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Environmental fate & pathways

Additional information on environmental fate and behaviour

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Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Results from standard transformation/dissolution test according to OECD.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: OECD guideline series on testing and assessment No29
Principles of method if other than guideline:
The principles are also mentioned in:
The standard Operating Procedure for the transformation/dissolution of metals and sparingly soluble metal compounds. Canmet/lisec. February 2004
A new approach to the hazard classification of alloys based on Transformation/Dissolution . Setac 2008: Integrated Environmental Assessment and Management. Vol 4(1) pp75-93
Aquatic toxicity classification of Nickel Metal Powder. Comments on the Nickel Producers Environmental Research Association (NiPERA). Submitted by the European Nickel Industry Association (ENIA). March 30;2006.
Merag Fact Sheet 08: Classification for effects on the aquatic environment of metals/metal compounds and alloys. Januari 2007
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Cadmium zinc sulfide yellow
EC Number:
232-466-8
EC Name:
Cadmium zinc sulfide yellow
Cas Number:
8048-07-5
Molecular formula:
(Cd1-x.Znx)S
IUPAC Name:
Cadmium zinc sulphide pigment yellow
Test material form:
solid: particulate/powder
Details on test material:
Test item name: cadmium zinc sulphide
Manufacturer: Rockwood (UK)
Batch number:
ECTX-Consult N°:
Test item characterisation
Active ingredient: cadmium, sulfur, selenium
Active ingredient content: na
Other ingredients: na
Purity: 99.999%
Formula: CdZnS
Molecular weight: na

Physical form: powder
Colour: yellow
pH: na
Density: na
Homogeneous: yes
Storage conditions: room temperature in the dark
Expiry date: stable over time
Safe Handling Precautions: na

Results and discussion

Any other information on results incl. tables

The temperature of the test solutions fluctuated between 21.2 and 22.7°C during the tests, the pH remained constant at ± 0.2 units, and the dissolved oxygen concentration was always maintained above 70% (± 5.95 mg/L) of its saturation in air (± 8.50 mg/L). The non-purgeable dissolved organic carbon content (NPDOC) of the (modified) ISO 6341 aqueous media was below the reporting limit (<0.5 mg/L).

The acute (7d) Transformation/Dissolution Test on CdZnS in a standard aqueous medium at pH 6 and with a 1 mg/L loading showed an average dissolved cadmium concentration of 0.61 +/-0.05 μg/L Cd . Based on the composition CdZnS contains 65% (w/w) cadmium. This means that 0.61/650 = 0.09% of the total introduced cadmium went into the test system as dissolved cadmium after 7 days.

The Chronic (28d) Transformation/Dissolution Test on CdZnS in a standard aqueous medium at pH 6 and with a 1 mg/L loading showed an average dissolved cadmium concentration of 1.97 ± 0.63 μg/L Cd. This means that about 0.3% of the total introduced cadmium went into the test system as dissolved cadmium after 28 days.

Applicant's summary and conclusion

Conclusions:
Tests were done according to standard OECD protocol and considered of good quality.
Executive summary:

In this study, a loading of 1 mg/L of CdZnS was agitated at 100 rpm in a pH buffered aqueous medium at pH 6 for 28 days. The solutions were sampled at specific time intervals and the concentrations of dissolved cadmium in water were determined.

The acute (7d) Transformation/Dissolution Test on CdZnS in a standard aqueous medium at pH 6 and with a 1 mg/L loading showed an average dissolved cadmium concentration of 0.61 +/- 0.05 μg/L Cd

The Chronic (28d) Transformation/Dissolution Test on CdZnS in a standard aqueous medium at pH 6 and with a 1 mg/L loading showed an average dissolved cadmium concentration of 1.97 +/- 0.63 μg/L Cd.