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Administrative data

Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: No GLP study but other quality assurance
Cross-reference
Reason / purpose for cross-reference:
reference to other study

Data source

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

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
GLP compliance:
no
Type of method:
flask method

Test material

Constituent 1
Reference substance name:
Slags, copper refining
EC Number:
266-970-4
EC Name:
Slags, copper refining
Cas Number:
67711-94-8
Molecular formula:
The substance is a UVCB for which it is not possible to provide a molecular formula and a molecular weight.
IUPAC Name:
slag, copper refining
Details on test material:
Sample collection made according to ECI/REACH Copper Consortium Standards Protocols (see IUCLID section 1.4)
Sample Description Sample Code Lab code
B8 copper-rich slag from Secondary smelter MC_B8_531_xxx_0904 09TT03335
B8 Cu-rich slag, from slag concentrator, primary smelter (representative, homogenized) slag concentrate 09TT03987
B8 Cu-rich slag from FSF, primary smelter (representative, homogenized) slag from FSF, primary smelter 09TT05248
B8 Cu-rich slag from anode furnace, primary smelter (representative, homogenized) slag from anode furnace 09TT05247

Results and discussion

Details on results:
23 mg/l S was dissolved from the sample 09TT03987. 14 mg/l Fe and 17 mg/l Si were dissolved from the sample 09TT05248. Otherwise all samples were low-soluble in the water solubility tests

Any other information on results incl. tables

The preliminary test did not indicate any solubility for the studied samples. Approximately 5 g sample and 100 ml water were taken to each test. Specific weighed amounts are given in Appendices A-D of the study report.

The shaking time was 14-16 days. After that each sample was equilibrated for 24 h time. Table 5 presents measured pH range and average metal concentrations for the samples. Substances with solubility <10 mg/l are considered low-soluble and those with solubility <1 mg/l are considered poorly soluble /38,43/.

23 mg/l S was dissolved from the sample 09TT03987. 14 mg/l Fe and 17 mg/l Si were dissolved from the sample 09TT05248. Otherwise all samples were low-soluble. The standard method involves three tests, which is not enough for a statistical analysis.

Table 5: Average water solubility calculated from the 14-16 days shaking tests.

 

 Sample code

09TT03335

09TT03987

09TT05247

09TT05248

 

 

Average or range

Average or range

Average or range

Average or range

pH

 

10.61-10.80

6.36-6.46

8.61-8.75

7.36-8.38

ICP Ag

mg/l

-

-

-

<0.2

ICP Al

mg/l

1.0

<0.2

<0.2

0.8

ICP As

mg/l

<0.2

<0.2

<0.2

<0.2

ICP B

mg/l

<0.3

-

-

-

ICP Ba

mg/l

-

<0.2

0.3

-

ICP Bi

mg/l

-

-

<0.2

-

ICP Ca

mg/l

-

7

-

1.1

ICP Cd

mg/l

<0.1

<0.1

-

<0.1

ICP Co

mg/l

<0.2

<0.2

<0.2

<0.2

ICP Cr

mg/l

<0.2

<0.2

<0.2

<0.2

ICP Cu

mg/l

<2

<4

<0.2

1.2

ICP Fe

mg/l

<0.2

<1

<0.2

14

ICP K

mg/l

-

7

<5

<5

ICP Mg

mg/l

<0.2

9

0.7

0.3

ICP Mn

mg/l

<0.2

<0.2

-

<0.1

ICP Mo

mg/l

<0.2

-

<0.2

-

ICP Na

mg/l

4

5

-

<2

ICP Ni

mg/l

<0.2

<0.2

<0.2

<0.2

ICP P

mg/l

-

-

<1

-

ICP Pb

mg/l

28

<0.2

<0.2

0.3

ICP S

mg/l

<5

23

0.5

0.7

ICP Sb

mg/l

<0.2

<0.2

<0.2

<0.2

ICP Se

mg/l

<0.2

-

<0.2

-

ICP Si

mg/l

<1

1

1.3

17

ICP Sn

mg/l

<0.2

<0.2

<0.2

<0.2

ICP Zn

mg/l

<0.2

<0.2

<0.2

0.7

Applicant's summary and conclusion

Conclusions:
Interpretation of results (migrated information): other: insoluble in preliminary test
Preliminary test did not indicate any solubility of the substance. Flask method test was performed on representative sample of the UVCB, a complex metal containing substance. Validity of the reported results confirmed by Harlan Lab (V. Gretton, 2010)
Executive summary:

Classic definition of solubility does not apply to the UVCB, who is a complex metal containing substance. The usually accepted meaning in that case is (according to ECHA Guidance on information requirements and chemical safety assessment Chapter R.7a) " the composition of the aqueous solution formed at equilibrium under a defined set of conditions". Temperature and the amount of substance added per unit volume of water (i.e. the loading) are the main factors to consider. It was not always possible to establish equilibrium of all components; therefore, time and type of agitation of the vessels have been described. Aqueous solubilities were reported in mg/l.

For this UVCB, preliminary result demonstrated that substance is poorly soluble in water. Major results from the additional flask test were: with a loading of 5g/100ml, and shaking over 14 -16 days, main constituents showed poor solubilities, with the exception of Ca, K, Mg, Na (poor), S, Si, Fe Pb (low) and Cu (low to poor). In particular, 23 mg/l S was dissolved from the sample 09TT03987. 14 mg/l Fe and 17 mg/l Si were dissolved from the sample 09TT05248.

Under these conditions, the report acknowledges that stated solubilities may be higher than reality for some samples (e.g. due to abrasion, difficult to remove tiny undissolved particules, etc).

The reported results from OECD 105 are therefore indicative for the behaviour of the UVCB in water. For the purpose of assessing environmental fate and behaviour of this difficult to test complex metal containing substance, Transformation/dissolution test would however be more appropriate (see iuclid 5.6 T/D available).