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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
transformation / dissolution of metals and inorganic metal compounds
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2009-09-07 to 2010-02-10
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Series on Testing and Assessment No. 29 (23-Jul-2001): Guidance document on transformation/dissolution of metals and metal compounds in aqueous media
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
signed 2009-06-19
Type of method:
flask method
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
< 0.5 µg/L
Element analysed:
Chromium
Loading of aqueous phase:
100 other: mg test item / L
Incubation duration:
24 h
Test conditions:
T = 22.4 - 22.5 °C ; pH = 6.06 - 6.13
Remarks on result:
other: < LOD
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
< 0.5 µg/L
Element analysed:
Iron
Loading of aqueous phase:
100 other: mg test item /L
Incubation duration:
24 h
Test conditions:
T = 22.4 - 22.5 °C, pH = 6.06 - 6.13
Remarks on result:
other: < LOD
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
< 0.5 µg/L
Element analysed:
Chromium
Loading of aqueous phase:
100 other: mg test item / L
Incubation duration:
24 h
Test conditions:
T = 22.4 - 22.5 °C, pH = 8.02 - 8.11
Remarks on result:
other: < LOD
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
< 0.5 µg/L
Element analysed:
Iron
Loading of aqueous phase:
100 other: mg test item / L
Incubation duration:
24 h
Test conditions:
T = 22.4 - 22.5 °C, pH = 8.02 - 8.11
Remarks on result:
other: < LOD
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
< 0.5 µg/L
Element analysed:
Chromium
Loading of aqueous phase:
100 other: mg test item / L
Incubation duration:
7 d
Test conditions:
T = 22.4 - 22.5 °C, pH = 6.02 - 6.1 (6.9 in one sample at 0 h)
Remarks on result:
other: < LOD
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
< 0.5 µg/L
Element analysed:
Iron
Loading of aqueous phase:
100 other: mg test item / L
Incubation duration:
7 d
Test conditions:
T = 22.4 - 22.5 °C, pH = 6.02 - 6.1 (6.9 in one sample at 0 h)
Remarks on result:
other: < LOD
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
< 0.5 µg/L
Element analysed:
Chromium
Loading of aqueous phase:
1 other: mg test item /L
Incubation duration:
28 d
Test conditions:
T = 22.4 - 22.6 °C, pH = 6.03 - 6.11
Remarks on result:
other: < LOD
Type of test:
full transformation/dissolution test - metals and sparingly soluble metal compounds
Mean dissolved conc.:
< 0.5 µg/L
Element analysed:
Iron
Loading of aqueous phase:
1 other: mg test item /L
Incubation duration:
28 d
Test conditions:
T = 22.4 - 22.6 °C, pH = 6.03 - 6.11
Remarks on result:
other: < LOD

Screening Test

at 0.1 g/L

 

52Cr(µg/L)

56Fe(µg/L)

AA76579 pH 6 T24h

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

AA76579 pH 8 T24h

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

Conclusion of the screening test:

Dissolved Fe or Cr concentrations were below the LOD at both pH levels. Therefore, pH 6 was selected for the full test assuming that the dissolution of metal oxides (i.e. this pigment) is maximized at the lower pH (in acidic medium).

Full Test 7 days

at 0.1 g/L pH6

 

52Cr(µg/L)

56Fe(µg/L)

AA76579 T1 day

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

AA76579 T4 days

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

AA76579 T7 days

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

Full Test 28 days

at 1 mg/L pH6

 

52Cr(µg/L)

56Fe(µg/L)

AA76579 T1 day

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

AA76579 T7 days

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

AA76579 T14 days

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

AA76579 T28 days

Mean

n.d.

n.d.

S.D.

-

-

RSD%

-

-

Test conditions:

- The pH was inside of the acceptable range (pH6 +0.2 units) in a range of 6.02 to 6.12

- The temperature was inside of the acceptable range (20 -25 +/- 2) in a range of 22.4 to 22.6

- The O2 -concentration was always above the accaptable limit of 70% in a range of 79.8% to 81.6%

- The within-vessel values and the between-vessel values could not be determined, because the concentrations of Cr and Fe were below the LOD (0.5µg/L for Cr and Fe).

Conclusions:
Transformation/dissolution of chromium iron oxide (24-screening test according to OECD Series 29, loading of 100 mg/L, pH 6 and 8) resulted in metal concentrations that are below the respective LODs for iron and chromium (< 0.5 µg/L). Dissolved metal concentrations were also below the respective LODs after the 7-d test with 100 mg/L at pH 6 and after the 28-d test with 1 mg/l at pH 6. Thus, chromium iron oxide is considered to be environmentally inert.

Description of key information

Chromium iron oxide is considered to be environmentally inert. Transformation/dissolution of chromium iron oxide (according to OECD Series 29: (i) 24 h, loading of 100 mg/L, pH 6 and 8; (ii) 7 d, loading of 100 mg/L, pH 6; and (iii) 28 d, loading of 1 mg/L, pH 6) resulted in metal concentrations that are below the respective LODs for iron and chromium (< 0.5 µg/L).

Key value for chemical safety assessment

Additional information