Behavior of iron-cyanides in soil and groundwater at gaswork sites

    Project Details


    The process of degassing coal in order to produce city gas initially produced a raw gas containing hydrogen cyanide HNC).
    The hydrogen cyanide was removed from the raw gas by contact with iron oxides, whereby iron complexed cyanides were formed. The complex iron cyanides are often found as a prussian blue colouration in the soil (ferriferrocyanide).
    Leaching of iron cyanides from cyanide contaminated soils has been investigated in batch laboratory experiments. A strong
    pH-dependency of the leachability was observed with the highest leaching at high pH-values. Also the natural attenuation of the leached iron cyanides under aerobic conditions has been studied by laboratory batch experiments. The use of 14C-labeled iron cyanide and measuring mass balances of degradation products revealed that a slow, but significant degradation of the iron cyanides did take place. In 1999 reporting on results in the form of an article was carried out.
    Effective start/end date01/02/199731/12/2000


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