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Physical & Chemical properties

Water solubility

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Administrative data

Endpoint:
transformation / dissolution of metals and inorganic metal compounds
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: This is a well designed and reported study conducted in accordance with sound scientific principles.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Report Date:
2012

Materials and methods

Principles of method if other than guideline:
The report aims to describe the 28 days transformation/dissolution behavior of copper minerals in powder form (less than 60µm) in OECD medium pH 6, through an experimental design that follows the recommendations of the United Nations (GHS 2011) and the standard operating procedures
(SOP) proposed by CANMET and LISEC for the transformation / dissolution (T/D) protocol to the ad hoc OECD Validation Management Group (VMG). The developed procedure, called SOP, provide a detailed methodology for T/D that includes instrumentation requirements, reagents quality, procedures for the 7-day and 28-days full test, chemical analyses and a quality assurance program (QA/QC standards). The results of T/D protocol can be used to compare with the existing eco-toxicity reference values to establish the aquatic hazard classification of the tested substances.
GLP compliance:
no
Type of method:
flask method

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder
Details on test material:
Mineral samples were received from “La CorporacionNacional del Cobre de Chile (Codelco)”during 2009. The minerals were crashed and sieved to less than 60 µm. Although several different minerals were evaluated, only results relating to Covellite (CuS) are reported in this summary.Composition of Covellite: Cu 66.46%; S 33.54%.

Results and discussion

Solubility of metal ions in aqueous mediaopen allclose all
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
5.7 µg/L
Element analysed:
Copper
Loading of aqueous phase:
1 mg/L
Incubation duration:
7 d
Test conditions:
pH6
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
14.5 µg/L
Element analysed:
Copper
Loading of aqueous phase:
1 mg/L
Incubation duration:
28 d
Test conditions:
pH6

Applicant's summary and conclusion

Conclusions:
The solubility values as copper for 7 (Acute) and 28 days (Chronic) T/D tests are as follows:
7days mean: 5.7 µg/L (Coefficient of Variation 5%). 7 days solubility: 0.9%.
28 days mean: 14.5 µg/L (Coefficient of Variation 12%). 28 days solubility: 2.2%.
Executive summary:

A study was conducted to determine the transformation/dissolution behavior over a period of 28 days of several copper minerals in powder form (less than 60µm) in OECD medium at pH 6. For the purpose of this summary, only information related directly to the Covellite (CuS) sample are considered. The experimental design followed recommendations of the United Nations (GHS 2011) and the standard operating procedures (SOP) proposed by CANMET and LISEC to the ad hoc OECD Validation Management Group. The SOP provides a detailed methodology for T/D that includes instrumentation requirements, reagents quality, procedures for the 7-day and 28-days full test, chemical analyses and a quality assurance program. The results can be compared with eco-toxicity reference values to establish the aquatic hazard classification of the tested substances.