Reaction mass of cobalt and copper and iron

Additional information on environmental fate and behaviour

Administrative data

Endpoint:

additional information on environmental fate and behaviour

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Already discussed at the meeting od the competent authorities for Existing Substance regulations

Data source

Reference

Reference Type:

publication

Title:

Methodology for aquatic hazard classification of massive metal forms: the copper case

Author:

Rodriguez, P.H, Adams, W and Delbeke, K.

Year:

2007

Bibliographic source:

Proceeding of the sixth International Copper Conference, Copper 2007, Volume VI pp 217-228

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: Annex 10 GHS

Principles of method if other than guideline:

Transformation/dissolution tests of copper massive materials were carried out between pH 6 and 8 at loadings of respectively 1 and 100 mg/L. Different surface areas were tested. Abbrasion of the materials was observed and therefore additional tests were carried out - with lower loading rates and using an anti-abrasion device.

GLP compliance:

no

Type of study / information:

The lab has participated to the OECD intercalibration exercise

Test material

Test material information

Constituent 1

Reference substance name:

Reaction mass of cobalt and copper and iron

EC Number:

912-664-7

Molecular formula:

Co, Cu, Fe

IUPAC Name:

Reaction mass of cobalt and copper and iron

Details on test material:

Massive materials, characterized by different surface areas

Results and discussion

Any other information on results incl. tables

The releases of copper from massive pieces are lineraly related to the surface area exposed, are influenced by pH (highest releases at at pH 6) and by abrassion at high stirring rates. Abrasion over-estimated the release rates by a factor of 6.7

Determination of the amount of copper in solution from copper massives at different pHs

pH	Surface of a 1mm sphere particle (mm^2/L) at 100 mg/L	Average release	Cu release at 100mg/L
		µg Cu/mm2	µg/L
6	67.42	1.15	77.4
7	67.42	0.190	12.8
8	67.42	0.127	8.6

 

When using the non abrasion device (figure 2), a 7 days surface release at 100mg/L and pH 6 of 6.7 µg Cu/L or 0.15 µg Cu/mm²is obtained at pH 6.   Considering the abrasion effect of a factor 6.7, the release rates at pH 7 and 8 are correspondingly < 2 µg Cu/L

The average release rate from 28 days abrasive transformation/dissolution of a massive particle of 1mm diameter, at pH 6, a loading of 1mg/L corresponds to 3 µg Cu/L.

Applicant's summary and conclusion

Conclusions:

The results from the transformation/dissoluiton tests are key to the classification of copper massive materials.

Executive summary:

For massive copper materials, seven days transformation/dissolution tests were carried out at pH 6, 7 and 8, in accordance to the OECD guidelines (Annex 10 of GHS) using different surface loadings. The results were used to derive the release of copper-ions from 1 mm particles at loadings of 1,10 and 100mg/L. Abrasion of the materials was observed and therefore additional tests were carried out using an anti-abrasion device.

7-days abrasive transformation/dissolution of a massive particle of 1mm diameter, at pH 6, a loading of 100mg/L corresponds to a total release of 77 µg Cu/L and a realease rate of1.15 µg Cu/mm².7-days non-abrasive transformation/dissolution of a massive particle of 1mm diameter, at pH 6, a loading of 100mg/L resulted in much lower total release of (6.7 µg Cu/L)and release rate (0.15 µg Cu/mm2). 

The results from 28 days abrasive transformation/dissolution of a massive particle of 1mm diameter, at pH 6, a loading of 1 mg/L corresponds to2.8 µg Cu/L. Considering that abrasion increases the amount of copper release by a factor 6.7, this corresponds to a non-abbrasive copper release of <1 µg Cu/L.