Synthetische Darstellung von Huminsäuren

Humic acid model substances with pronounced redox functionality for the study of environmentally relevant interaction processes of metal ions in the presence of humic acid

“…Potassium peroxodisulfate (K 2 S 2 O 8 ) was used as oxidizing agent (Adhikari et al, 1985;Eller and Koch, 1920). HA type Hyd-Gly and Hyd-Glu were synthesized by oxidation of 2.5 g hydroquinone (99%, Merck, Darmstadt, Germany) in the presence of 1.70 g glycine (p.a., Merck) and 1.89 g glutamic acid monohydrate (puriss.…”

Studies on the Carbon and nitrogen cycles in the Soil. IV. Natural and artificial humic acids

“…(1) Sucrose product. This was prepared exactly according to the method described by Eller (7), in which sulphuric acid is gradually added, with stirring and cooling, to sucrose solution, and the mixture heated for some time at 45° C. and then poured into a large volume of water. The precipitate is washed by decantation until it begins to disperse, and then dried at 40° C.…”

Darstellung und Charakterisierung von Huminsäure-Modellsubstanzen1

“…findliehen Reduktionsprodukte erfolgte dunnschichtchromatographisch auf Zelluloseplatten.Der Abbau von KOP und CHOP ergab als Hauptabbauprodukt Hydrokaffeesäure, was auf das Vorhandensein von Kaffeesdure im Polymerisat schliel3en läBt. Es ist bckannt, daB durch reduktiven Abbau von Kaffeesãure mit Natriumamalgam Hydrokaffeesaure entsteht(1). Beim Abbau von CHOP tritt auBer Hydrokaffeesaure auch Chinasãure auf.…”