Beitrag zur mikromorphologischen Differenzierung von durchschlämmter Parabraunerde, Podsol-Braunerde und Humus-Podsol

The Preparation of Mammoth-Sized Thin Sections

“…Catalyst and accelerator should never be mixed at the same time with the plastic as this may produce a violent explosion. It can be noted here that a somewhat modified procedure is also possible (ALTEMÜLLER, 1962; ANONYMOUS 2, no date). In this case a stock solution is made of plastic, monostyrene and accelerator.…”

“…4 B). Water is not used for the cooling, but the volatile Shell oil V-0847, after the German micromorphologists (KUBIENA; ALTEMÜLLER, 1962). Water causes the equipment to rust and various soil components, such as clay minerals and organic matter to swell up, even in a completely impregnated and thoroughly hardened sample.…”

“…After every stage of grinding the preparations should also be thoroughly cleaned in petrol with a soft brush. Fire or explosion risk make a high flash-point petrol advisable for this purpose (ALTEMÜLLER, 1962). Provided the necessary precautions are observed however, ordinary cleaning petrol is also very suitable for cleaning.…”

“…30 microns). Here again denser samples require repeated impregnation (ALTEMÜLLER, 1962). Building on the work of ALTEMÜLLER and also using Vestopal-H, the authors have developed a method for preparing thin sections only 15 microns (or less if required) thick and as large as 8 X 15 cm.…”