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EC number: 235-122-5
CAS number: 12070-10-9
Reliable (Klimisch 2) information
for Kp values in soil is based on laboratory studies of the
partitioning of vanadium - added in form of soluble pentavalent V
substances (NH4VO3, Na3VO4 or NaVO3) - between the solid and solution
phase. Information available for sediment and suspended matter is
based on paired monitoring data of elemental V concentrations in
sediment or suspended matter and water.
Regarding partitioning of vanadium
in soil, a study on Kp values for 464 European agricultural soils with
varying properties collected within the framework of the GEMAS project
(Geochemical Mapping of Agricultural and Grazing Land Soil, pH:
3.3-8.0; organic carbon: 0.5-49%; clay: 0.1-70%) is selected as key
study and used for Kd derivation due to the representativeness of the
available dataset (Janik et al., 2010). Log Kp values for added
vanadate range from 1.09 to 4.13 L/kg, with a median of 2.79 L/kg. The
median was selected for the chemical safety assessment. In addition,
44 reliable Kp values from several supporting studies are available
for soils with varying properties (pH: 3.9-8.5; organic matter: 0-20%;
clay: 0.1-54.7%). Log Kp values range from 1.14 to 3.96 L/kg. The 5th,
50th and 95th percentiles of the log Kp values according to the
best-fitting distribution (log logistic) are 1.85, 2.66 and 3.47 L/kg,
respectively. An additional, smaller dataset incorporating 26
partition coefficients derived from 26 spiked soils produced a median
log Kp of 3.46 in a supporting study by Larsson et al. (2016). Field
data available from lysimeter experiments performed on
vanadium-contaminated sites further point to a low mobility of
vanadium in pore water, i.e. mean pore water concentrations of
0.89-1.55 µg V/L with measured total vanadium concentrations of 90.4
mg/kg in soils (Shaheen et al., 2014).
Two reliable Kp values of
non-European sediments are available, i.e. a log Kp value of 5.2 L/kg
for sediments from Hanoi river, Vietnam and a mean log Kp of 4.57 L/kg
for freshwater sediments from South Africa. However, given the wealth
of representative and reliable data provided by the FOREGS Geochemical
Baseline Mapping Programme that aimed to provide high quality
geochemical baseline data for Europe, the assessment of sediment
partitioning of vanadium is based on Kp values derived from a subset
of the FOREGS dataset. Accordingly, a total of 757 paired stream water
and sediment samples covering a wide range of pH, hardness and organic
carbon concentrations of stream water (filtered to < 0.45 µm) and
sediment (wet sieved in the field to <0.15 mm) were processed to
derive a median logKpsolids-water in sediment of 5.06.
Reliable data for Kp of suspended
matter are available for 6 water systems, with log Kp values ranging
from 3.24 to 4.83 L/Kg (median 4.60) for freshwater and a log Kp value
of 4.77 for marine water. Because Log Kp values for freshwater and
marine water seem to be similar, all data are grouped together and the
5th, 50th and 95th percentiles of the log Kp values according to the
best-fitting distribution (log logistic) are determined with 3.82,
4.50 and 5.17 L/kg, respectively. The 50th percentile was selected for
the chemical safety assessment.
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