Thermal stability of solid and aqueous solutions of humic acid

Characterization of the volatile fraction of laboratory-generated aerosol particles by thermodenuder-aerosol mass spectrometer coupling experiments

“…At 300 • C, the MFR for humic and fulvic acids are 58% and 47%, respectively. A recent investigation of the thermal behaviour of a humic acid extracted from Gorleben groundwaters by using thermogravimetric analysis (TGA) was reported by Kolokassidou, Pashalidis, Costa, Efstathiou, and Buckau (2007). Their results showed that the mass loss of humic acid at 300 • C was around 18%, which is lower than that in this study (42%).…”

“…These differences might be related to humic acid origins, and therefore their chemical composition, and also the measurement methods. The experiment of Kolokassidou et al (2007) was performed under inert-gas atmosphere, which is also different from that in this study.…”

Study on water-dispersible colloids in saline-alkali soils by atomic force microscopy and spectrometric methods

“…Figure 4 shows the UV absorption spectra of the standard humic acid solution, the original water extraction solution of the saline-alkali soil, the supernatant after removing water-dispersible colloids and the solution of the water-dispersible colloids redispersed in water. The standard humic acid solution has a broad absorption band ranging from 200 to 400 nm, which is in accordance with previous reports (Kolokassidou et al, 2007). The UV absorption spectrum of the original water extraction solution of the saline-alkali soil is similar to that of the standard humic acid solution.…”

New Composite Materials in the Technology for Drinking Water Purification from Ionic and Colloidal Pollutants

“…Therefore, the aim was to remove manganese from aqueous solutions by treating it with synthesized composite as well as to study and explain the mechanism of composite interaction with manganese aqueous solutions. The composite does not release significant quantity of organic matter in water because it is tightly bonded to bentonite surface [63][64][65]. The degree of manganese removal was more than 94% at a range of initial manganese concentrations from 0.250 to 10 mg/l.…”