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Current Project
Chemistry
and the Environment Division (VI)
and
Analytical Chemistry Division
(V)
Number: 2006-039-2-600
Title: Extraction and fractionation
methods for exposure assessment related to trace metals, metalloids
and hazardous organic compounds in terrestrial environments
Task Group
Chairman: Petr
S. Fedotov
Members: Ewa
M. Cukrowska, Pan
Ming Huang, Werner
Kördel, Dmiry
V. Ladonin, Manuel
Miró, Willie
J. G. M. Peijnenburg, and Rainer
Wennrich
Objective:
- Critical evaluation of traditional single and sequential extraction
schemes as well as novel flow-through fractionation methods for
the assessment of environmental exposure related to trace elements
(heavy metals, metalloids) and persistent organic pollutants in
soils, sediments, compost, and sewage sludge
- Establishment of a series of recommendations for accurate and
comprehensive studies on the current or potential mobility/ bioavailability
of hazardous compounds in solid phase-soil solution systems
Description:
Accumulation of heavy metals, arsenic, and organic pollutants
(e.g. polycyclic aromatic hydrocarbons, polyhalogenated species
and pharmaceutical residues) in different compartments of the biosphere,
and their possible mobilization under environmentally changing conditions
cause adverse health effects. Correct exposure analysis concerned
with soils, sediments, and sewage sludges as sinks for trace elements
(TE) and persistent organic pollutants is extremely important for
environmental management and risk assessment. This problem is currently
attracting a great interest and widely discussed in the literature:
A. Sahuquillo et al. (Trends Anal. Chem., 2003, 22, 152;
doi:10.1016/S0165-9936(03)00303-0);
J.R. Dean and W.C. Scott (Trends Anal. Chem., 2004, 23, 609;
doi:10.1016/j.trac.2004.06.008);
IUPAC book "Biophysico-Chemical Processes of Heavy Metals and
Metalloids in Soil Environments" (project
#2004-003-3-600) etc. Nevertheless, existing data are
somewhat disembodied and there is a need for critical evaluation
and generalization of reported information, particularly taking
into account recent developments in flow-through extraction methods
that enable to mimic natural dynamic conditions more correctly than
the batchwise counterparts.
The aim of this proposal is to review at a fundamental level the
progress made by different authors and institutions (e.g.
in the framework of EC Standards, Measurement and Testing Programme)
and then provide a series of recommendations on the use of batchwise
and flow-through leaching/extraction methods for appropriate exposure
analysis of TE and organic pollutants in contaminated soils, sediments,
and sludges of different type and origin. It is of particular importance
to demonstrate that similar methodologies have a great potential
for the exposure assessment of both organic and inorganic contaminants.
Specific objectives of the proposed work are as follows:
-
critical evaluation of recent developments in
the field of harmonization of leaching tests;
-
generalization of extraction methods for assessing
bioavailability of hazardous organic compounds in contaminated
soils, sediments, and sludges;
-
evaluation of the performance of flow-through
leaching methods (extraction in microcolumns, rotating coiled
columns, and stirred flow cells) when applied to fractionation
explorations in certain scenarios taking into account both the
type of contamination and the homogeneity of samples under study.
If
you want to update this information, contact us by e-mail
Do not forget to include the Project Number,
your name and relation with that project
Page last modified 26 July 2007.
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