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For assessing the terrestrial hazard of CdSSe, reference has been made to ecotoxicity data obtained by standard testing on CdTe, a sparingly soluble  Cd-compound. Transformation dissolution data demonstrate that the solubility of Cd in CdSSe is even much lower than the solubility of Cd from CdTe (>100 times lower solubility of Cd in CdSSe, as compared to solubility in CdTe). The ecotoxicity of CdTe was therefore used as a worst case for the ecotoxicity of CdSSe.

For terrestrial ecotoxicology, 6 ecotoxicity studies were performed with Eisenia fetida, Folsomia candida, Lepidium sativum, Phaseolus vulgaris, Secale cereale and soil microbial activity as test species and CdTe as substance. The lowest NOEC was observed for Folsomia candida.

 species NOEC  (g Cd Te/kg DW) reference 
Eisenia fetida 2.1 Vito (2012f)
Folsomia candida 0.01 Notox (2012b)
Lepidium sativum 2.1 Vito (2012g)
Phaseolus vulgaris 2.1 Vito (2012g)
Secale cereale 2.1 Vito (2012h)
Soil microbial activity 2.1 CEMS (2012)

A basic assumption made in this hazard assessment and throughout this CSR, (in accordance to the same assumption made in the EU RA process) is that the ecotoxicity of CdSSe is due to the Cd++ion. As a consequence, terrestrial PNEC in this report are expressed as “cadmium”, not as CdSSe as such, because ionic cadmium is considered to be the causative factor for toxicity.