Dysprosium trinitrate

pH

Administrative data

Endpoint:

acidity / alkalinity

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 122 (Determination of pH, Acidity and Alkalinity)

Principles of method if other than guideline:

Electrochemic determination of pH: the pH-value of a 10% solution (or slurry) was determined electrochemically at 20°C with a calibrated pH meter (MA 235 Mettler Toledo). This value was recorded.

Determination of the acidic reserve: via titration.

GLP compliance:

no

Remarks:

Company data performed according to an internal method that meets generally accepted scientific principles

Test material

Test material information

Constituent 1

Reference substance name:

Dysprosium trinitrate

EC Number:

233-410-5

EC Name:

Dysprosium trinitrate

Cas Number:

10143-38-1

Molecular formula:

Dy.3HNO3

IUPAC Name:

dysprosium trinitrate

Specific details on test material used for the study:

no details available

Reagents

Reagent:

NaOH solution

Titration of acidity and alkalinity

Details on titrant used:

Determination of the alkaline or acid reserve via titration:
- For the determination of the alkaline reserve: the titration volume (in mL) of a 0.5 mol/L H2SO4 solution, which is required to achieve a pH of 10 of a 10% solution (or slurry) at 20°C, was recorded.
- For the determination of the acid reserve: the titration volume (in mL) of a 1 mol/L NaOH solution, which is required to achieve a pH of 4 of a 10% solution (or slurry) at 20°C, was recorded.

Results and discussion

pH value

Key result

pH value:

0.46

Temp.:

20 °C

Concentration:

10 vol%

Acidity or alkalinity

Key result

Acidity or alkalinity:

acidity

Value:

10.03

Remarks on result:

other: Acid reserve

Any other information on results incl. tables

	pH	Acidic Reserve	Corrosive calculation	Corrosive?
Dysprosium nitrate	0.46	10.03	-0.37	No

Applicant's summary and conclusion

Conclusions:

The pH value of a 10% solution of dysprosium trinitrate was determined to be 0.46 and the acid reserve was 10.03. Based on these data, the outcome of the calculation for corrosivity was -0.37 (> -0.5). Therefore the substance was considered not to be corrosive.