Brown coals and lignites � Determination of humic acids

2021 ◽  
Keyword(s):  
Humic Acids ◽  
Brown Coals

scholarly journals Extraction and determination of humic acids in carbonaceous gold ores

2019 ◽  
Vol 1347 ◽  
pp. 012127
Author(s):  
Guodong Chen ◽  
Hongying Yang ◽  
Huiqun Niu ◽  
Linlin Tong ◽  
Shuiping Zhong ◽  
...  
Keyword(s):  
Humic Acids ◽  
Gold Ores

TLC Determination of Aquatic Humic Acids

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2567-2570 ◽  
Author(s):  
M. Kaštelan-Macan ◽  
Š. Cerjan-Stefanovic ◽  
D. Jalšovec
Keyword(s):  
Thin Layer ◽  
Quantitative Determination ◽  
Humic Acids ◽  
Visible Spectrum ◽  
Solvent System ◽  
Spectroscopic Methods ◽  
Precise Method ◽  
Adsorption Resin ◽  
Layer Chromatography

Humic acids are mostly determined by spectroscopic methods, although they are not accurate enough, because humic acids possess no maximum absorption at any wavelength in the ultraviolet and visible spectrum. In this contribution the accurate and precise method for aquatic humic acids determination, using thin layer chromatography, was worked out. Previously, humic acids were separated and preconcentrated -from the river water, using macroreticular adsorption resin Amberlite XAD-4, and subsequently determined by TLC. The Chromatographie system was: silicagel HF254(Merck, precoated plates 20 × 20 cm) and NH3 -acetone (60:40,v/v) as a solvent system. Quantitative determination was made by Camag– Turner 111 Fluorimeter, by measuring UV–quenching.

Optimal Parameters for the Production of Humic Acids from Brown Coals with Specific Structural-Group Composition

2019 ◽  
Vol 53 (5) ◽  
pp. 253-261 ◽  
Author(s):  
S. I. Zherebtsov ◽  
K. S. Votolin ◽  
N. V. Malyshenko ◽  
O. V. Smotrina ◽  
J. Dugarjav ◽  
...  
Keyword(s):  
Humic Acids ◽  
Group Composition ◽  
Optimal Parameters ◽  
Structural Group ◽  
Brown Coals ◽  
Structural Group Composition
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