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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 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:
other quality assurance
Type of method:
flask method

Test material

Constituent 1
Reference substance name:
Flue dust, copper-refining
EC Number:
266-966-2
EC Name:
Flue dust, copper-refining
Cas Number:
67711-90-4
IUPAC Name:
flue dust, copper refining
Details on test material:
The studied flue dust samples are fine- grained, the D50 value is for all samples below 20µm. They contain 9.18- 51.0% lead, 0.52- 9.58% copper, 6.3- 43.9% zinc, 0.09- 2.8% arsenic, and 1.15- 14.7% sulfur (see iuclid 4.23)
B11 flue dust from Secondary smelters (representative), sample code: MC_B11_522_xxx_0904, lab code: 09TT03192
B11 flue dust from primary smelter (blast furnace) (dried filtered slime, homogenised), sample code: KGHM_B11_006_0904, lab code: 09TT03514
B11 flue dust from primary smelter (electric furnace) (composite, from one silo), sample code: KGHM_B11_005_0904, lab code: 09TT03513

Results and discussion

Details on results:
Representative samples did not indicate any solubility in preliminary tests.

Any other information on results incl. tables

Table5: Average water solubility calculated from the 16 and 26 days shaking tests.

 

 Sample code

09TT03192

09TT03513

09TT03514

 

 

Average or range

Average or range

Average or range

pH

 

5.20-5.76

12.18-12.21

3.59-3.76

ICP Ag

mg/l

<1

<1

 -

ICP Al

mg/l

0.4

<0.2

2.7

ICP As

mg/l

<0.2

0.9

113

ICP Ba

mg/l

<0.2

ICP Ca

mg/l

55

<0.2

ICP Cd

mg/l

609

<0.1

0.6

ICP Co

mg/l

0.4

<0.1

0.2

ICP Cr

mg/l

<0.1

<0.1

<0.1

ICP Cu

mg/l

3.0

<0.2

<0.2

ICP Fe

mg/l

<0.1

<0.2

8.9

ICP K

mg/l

2133

346

ICP Mg

mg/l

5.2

<0.2

8.4

ICP Mn

mg/l

1.5

<0.1

ICP Mo

mg/l

<0.2

<0.1

ICP Na

mg/l

273

247

121

ICP Ni

mg/l

16

<0.2

<0.2

ICP P

mg/l

<0.5

ICP Pb

mg/l

9

174

80

ICP S

mg/l

53

687

61

ICP Sb

mg/l

<0.2

<0.2

<0.2

ICP Se

mg/l

<0.2

<0.2

ICP Sn

mg/l

<0.2

<0.2

<0.2

ICP Ti

mg/l

<0.2

ICP Zn

mg/l

2173

2

25

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-C.

The shaking time was for Flue dust 09TT03192 14-16 days and for both Flue dusts 09TT03513 and 09TT0351424-26 days. After that, each sample was equilibrated for 24 h time. Table5 presents measured pH range and average metal concentrations for the samples. The solubility properties of the samples differed from each other. Substances with solubility <10 mg/l are considered low soluble and those with solubility <1 mg/l are considered poorly soluble.

Much of Zn and Cd were dissolved from Flue dust 09TT03192. High concentrations of Pb, S, Na, Ca and K were found to have dissolved from the sample 09TT03513. High concentrations of As, K, Na. Pb, S and Zn were found to have dissolved from the sample 09TT03514. The flue dust samples were visually checked using Tyndall method after centrifugation; the solutions were not filtered after centrifugation. The standard method involves three tests, which is not enough for a statistical analysis.

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 solubility was 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 16 or 24 days, main constituents showed poor solubility, with the exception of K, Ca, Mg and S (high), as well as Cd, As, Pb, Zn and Ni (low to high).

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 behaviour of this difficult to test complex metal containing substance, Transformation/dissolution test would however be more appropriate.

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