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Spectroscopic Analysis of the Effects of Alkaline Extractants on Humic Acids Isolated from Herbaceous Peat

Authors :
Li, Liping
Ma, Litong
Lu, Yanan
Wang, Ying
Sun, Shenguang
Source :
Spectroscopy. March, 2024, Vol. 39 Issue 3, p20, 6 p.
Publication Year :
2024

Abstract

To study the effect of various extractants on the structure of peat humic acid, peat humic acid was extracted using [NH.sub.3]*[H.sub.2]O, [Na.sub.2][CO.sub.3], [NaHCO.sub.3], and [Na.sub.2][SO.sub.3] via alkali-extraction and acid-precipitation methods. The extracted peat humic acid was characterized using ultraviolet-visible (UV-vis) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, and fluorescence (FL) spectroscopy. The results showed that the extractants had negligible effects on the content of peat humic acids. [Na.sub.2][CO.sub.3] was found to be the most effective extractant for isolating humic acids from peat, with the highest content of 66.20% and a yield of 32.67%. Moreover, among the extractants used, [NH.sub.3]*[H.sub.2]O resulted in humic acids with the highest aromaticity, and [Na.sub.2][SO.sub.3] yielded humic acids with higher number of hydroxyl groups. [NaHCO.sub.3] yielded humic acids with the most aliphatic ether and lowest aromaticity. [Na.sub.2][CO.sub.3] was the best extractant for isolating humic acids from peat, having the highest content, lowest degree of aromatic polymerization, and highest number of carboxylic acids.<br />Plant organisms gradually form peat through the slow de com position of anaerobic microorganisms under excessive water and insufficient air environments (1). Peat originates from mosses and woody and herbaceous [...]

Details

Language :
English
ISSN :
08876703
Volume :
39
Issue :
3
Database :
Gale General OneFile
Journal :
Spectroscopy
Publication Type :
Academic Journal
Accession number :
edsgcl.786907628