Matte, copper

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

Remarks:

Similar Quality Assurance certificate

Type of method:

flask method

Test material

Test material information

Constituent 1

Reference substance name:

Matte copper

IUPAC Name:

Matte copper

Details on test material:

Sample collection made according to ECI/REACH Copper Consortium Standards Protocols (see IUCLID section 1.4 and 4.1 attachment)
Sample description Sample Code Lab Code
B2 Matte, Flash furnace type (composite from grinded material) AC_B2_625559 09TT02788
B2 Matte, Electric furnace type (composite from grinded material) AC_B2_625208 09TT02787
B2 matte, blast furnace type (composite from grinded material) KGHM_B2 10TT00139
B2 matte, white matte-type (site 2C importer) (representative) El Teniente 09TT07029
B2 matte, white matte-type (site 2D importer) Codelco Norte 09TT07719

Results and discussion

Water solubility

Water solubility 1

Water solubility:

<= 3.1 mg/L

Conc. based on:

element

Remarks:

Silicium

Temp.:

20 °C

pH:

>= 5.85 - <= 9.71

Water solubility 2

Water solubility:

<= 0.4 mg/L

Conc. based on:

element

Remarks:

iron

Temp.:

20 °C

pH:

>= 5.85 - <= 9.71

Details on results:

all elements measured lower DL, except Si= 0,6 mg/l, and Pb= 0,4 mg/l

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. All studied matte and white metal samples were low-soluble in the water solubility tests.

The shaking time was for matte 09TT02787 17-19 days, for matte 09TT02788 3-5 days and for both white metals 09TT07029 and 09TT07719 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.

All matte and white metal 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 3-5, 14-16 and 17-19 days shaking tests.

	Sample code	09TT02787	09TT02788	09TT07029	09TT07719
		Average or range	Average or range	Average or range	Average or range
pH		6.94-9.17	7.51-8.94	8.84-9.71	5.85-6.12
ICP Ag	mg/l	<1	<1	<0.2	<0.1
ICP Al	mg/l	<0.2	<0.2	<0.2	<0.2
ICP As	mg/l	<0.2	<0.2	<0.2	<0.2
ICP Ba	mg/l	-	-	<0.2	<0.1
ICP Ca	mg/l	<2	<0.1	0.2	0.6
ICP Co	mg/l	<0.1	<0.1	<0.2	<0.2
ICP Cr	mg/l	<0.1	<0.1	<0.2	<0.2
ICP Cu	mg/l	<7	<0.4	2.2	4.1
ICP Fe	mg/l	<0.1	<0.1	<0.2	<0.1
ICP K	mg/l	<5	<2	<1	<5
ICP Mg	mg/l	<0.2	<0.2	<0.2	<0.1
ICP Mn	mg/l	<0.1	<1	<0.2	<0.1
ICP Na	mg/l	<2	<2	0.6	<2
ICP Ni	mg/l	<1	<0.1	0.2	0.1
ICP Pb	mg/l	<1	0.4	<0.2	<0.2
ICP S	mg/l	<7	<5	2.1	2.9
ICP Sb	mg/l	<0.2	<0.2	<0.2	<0.2
ICP Se	mg/l	<0.2	<0.2	-	-
ICP Si	mg/l	<2	0.6	2.3	3.1
ICP Sn	mg/l	-	-	<0.2	<0.2
ICP Te	mg/l	<0.2	<0.2	-	-
ICP Zn	mg/l	<0.3	<0.2	0.5	0.3

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 Cu, Zn, S, Si, K an Na where amount measured were slightly above 1mg/l. The pH of the test solutions ranged for all representative samples between 5.8 and 9.7 (ie no extreme ph <2 or>11.5).

Under these conditions, the report acknwoledges 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 behavior of this difficult to test complex metal containing substance, Transformation/dissolution test would however be more appropriate.