Registration Dossier
Registration Dossier
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EC number: 231-157-5 | CAS number: 7440-47-3
Other distribution data
Administrative data
- Endpoint:
- other distribution data
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- 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:
- publication
- Title:
- Chromium(III) Complexation to Natural Organic Matter: Mechanisms and Modeling
- Author:
- Gustafsson, J.P., Persson, I., Oromieh, A.G., van Schaik, J.W.J., Sjostedt, C., and Kleja, D.B.
- Year:
- 2 014
- Bibliographic source:
- Environmental Science and Technology 48, 1753-1761.
Materials and methods
- Principles of method if other than guideline:
- The complexation of Cr(III) with organic soil was studied. Concentrations of 0.31 mmol Cr(III)/g dry soil and 3.1 mmol Cr(III)/g dry soil were tested. A pH range of 2 -7 was studied, with the soils incubated with test substance for 1, 5, 34, 90, and 211 days. Amount of Cr(III) was determined using ICP-MS.
- GLP compliance:
- no
- Type of study:
- other: complexation with natural organic matter
Test material
- Reference substance name:
- Chromium trinitrate
- EC Number:
- 236-921-1
- EC Name:
- Chromium trinitrate
- Cas Number:
- 13548-38-4
- Molecular formula:
- Cr.3HNO3
Constituent 1
Results and discussion
Any other information on results incl. tables
Cr(III) required a long equilibration time, and at pH 2.3, equilibration was still not achieved after 211 days. At pH 3.2, equilibrium was reached after 90 days, and at higher pHs, equilibrium was reached within a month. Cr(III) was strongly bound to the soil. Only at low pH values were significant amounts of dissolved Cr seen.
EXAFS results showed that Cr complexed with 6 O/N atoms in an octahedral fashion showing the development of hydrated and hydrolyzed chromium (III) ions and complexes. Cr existed only as Cr(III).
Applicant's summary and conclusion
- Conclusions:
- Chromium complexation with soil required >= 3 months to reach equilibrium at low pH (pH<4). At higher pHs, equilibrium was reached in less than one month.
- Executive summary:
The complexation of Cr(III) with organic soil was studied. Concentrations of 0.31 mmol Cr(III)/g dry soil and 3.1 mmol Cr(III)/g dry soil were tested. A pH range of 2 -7 was studied, with the soils incubated with test substance for 1, 5, 34, 90, and 211 days. Amount of Cr(III) was determined using ICP-MS. Chromium complexation with soil required >= 3 months to reach equilibrium at low pH (pH<4). At higher pHs, equilibrium was reached in less than one month.
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