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Environmental fate & pathways

Additional information on environmental fate and behaviour

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Endpoint:
additional information on environmental fate and behaviour
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study performed to OECD guidline
Cross-reference
Reason / purpose for cross-reference:
reference to same study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report date:
2010

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: OECD 29, 2001, Guidance on transformation /dissolution of metals and metal compounds in aqueous media
Deviations:
yes
Remarks:
mesocosm pond water used instead of standard media
Principles of method if other than guideline:
Transformation/dissolution behavior of copper slag was assessed through an experimental design that follows recommendations of the OECD 29 guidance document on transformation/dissolution (T/D) (OECD , 2001)
Release study was conducted on 5 different slag materials in 4 loadings for 7 days, stirring rate (100rpm).
As the study aim at “bridging” the results from the slag mesocosm study to other slag, copper smelting materials, the conditions of the copper slag mesocosm study (AUR-001/4-52) were adapted concerning water quality (mesocosm pond water, pH 8), and presence of basalt material.
Three basalt controls with the highest loading of 12500 mg/L were run additionally to two mesocosm water controls. All loadings of all slag materials were added by control basalt fines to a total loading of 12500 mg/L.
This test protocol is based on an experimental procedure of agitating various quantities of different slag crushed fines in control mesocosm water, and sampling and analyzing the solutions after filtration at specific time intervals to determine the concentrations of dissolved metal ions in the water.
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Reference substance name:
Slag, copper smelting
IUPAC Name:
Slag, copper smelting
Details on test material:
This test protocol is based on an experimental procedure of agitating various quantities of different slag crushed fines in control mesocosm water, and sampling and analyzing the solutions after filtration at specific time intervals to determine the concentrations of dissolved metal ions in the water.
Test materials were tested in bulk (original particle size) or crushed/sieved to 1-2 mm (massive materials) as follows;
3512 (bulk)
2987(bulk)
3821 (bulk)
5244 (1-2 mm, mesocosm reference sample)
3181 (1-2mm)
The materials were selected based on the following criteria, applied to the hazard characterisation of the various slags:
-Selection of different material types produced by the industry (granules, stones, fines)
-Selection of materials produced during primary and secondary copper productions
-Selection of materials with relative high measured metal releases during 7 days transformation/dissolution tests, carried out at pH 6 and a loading of 100 mg/l , standard media (Rodriges et al, 2010)

Results and discussion

Any other information on results incl. tables

Table 1: Metals released from test materials under mesocosm-like conditions (water, basalt control) after 7d, corrected by subtraction of basalt control concentrations (ECI-001/7-80)

ECI-001/7-80 / 7 d

3512 Bulk

2987 Bulk

3821 Bulk

5244 1-2mm*

3181 1-2mm

 

 

test item

mg/2L

6250

3012

1504

750

3012

1501

750

377

12497

6253

3017

1503

25005

12504

6255

3012

12499

6254

3015

1506

 

 

Basalt fine

mg/2L

18752

21984

23499

24247

21990

23495

24246

24622

12495

18745

21981

23496

0

12501

18746

21988

12495

18747

21986

23498

 

 

sum

mg/2L

25002

24996

25003

24997

25002

24996

24996

24999

24992

24998

24998

24999

25005

25005

25001

25000

24994

25001

25001

25004

 

 

level in ecotox test

4

3

2

1

4

3

2

1

4

3

2

1

4

3

2

1

4

3

2

1

LOD

LOQ

Al

µg/L

19.3

17.8

10.9

8.4

6.6

9.2

8.2

7.6

bLD

bLD

6.1

9.5

bLD

bLD

bLD

bLD

86.1

31.4

4.8

7.8

3.5

11.5

Cd

µg/L

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

0.7

2.3

Co

µg/L

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

2.0

6.5

Cr

µg/L

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

1.4

4.5

Cu

µg/L

30.9

14.3

3.5

bLD

77.2

44.4

27.5

13.4

15.0

5.6

3.2

bLD

223

107

48.9

26.5

83.5

44.3

23.5

13.5

2.2

7.3

Fe

µg/L

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

7.9

26.2

Mn

µg/L

1.1

bLD

bLD

bLD

1.8

bLD

bLD

bLD

bLD

bLD

bLD

bLD

2.4

1.2

bLD

bLD

8.5

3.8

1.5

bLD

0.9

2.9

Mo

µg/L

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

1.2

3.9

Ni

µg/L

bLD

bLD

bLD

bLD

8.0

4.6

3.0

bLD

2.3

bLD

bLD

bLD

7.1

3.8

bLD

bLD

6.7

4.6

bLD

bLD

1.9

6.4

Pb

µg/L

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

8.9

bLD

bLD

bLD

15.5

bLD

bLD

bLD

8.6

bLD

bLD

bLD

5.9

19.6

Sb

µg/L

bLD

bLD

bLD

bLD

3.3

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

2.6

8.6

V

µg/L

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

bLD

3.2

10.8

Zn

µg/L

3.7

bLD

bLD

bLD

29.6

12.3

4.7

bLD

212.3

66.3

29.1

9.5

119

33.0

10.2

bLD

23.5

10.0

4.5

bLD

2.3

7.5

yellowvalues marked are below the limit of quantification (see last column); bLD= values below the limit of detection. *batch as used in study AUR-001/4-52.

Table2:  Data Summary of table 4. Average metal releases from slag, copper smelting materials after 7 days transformation/dissolution tests under mesocosm-like conditions (water, basalt control), corrected by subtraction of basalt control concentrations (ECI-001/7-80). The metal releases are expressed per gram slag material. 

Sample number

Mean Cu release (µg/g)

Mean Zn release (µg/g)

Mean Pb release (µg/g)

Mean Ni release (µg/g)

1

8.01

1.2

BDL

BDL

2

63.071

16.2

BDL

6.5

3

2.1

21.8

1.4

0.4

4

17.05

6

1.2

0.6

5

15.26

3.3

1.3

1.4

                                                                           

Applicant's summary and conclusion

Conclusions:
The data are of good quality and critical for extrapolation from slag used in mesocosm study to other slags
Executive summary:

Transformation/dissolution test (7 days, 4 loadings, pH around 8) was carried out using a range of slags exposed to the water used for a meosocosm ecotoxicity study on one slag material.

The following metal releases (µg/g slag material) were observed corrected by subtraction of basalt control concentrations The metal releases are expressed per gram slag material. 

Cu 2.1 – 63.07 µg/g

Zn 1.2 – 21.8 µg/g

Pb 1.2 – 1.3 µg/g

Ni 0.6 – 6.5 µg/g

 

The data indicate usually lower release rates from the slags then the ones observed during the classic T/D tests at pH6 (Rodriguze et al., 2010). The difference in solubility could not be entirely explained by differences in pH. Other differences, such as slag-specific characteristics (eg particle sizes and crystalline structure) and medium-specific characteristics (eg DOC) may be responsible for the observed differences among materials and test media.