Registration Dossier

Administrative data

Endpoint:
adsorption / desorption, other
Remarks:
Fruendlich's coefficient for inorganic substances
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Peer reviewed research paper considering the impact of vanadium in soil.
Methods specific for inorganic substances are used; 'standard' methods are not applicable.

Data source

Reference
Reference Type:
publication
Title:
VANADIUM BIOAVAILABILITY AND TOXICITY TO SOIL MICROORGANISMS AND PLANTS
Author:
MAJA A. LARSSON, et al
Year:
2013
Bibliographic source:
Environmental Toxicity and Chemistry 32, 2266-2273

Materials and methods

Test guideline
Qualifier:
equivalent or similar to
Guideline:
EPA OPPTS 835.1220 (Sediment and Soil Adsorption / Desorption Isotherm)
Version / remarks:
Soils tested
Principles of method if other than guideline:
Five soils with contrasting properties were treated with different doses of dissolved vanadate
The lower thresholds were in the concentration range of the background vanadium in the untreated control soils at 15 - 58 mg vanadium /kg
GLP compliance:
not specified
Type of method:
batch equilibrium method
Media:
soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Radiolabelling:
no

Study design

Test temperature:
20 C

Batch equilibrium or other method

Analytical monitoring:
yes
Matrix propertiesopen allclose all
Matrix no.:
#1
Matrix type:
other: Calcic Cambisol soil
% Clay:
ca. 24
% Org. carbon:
ca. 0.5
pH:
ca. 7.8
CEC:
ca. 14.1
Matrix no.:
#2
Matrix type:
other: Eutric Cambisol
% Clay:
ca. 29
% Org. carbon:
ca. 2.5
pH:
ca. 5.5
CEC:
ca. 10.2

Results and discussion

Adsorption coefficientopen allclose all
Sample No.:
#1
Type:
other: Freundlich Coefficient
Value:
26 dimensionless
pH:
7.8
Temp.:
20 °C
Matrix:
Calcic Cambisol
% Org. carbon:
ca. 0.5
Sample No.:
#2
Type:
other: Freundlich coefficient
Value:
188 dimensionless
pH:
5.5
Temp.:
20 °C
Matrix:
Eutric Cambisol
% Org. carbon:
ca. 2.5

Applicant's summary and conclusion

Conclusions:
Adsorption higher in the case of high clay and high organic matter, but vanadium will readily exchange in soils suggesting high mobility in soil.