black copper, copper smelting

Water solubility

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

Test material information

Constituent 1

Reference substance name:

copper

EC Number:

918-452-0

IUPAC Name:

copper

Details on test material:

Representative samples were collected according to standards sampling protocols from the REACH Copper Consortium (in attachment in iuclid 1.4)
B5, description: low Ni content (representative, not sieved granules), sampling code: MC_B5_El LNi_1A_comp0902_0904, lab code: 09TT02791
B5, description: low Ni content (homogenized, drilled, sieved), sample code: MC_B5_El LNi_1B_comp0902_0904, lab code: 09TT02772
B5, description: High Ni content (representative, not sieved granules), sample code: MC_B5_El HNi_2A_comp0902_0904, lab code: 09TT02792
B5, description: high Ni content (homogenized, drilled, sieved), smaple code: MC_B5_El HNi_2B_comp0902_0904, lab code: 09TT02774

Results and discussion

Water solubility

Key result

Water solubility:

< 5 mg/L

Conc. based on:

element (dissolved fraction)

Remarks:

all elements

Temp.:

20 °C

pH:

>= 9.3 - <= 9.9

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.

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/.

The solubility of Pb from the sample 09TT02774 was 48 mg/l. Otherwise both 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	09TT02772	09TT02774
		Average or range	Average or range
pH		9.56-9.90	9.38-9.60
ICP Ag	mg/l	<2	<1
ICP Al	mg/l	<0.2	<0.2
ICP As	mg/l	<0.2	<0.2
ICP Ca	mg/l	0.3	0.2
ICP Co	mg/l	<0.1	<0.1
ICP Cr	mg/l	<0.1	<0.1
ICP Cu	mg/l	<0.25	5
ICP Fe	mg/l	<0.1	<0.2
ICP Mg	mg/l	<0.2	<0.2
ICP Mo	mg/l	<0.3	<0.1
ICP Ni	mg/l	<0.7	<0.2
ICP Pb	mg/l	<1	48
ICP S	mg/l	<5	<0.5
ICP Sb	mg/l	<0.2	<0.2
ICP Se	mg/l	<0.2	<0.2
ICP Si	mg/l	<1	0.4
ICP Sn	mg/l	<0.2	<0.2
ICP Sr	mg/l	<0.2	<0.2
ICP Te	mg/l	<0.2	<0.2
ICP Ti	mg/l	<0.2	<0.2
ICP Zn	mg/l	<1	<0.2

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 Pb and Cu ( low). The pH of the solutions ranged between 9.56 to 9.90, or 9.38 to 9.60.

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 particles, 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.