The method of Cd, Pb, Zn, and Cr immobilization in alkali-activated slag cement mortars and Portland cement
mortars are evaluated. It has been found that
differential
pulse anodic stripping voltammetry enables the determi
nation of trace amounts (from 0.1 to 400 μg/L) of Cd, Pb,
and
Zn in extract solutions obtained as a result of leaching
the metals from cementitious materials. The heavy
metals
were determined by anodic stripping voltammetry after
the UV mineralization of water extracts performed to
destroy
organic surfactants and sulfide present in the solutions.
To determine the chromium amounts in the extracts (20
μg/L−200 mg/L), several polarographic, adsorptive stripping
voltammetric, and spectrophotometric methods were tested.
The spectrophotometric method with diphenylcarbazide
has been selected as it possesses the required sensitivity
and enables the speciation studies. Precision and ac
curacy data of the applied methods are presented along with
comparative studies using AAS and ICP AES analysis of
the extracts. It has been found that the proposed
method
enables the immobilization of 1% addition of Cd, Pb, Zn,
and Cr(VI) to the cement matrices with the final
efficiency
of 99.9%, 99.9%, 99.9%, and 98.8−99.6%,
respectively.
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