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The acidic functional groups of humic acid

Journal Article:

Abstract

The acidic functional groups content, pK value, DELTAH and DELTAS of humic acid (HA) and nitro-humic acid (NHA) were determined by potentiometry, conductometry and calorimetric titration. The thermodynamic parameters of carboxylic groups and phenolic hydroxyl groups of humic acid are similar to that of simple hydroxy-benzoic acid. The configuration sites of acidic functional groups in humic acid from different coals are different. The carbonyl groups on aromatic rings are probably ortho to phenolic -OH for HA and NHA extracted from Huangxian's brown coal and Japanese lignite, while those from Lingshi's weathered coal are not. The weak -COOH groups of the latter possess higher chemical activity. The -COOH content in HA increases, phenolic -OH group decreases and the chemical acidity of acidic functional groups increases when HA is oxidized by nitric acid. (14 refs.)
Publication Date:
Sep 01, 1983
Product Type:
Journal Article
Reference Number:
EDB-84-033429
Resource Relation:
Journal Name: Ranliao Huaxue Xuebao; (China); Journal Volume: 11:3
Subject:
01 COAL, LIGNITE, AND PEAT; CARBOXYLIC ACIDS; CHEMICAL PROPERTIES; COAL; SOLVENT EXTRACTION; HUMIC ACIDS; BROWN COAL; CALORIMETRY; CARBONYLS; HYDROXYL RADICALS; OXIDATION; POTENTIOMETRY; RADICALS; REACTIVITY; STRUCTURAL CHEMICAL ANALYSIS; TITRATION; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; ENERGY SOURCES; EXTRACTION; FOSSIL FUELS; FUELS; MATERIALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; SEPARATION PROCESSES; 010600* - Coal, Lignite, & Peat- Properties & Composition
OSTI ID:
5433916
Country of Origin:
China
Language:
Chinese
Other Identifying Numbers:
Journal ID: CODEN: RHXUD
Submitting Site:
HEDB
Size:
Pages: 32-40
Announcement Date:

Journal Article:

Citation Formats

Shanxiang, Li, Shuhe, Sun, and Zhai Zongxi, Wu Qihu. The acidic functional groups of humic acid. China: N. p., 1983. Web.
Shanxiang, Li, Shuhe, Sun, & Zhai Zongxi, Wu Qihu. The acidic functional groups of humic acid. China.
Shanxiang, Li, Shuhe, Sun, and Zhai Zongxi, Wu Qihu. 1983. "The acidic functional groups of humic acid." China.
@misc{etde_5433916,
title = {The acidic functional groups of humic acid}
author = {Shanxiang, Li, Shuhe, Sun, and Zhai Zongxi, Wu Qihu}
abstractNote = {The acidic functional groups content, pK value, DELTAH and DELTAS of humic acid (HA) and nitro-humic acid (NHA) were determined by potentiometry, conductometry and calorimetric titration. The thermodynamic parameters of carboxylic groups and phenolic hydroxyl groups of humic acid are similar to that of simple hydroxy-benzoic acid. The configuration sites of acidic functional groups in humic acid from different coals are different. The carbonyl groups on aromatic rings are probably ortho to phenolic -OH for HA and NHA extracted from Huangxian's brown coal and Japanese lignite, while those from Lingshi's weathered coal are not. The weak -COOH groups of the latter possess higher chemical activity. The -COOH content in HA increases, phenolic -OH group decreases and the chemical acidity of acidic functional groups increases when HA is oxidized by nitric acid. (14 refs.)}
journal = {Ranliao Huaxue Xuebao; (China)}
volume = {11:3}
journal type = {AC}
place = {China}
year = {1983}
month = {Sep}
}