Diphosphoric acid, copper salt

Toxicity to aquatic plants other than algae

Link to relevant study record(s)

Reference

Endpoint:

toxicity to aquatic plants other than algae

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

REPORTING FORMAT FOR THE ANALOGUE APPROACH
Please refer to read across justification in IUCLID section 13.

Reason / purpose for cross-reference:

read-across source

Key result

Duration:

7 d

Dose descriptor:

NOEC

Effect conc.:

30 µg/L

Nominal / measured:

nominal

Conc. based on:

element (dissolved fraction)

Basis for effect:

growth rate

Validity criteria fulfilled:

not applicable

Conclusions:

One high quality NOEC is available for higher plants. Toxicity data from terrestrial plants (Barley root elongation) demonstrated that the algae model can be used for normalization of the Lemna NOEC values. Therefore a high quality chronic NOEC values for Lemna minor (growth) of 30 µg Cu/L was determined.

Description of key information

One high quality NOEC is available for higher plants. Toxicity data from terrestrial plants (Barley root elongation) demonstrated that the algae model can be used for normalization of the Lemna NOEC values. Therefore a high quality chronic NOEC values for Lemna minor (growth) of 30 µg Cu/L was determined.

Additional information

Data are available on a number of substances containing inorganic copper and read-across is justified on the basis that for the purposes of assessing the ecotoxicology of Copper (II) pyrophosphate (copper(2+) diphosphate) the chemical species of interest is copper. As such studies referring to soluble copper ions from any source are considered to be directly relevant to Copper (II) pyrophosphate. Copper (II) pyrophosphate is considered to contribute to copper toxicity in the environment and as such the data assessment and risk assessment focusses on the copper ion as the phosphate ion is not considered to be toxic.

 

One high quality NOEC is available for higher plants. Toxicity data from terrestrial plants (Barley root elongation) demonstrated that the algae model can be used for normalization of the Lemna NOEC values. Therefore a high quality chronic NOEC values for Lemna minor (growth) of 30 µg Cu/L was determined.

 

Additional information:

A voluntary risk assessment report of copper and copper compounds has been submitted to the European Chemicals Agency by the European Copper Institute (June 2008). This report is based on the industry initiative to perform a voluntary risk assessment on a substance according to the mechanisms of the implementation of the Existing Substance Regulation (EEC) No 793/93 (ESR). The procedure was agreed by the 11thJoint Meeting of the Competent Authorities for the Implementation of Directive 67/548/EEC and ESR Regulation. Italy has been acting as a reviewing Member State for the substance and the risk assessment report has been reviewed by the Technical Committee on New and Existing Substances (TC NES) according to standard operational procedures of the Committee.

 

In accordance with the above mentioned European copper risk assessment, the environmental hazard assessment is based on tests carried out with soluble copper species. Studies reporting quantitative dose responses of Cu(II) ions, delivered from soluble copper compounds to aquatic organisms are used for this assessment.

 

The data presented are considered to be adequate and reliable for the purpose of defining an appropriate classification for the ecotoxicity of Copper (II) pyrophosphate in accordance with Regulation (EC) No.1272/2008 (EU CLP).