Yttrium trifluoride

Water solubility

Administrative data

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

22 August 2017 - 20 November 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

column elution method

Test material

Test material information

Constituent 1

Reference substance name:

Yttrium trifluoride

EC Number:

237-257-5

EC Name:

Yttrium trifluoride

Cas Number:

13709-49-4

Molecular formula:

YF3

IUPAC Name:

yttrium trifluoride

Test material form:

solid: particulate/powder

Details on test material:

- Name of test material (as cited in study report): yttrium trifluoride
- Physical state: solid
- Appearance: white powder
- Further information on test material confidential.

Results and discussion

Water solubility

Water solubility 1

Key result

Water solubility:

< 0.03 mg/L

Conc. based on:

element (dissolved fraction)

Remarks:

Y

Temp.:

20 °C

pH:

6

Remarks on result:

other: Expressed as yttrium content in water; mean at flow rates of 12.5 mL/h and 25 mL/h.

Water solubility 2

Key result

Water solubility:

< 0.1 mg/L

Conc. based on:

test mat. (dissolved fraction)

Remarks:

Result calculated based on dissolved Y measurements.

Temp.:

20 °C

pH:

6

Remarks on result:

other: Mean at flow rates of 12.5 mL/h and 25 mL/h.

Details on results:

Results were validated by:
- Linearity validation: The analysis showed a good linearity of the method (r > 0.99).
- Accuracy validation: Results in dilution mixture showed a good accuracy which indicates acceptable data (recoveries ranged between 70 and 110%).
- Repeatability validation: The results indicated a good precision of the data (RSD < 20%).
- Specificity: The intensity (CPS) of blank samples measured was negligible.
- Limit of quantification: 0.015 mg Y/L
- Limit of detection: 0.005 mg Y/L

Any other information on results incl. tables

Results of the preliminary test with milliQ water and at pH 6 were:

Amount of test item weighed (g)	0.1	0.1	0.1	0.1	0.1	0.1	0.01
Volume of water added (mL)	0.1	0.5	1	2	10	100	1000
Solubility (yes/no)	No	No	No	No	No	No	No (after > 96 h of agitation of the test solution)

Results of the main test:

	Solubility expressed as yttrium content in water (mg/L)	Solubility of yttrium fluoride in water (mg/L)	Mean pH measured	Temperature (°C)
Test 1 (flow 25 mL/h)	< 0.02	< 0.03	6	20
Test 2 (flow 25 mL/h)	0.03	0.05	6	20
Mean (Test 1 and Test 2)	< 0.03	< 0.05	6	20
Test 3 (flow 12.5 mL/h)	0.03	< 0.05	6	20
Mean (12.5 mL/h and 25 mL/h)	< 0.03	< 0.05 rounded at < 0.1	6	20

Applicant's summary and conclusion

Conclusions:

The water solubility of yttrium trifluoride was determined to be < 0.1 mg/L at pH 6 and at 20°C. This result was calculated from the measured yttrium content in water which was < 0.03 mg/L (column elution method).