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Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

The results of the dissolution/transformation test were compared to literature data on the aquatic toxicity for the elements.

Thus ions were selected that are relevant with a view to potential ecotoxicological effects. In addition, Si was included as it is a main constituent.

Element

100 mg/l medium

100 mg/l medium

10 mg/l medium

10 mg/l medium

1 mg/l medium

1 mg/l medium

1 mg/l medium

1 mg/l medium

Toxicity

(screening in EPA-ECOTOX)

Test period

7 d

7d

7d

7d

7d

7d

28d

28d

 

pH

6.5

8.5

6.5

8.5

6.5

8.5

5.5

8.5

 

Fe, µg/l

<250

<250

<250

<250

<250

<250

<250

<250

EC50 > 5000

Al, µg/l

<50

<50

<50

<50

<50

<50

<50

<50

EC50 > 500

Mn, µg/l

<10

<10

<10

<10

<10

<10

<10

<10

EC50 > 1000

Si, µg/l

1300

710

480

270

<250

<250

<250

<250

EC50 > 100000

F, µg/l

600

300

160

140

<100

<100

<100

<100

EC50 > 10000

Ecotox data for the elements were collected from the EPA-ECOTOX database. The limit listed in the last column of the table is an upper, conservative level covering many tests and species.

It is concluded that the concentration of the elements (ions) that are released from P-slag particles (< 1 mm) in the test do not reach the EC50 values for any of the elements. Thus P-slag will not be acutely toxic at loading rates of 100 mg/l.

The elements solved after 28 days at a loading rate of 1 mg P-slag/l are to be compared to chronic toxicity values (NOEC), that are usually below the acute EC50 by an order of magnitude. Taking this into account it is concluded that the solubility is also sufficiently low as to remain below the NOEC levels.

Due to the poor water solubility aquatic test animals will not be significantly exposed in an aquatic toxicity test. Therefore these tests should be waived.