C) * e exp[0.

EU TGD (2003), Part II, p. 49, dl-Lactone from Roche Dalry, batch according to certificate of analysi

formula (2)

t½, d

k

365.9

7.894E-5

30.1

0.000958

12.4

0.002337

19.1

0.001512

t½, d

k

49.5

0.000583

4.1

0.007079

1.7

0.017265

2.6

0.011172

nstants at 2 ation of tes

5 °C relative t solutions and

t½, d 061.0 27.6 7.5 6.2

k 2.722E-5 0.001046 0.003852 0.004642

nstants at 1 and EU TGD t½, d 035.2 85.3 35.0 54.0

2 °C relative formula (2) k 2.79E-5 0.000339 0.000826 0.000534

nstants at 1 ation of tes

2 °C relative t solutions and

t½, d 001.9 78.1 21.2 17.6

k 9.621E-6 0.000370 0.001361 0.001641

08*(50-x)], equation (25 805046, puri s.

). ty 100.0%

1278

1269

1231

514

t½, d

k

143.6

0.000201

3.7

0.007732

1.0

0.028466

0.8

0.034300

nstants at 2

5

°C

measured

226 81.1 =5 d

42.7 21.3

°C relative

to measured

°C relative st solutions

to nominal

DL-LACTONE

ID: 79-50-5 DATE: 18.01.2006

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