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EC number: 200-262-8
CAS number: 56-23-5
constants for the reductive dechlorination increased as the reductant
concentrations increased. Fe(II) was more effective reductant than HS-,
resulting in higher rate constants. The contact time of 1 day for the
soil with HS-and that of 4h with Fe(II) showed the highest
reaction rates, respectively. The kinetic rate constants increased as
the pH of soil suspensions with Fe(II) (5.2-8.0) and HS-(8.3-10.3)
increased. Soil column with Fe(II) showed larger bed volumes (13.8) to
reach a column breakthrough than that with HS-(4.0). Fe(II)
treatment showed better removal of CTC in the soil column with the
addition of CaO than HS-treatment did. In contrast, HS-treatment
was not producing toxic products.
degradation of CTC under reductive conditions was simulated in soils
where CTC and the iron(II) (Fe2+)and bisulfide ion (HS-).
Dechlorination of CTC in acidic soil has been observed and the related
kinetic rate constants were measured. Iron(II) was more effective
reductant than the bisulfide ion, resulting in higher rate constants.
The kinetic rate constants were pH dependent and increased with more
alkaline conditions. The purpose of the study was to give evidence on
technical reduction of CTC contamination. The transferability to natural
processes is limited and no valid quantification of the chemical
reactions based on this study can be assessed. However it is evident
that to some extend CTC will be abiotically transformed depending on the
presence of HS-and Fe2+ions.
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