Environmental Engineering Reference
In-Depth Information
Chapter 6
M
OBILITY OF
C
ADMIUM IN
C
OAL
F
LY
A
SH
Eleonora Sočo
*
and Jan Kalembkiewicz
Department of Inorganic and Analytical Chemistry, Faculty of Chemistry,
Rzeszów University of Technology,
Powstańców Warszawy Ave. 6, Rzeszów, Poland
A
BSTRACT
Influence of Cd(II) occurs in coal fly ash on the biochemical
reactions in the environment depends among others on possibility of its
getting from coal fly ash to coal fly ash solutions. Evaluate of functional
speciation of cadmium in fly ash by the various methods of sequential
extraction was performed (Tessier et all. [1, 2], Rudd [3], BCR [4-7],
Gatehouse [8], Kersten and Förstner [9], Psenner [10], Sposito [11]) in
order to characterize chemical fractions. It was found that cadmium
determination depends on the method used and varies from 36% (BCR)
to 92% (Tessier) of cadmium detection in coal fly ash (19.0 mg·kg
-1
).
Quantitative evaluation of chemical fraction of Cd in coal fly ash by
methods of sequential extraction was carried out by Tessier [1-2],
Gatehouse [8], Kersten and Förstner method [9] and indicated that Cd
desorption increases according to the following order: exchangeable
fraction < carbonate < oxide < organic (sulfide). For other procedures
studied (Rudd [3], BCR [4-7], Psenner [10], Sposito [11]), no reliable
results
were
obtained
for
individual
chemical
fractions.
The
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