Zinc oxide

pH

Administrative data

Endpoint:

pH

Type of information:

other: report

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: secondary source: EFSA report for authorization of nano ZnO in Food Contact Material

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2015

Report date:

2015

Materials and methods

Test guideline

Qualifier:

no guideline available

Principles of method if other than guideline:

2w% suspensions of nano ZnO coated and uncoated FCM were prepared in demineralized water. The pH was measured and recorded.
The suspensions were subsequently titrated with 0.5M NaOH solution and the pH and zeta-potential were recorded in function of titrated amount of NaOH solution.

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Zinc oxide

EC Number:

215-222-5

EC Name:

Zinc oxide

Cas Number:

1314-13-2

Molecular formula:

ZnO

IUPAC Name:

oxozinc

Test material form:

solid: nanoform

Results and discussion

pH value

pH value 1

pH value:

6.72

Remarks on result:

other: uncoated nano ZnO FCM

pH value 2

pH value:

6.75

Remarks on result:

other: Coated nano ZnO FCM

Applicant's summary and conclusion

Conclusions:

Nano ZnO uncoated FCM has pH at 6.72
Nano ZnO coated FCM has pH at 6.75