Magnesium perchlorate

Endpoint summary

Description of key information

- skin irritation: tissue viability 29.5 %, skin irrirtant category 2 (prediction by OECD QSAR Toolbox v4.3.1, 2019; based on experimental results of closely related analogue Lithium perchlorate)

- eye irritation: IVIS value 47.1, eye irritant category 2 (prediction by OECD QSAR Toolbox v4.3.1, 2019; based on experimental results of closely related analogue Lithium perchlorate)

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation / corrosion, other

Remarks:

in silico, (Q)SAR performed with OECD QSAR Toolbox, Read Across analysis

Type of information:

other: (Q)SAR from supporting substance (structural analogue or surrogate) for which an in vivo result is available

Adequacy of study:

key study

Study period:

2019-03-29

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification, with an experimental result (as provided by the OECD QSAR Toolbox)

Justification for type of information:

1. SOFTWARE
OECD QSAR Toolbox v4.3.1

2. MODEL (incl. version number)
Read Across analysis

3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
[Mg+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O

4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
Please refer to 'Attached justification'

5. APPLICABILITY DOMAIN
Please refer to 'Attached justification'

Qualifier:

according to guideline

Guideline:

other: REACH Guidance R.6

Principles of method if other than guideline:

- Software tool(s) used including version: OECD QSAR Toolbox v4.3.1
- Model(s) used: Read Across analysis
- Model description: see field 'Justification for non-standard information' and 'Attached justification'
- Justification of QSAR prediction: see field 'Justification for type of information' and 'Attached justification'

GLP compliance:

no

Remarks:

Not applicable (QSAR calculation)

Specific details on test material used for the study:

SMILES: [Mg+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O

Irritation / corrosion parameter:

% tissue viability

Value:

29.5

Remarks on result:

positive indication of irritation

Interpretation of results:

Category 2 (irritant) based on GHS criteria

Conclusions:

The skin irritating potential of Magnesium perchlorate was predicted with OECD QSAR Toolbox v4.3.1 using experimental results of the analogue Lithium perchlorate (CAS 7791-03-9). Since the perchlorate is considered to trigger the toxicity, this approach is justified. The tissue viability was predicted to be 29.5 %.

Predictions by the OECD QSAR Toolbox v4.3.1 with experimental result(s) of the closely related perchlorate with CAS 7791-03-9 contained therein are used to address the endpoint, which is considered entirely appropriate for the assessment of the skin and eye corrosion/irritation potential of Magnesium perchlorate.

The predicted tissue viability of 29.5 % is below the cut off value for classification, which is As indicated above this prediction is based on the experimental result for the analogue substance Lithium perchlorate. In comparison closely related perchlorates like Potassium, Sodium and Ammonium perchlorate are neither classified as skin irrit. 1 nor as skin irrit. 2 in accordance with Annex VI of Regulation (EC) No. 1272/2008 (CLP Regulation). Furthermore Magnesium is known to be non-toxic to human health, while Lithium is known to be corrosive and classified as corrosive to the skin according to Regulation (EC) No 1272/2008 CLP (Cat. 1B, H314) and according to Directive 67/548/EEC (R34). Therefore it was considered entirely appropriate to classify Magnesium perchlorate as skin irrit 2 as worst-case assumption.

Executive summary:

The skin irritating potential of Magnesium perchlorate was predicted with OECD QSAR Toolbox v4.3.1 using experimental results of the analogue Lithium perchlorate (CAS 7791-03-9). Since the perchlorate is considered to trigger the toxicity, this approach is justified. The tissue viability was predicted to be 29.5 %.

Predictions by the OECD QSAR Toolbox v4.3.1 with experimental result(s) of the closely related perchlorate with CAS 7791-03-9 contained therein are used to address the endpoint, which is considered entirely appropriate for the assessment of the skin and eye corrosion/irritation potential of Magnesium perchlorate.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation, other

Remarks:

in silico, (Q)SAR performed with OECD QSAR Toolbox, Read Across analysis

Type of information:

other: (Q)SAR from supporting substance (structural analogue or surrogate) for which an experimental result is available

Adequacy of study:

key study

Study period:

2019-03-29

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification, with an experimental result (as provided by the OECD QSAR Toolbox)

Justification for type of information:

1. SOFTWARE
OECD QSAR Toolbox v4.3.1

2. MODEL (incl. version number)
Read Across analysis

3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
[Mg+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O

4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
Please refer to 'Attached justification'

5. APPLICABILITY DOMAIN
Please refer to 'Attached justification'

Guideline:

other: ECHA Guidance R.6

Principles of method if other than guideline:

- Software tool(s) used including version: OECD QSAR Toolbox v4.3.1
- Model(s) used: Read Across analysis
- Model description: see field 'Justification for non-standard information' and 'Attached justification'
- Justification of QSAR prediction: see field 'Justification for type of information' and 'Attached justification'

GLP compliance:

no

Remarks:

Not applicable (QSAR calculation)

Specific details on test material used for the study:

[Mg+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O

Irritation parameter:

in vitro irritation score

Value:

47.1

Vehicle controls validity:

not applicable

Negative controls validity:

not applicable

Positive controls validity:

not applicable

Interpretation of results:

Category 2 (irritating to eyes) based on GHS criteria

Conclusions:

The eye irritating potential of Magnesium perchlorate was predicted with OECD QSAR Toolbox v4.3.1 using experimental results of the analogue Lithium perchlorate (CAS 7791-03-9). Since the perchlorate is considered to trigger the toxicity, this approach is justified. The in vitro irritation score was predicted to be 47.1.

Predictions by the OECD QSAR Toolbox v4.3.1 with experimental result(s) of the closely related perchlorate with CAS 7791-03-9 contained therein are used to address the endpoint, which is considered entirely appropriate for the assessment of the skin and eye corrosion/irritation potential of Magnesium perchlorate.

The predicted IVIS value of 47.1 is above the cut-off value of 3 (UN GHS no category) and below the cut-off value of 55 (UN GHS Category 1) as stated in OECD TG 437. Consequently no prediction concerning irritant or severely irritant potential of the test item can be made.
As indicated above this prediction is based on the experimental result for the analogue substance Lithium perchlorate. In comparison closely related perchlorates like Potassium and Ammonium perchlorate are classified as eye irrit. 2, while Sodium perchlorate is not classified as eye irritant at all in accordance with Annex VI of Regulation (EC) No. 1272/2008 (CLP Regulation). In addition Magnesium is known to be non-toxic to human health, while Lithium is classified as corrosive to skin and eye: "causes severe skin burns and eye damage" (Cat. 1B (H314) according to Regulation (EC) No 1272/2008 (CLP) and Corrosive R34 according to Directive 67/548/EEC. Therefore it was considered entirely appropriate to classify Magnesium perchlorate as eye irrit 2 as worst-case assumption.

Executive summary:

Eye irritation of Magnesium perchlorate was predicted with OECD QSAR Toolbox v4.3.1 using experimental results of the analogue Lithium perchlorate (CAS 7791-03-9). Since the perchlorate is considered to trigger the toxicity, this approach is justified. The in vitro irritation score was predicted to be 47.1.

Predictions by the OECD QSAR Toolbox v4.3.1 with experimental result(s) of the closely related perchlorate with CAS 7791-03-9 contained therein are used to address the endpoint, which is considered entirely appropriate for the assessment of the skin and eye corrosion/irritation potential of Magnesium perchlorate.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

The skin irritation and eye irritation of Magnesium perchlorate was predicted with OECD QSAR Toolbox v4.3.1 using experimental results of the closely analogue substance Lithium perchlorate (CAS 7791-03-9). This analogue was tested for its eye irritation and skin irritation according to OECD 437 and OECD TG 439, respectively. Since the perchlorate is considered to trigger the toxicity, this approach is justified and considered as entirely appropriate to draw conclusions on the skin and eye irritation of Magnesium perchlorate. However, the registrant is prepared to conduct an experimental study but considered it as not necessary at first instance taking into account the available results.

Justification for classification or non-classification

- skin irritation: The predicted tissue viability of 29.5 % is below the cut off value for classification, which is </= 50 % as stated in OECD TG 439, identifying a test chemical as requiring classification and labelling according to UN GHS (Category 2 or Category 1). As indicated above this prediction is based on the experimental result for the analogue substance Lithium perchlorate. In comparison closely related perchlorates like Potassium, Sodium and Ammonium perchlorate are neither classified as skin irrit. 1 nor as skin irrit. 2 in accordance with Annex VI of Regulation (EC) No. 1272/2008 (CLP Regulation). Furthermore Magnesium is known to be non-toxic to human health, while Lithium is known to be corrosive and classified as corrosive to the skin according to Regulation (EC) No 1272/2008 CLP (Cat. 1B, H314) and according to Directive 67/548/EEC (R34). Therefore it was considered entirely appropriate to classify Magnesium perchlorate as skin irrit 2 as worst-case assumption.

 

- eye irritation: The predicted IVIS value of 47.1 is above the cut-off value of 3 (UN GHS no category) and below the cut-off value of 55 (UN GHS Category 1) as stated in OECD TG 437. Consequently no prediction concerning irritant or severely irritant potential of the test item can be made. As indicated above this prediction is based on the experimental result for the analogue substance Lithium perchlorate. In comparison closely related perchlorates like Potassium and Ammonium perchlorate are classified as eye irrit. 2, while Sodium perchlorate is  not classified as eye irritant at all in accordance with Annex VI of Regulation (EC) No. 1272/2008 (CLP Regulation). Additionally Magnesium is known to be non-toxic to human health, while Lithium is classified as corrosive to skin and eye: "causes severe skin burns and eye damage" (Cat. 1B (H314) according to Regulation (EC) No 1272/2008 (CLP) and Corrosive R34 according to Directive 67/548/EEC. Therefore it was considered entirely appropriate to classify Magnesium perchlorate as eye irrit 2 as worst-case assumption.