Calcination products of titanium dioxide, tin monoxide, zinc oxide and dihydrogen wolframate

Additional information on environmental fate and behaviour

Administrative data

Endpoint:

additional information on environmental fate and behaviour

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP and OECD guideline compliant study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: OECD 29

Deviations:

no

Principles of method if other than guideline:

The transformation/dilution of the individual inorganic building blocks of this substance (i.e., the elements Sn and Zn) were estimated according to OECD 29.

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Calcination product of titanium dioxide, tin monoxide, zinc oxide and dihydrogen wolframate

EC Number:

941-788-4

Molecular formula:

Ti 1 Sn 0,6 Zn 0,5 W 0,15 O 4

IUPAC Name:

Calcination product of titanium dioxide, tin monoxide, zinc oxide and dihydrogen wolframate

Details on test material:

- Physical state: solid, red
- Analytical purity: > 99 %
- Storage condition of test material: room temperature

Results and discussion

Any other information on results incl. tables

The 24 h screening measurements were performed with a concentration of the test item of 100 mg/l. At pH = 6, approx. 0.23 mg/L Zn and less than 0.001 mg/L Sn were found in the solution, after 24 hours of leaching time. The same procedure was performed at pH = 8.5 and the concentration of both metals were found to be less than 0.03 mg/l. Therefore, the full test was conducted at the most relevant pH with respect to ecotoxicology, i.e. at pH 6. The results are presented in the following tables:

Sampel time [h]	Metal concentration at ca. 1 mg/L loading
	Zn [mg/L]			Sn [mg/L]
24	< 0.005	0.006	< 0.005	< 0.001	< 0.001	< 0.001
48	< 0.005	0.011	< 0.005	< 0.001	< 0.001	< 0.001
72	< 0.005	0.010	< 0.005	< 0.001	< 0.001	< 0.001
96	0.005	0.009	< 0.005	< 0.001	< 0.001	< 0.001
168	0.007	0.010	0.005	< 0.001	< 0.001	< 0.001

 

Sampel time [h]	Metal concentration at ca. 10 mg/L
	Zn [mg/L]			Sn [mg/L]
24	0.025	0.024	0.026	< 0.001	< 0.001	< 0.001
48	0.026	0.025	0.027	< 0.001	< 0.001	< 0.001
72	0.025	0.025	0.028	< 0.001	< 0.001	< 0.001
96	0.021	0.021	0.025	< 0.001	< 0.001	< 0.001
168	0.023	0.023	0.026	< 0.001	< 0.001	< 0.001

 

Sampel time [h]	Metal concentration at ca. 100 mg/L
	Zn [mg/L]			Sn [mg/L]
24	0.22	0.22	0.22	0.001	0.001	0.002
48	0.22	0.22	0.22	0.001	< 0.001	0.001
72	0.22	0.22	0.22	< 0.001	< 0.001	0.001
96	0.19	0.19	0.21	< 0.001	< 0.001	0.001
168	0.19	0.19	0.20	< 0.001	< 0.001	< 0.001