Alkaline degradation of peat humic acids

Part II. Indentification of hydrophilic products

Kari Hänninen, Klaus Niemelä

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Peat humic acids have been treated at 185°C with 2 M sodium hydroxide solution, both in the presence and in the absence of sodium sulfide. About 6.3% of the material was converted into aliphatic low-molecular—weight carboxylic acids, which were analyzed by capillary gas-liquid chromatography — mass spectrometry. In all, nearly 60 carboxylic acids were identified, of which glycolic, lactic, 2-hydroxy-2—methylpropanoic, oxalic, malic and 3,4-dide0xyhexaric acids were the main constituents. Minor products included a wide variety of saccharinic acids and related compounds. The nature of the reaction products suggests that they are derived, to large extent, via a peeling-type reaction from carbohydrates or carbohydrate-related structural units of the starting material. The presence of carbohydrate structures as integral parts of peat humic acids is discussed.
Original languageEnglish
Pages (from-to)459-463
JournalActa Chemica Scandinavica
Volume46
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

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Humic Substances
Soil
Carbohydrates
Carboxylic Acids
Sodium Hydroxide
Acids
Gas Chromatography-Mass Spectrometry
Milk

Cite this

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title = "Alkaline degradation of peat humic acids: Part II. Indentification of hydrophilic products",
abstract = "Peat humic acids have been treated at 185°C with 2 M sodium hydroxide solution, both in the presence and in the absence of sodium sulfide. About 6.3{\%} of the material was converted into aliphatic low-molecular—weight carboxylic acids, which were analyzed by capillary gas-liquid chromatography — mass spectrometry. In all, nearly 60 carboxylic acids were identified, of which glycolic, lactic, 2-hydroxy-2—methylpropanoic, oxalic, malic and 3,4-dide0xyhexaric acids were the main constituents. Minor products included a wide variety of saccharinic acids and related compounds. The nature of the reaction products suggests that they are derived, to large extent, via a peeling-type reaction from carbohydrates or carbohydrate-related structural units of the starting material. The presence of carbohydrate structures as integral parts of peat humic acids is discussed.",
author = "Kari H{\"a}nninen and Klaus Niemel{\"a}",
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Alkaline degradation of peat humic acids : Part II. Indentification of hydrophilic products. / Hänninen, Kari; Niemelä, Klaus.

In: Acta Chemica Scandinavica, Vol. 46, 1992, p. 459-463.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Alkaline degradation of peat humic acids

T2 - Part II. Indentification of hydrophilic products

AU - Hänninen, Kari

AU - Niemelä, Klaus

PY - 1992

Y1 - 1992

N2 - Peat humic acids have been treated at 185°C with 2 M sodium hydroxide solution, both in the presence and in the absence of sodium sulfide. About 6.3% of the material was converted into aliphatic low-molecular—weight carboxylic acids, which were analyzed by capillary gas-liquid chromatography — mass spectrometry. In all, nearly 60 carboxylic acids were identified, of which glycolic, lactic, 2-hydroxy-2—methylpropanoic, oxalic, malic and 3,4-dide0xyhexaric acids were the main constituents. Minor products included a wide variety of saccharinic acids and related compounds. The nature of the reaction products suggests that they are derived, to large extent, via a peeling-type reaction from carbohydrates or carbohydrate-related structural units of the starting material. The presence of carbohydrate structures as integral parts of peat humic acids is discussed.

AB - Peat humic acids have been treated at 185°C with 2 M sodium hydroxide solution, both in the presence and in the absence of sodium sulfide. About 6.3% of the material was converted into aliphatic low-molecular—weight carboxylic acids, which were analyzed by capillary gas-liquid chromatography — mass spectrometry. In all, nearly 60 carboxylic acids were identified, of which glycolic, lactic, 2-hydroxy-2—methylpropanoic, oxalic, malic and 3,4-dide0xyhexaric acids were the main constituents. Minor products included a wide variety of saccharinic acids and related compounds. The nature of the reaction products suggests that they are derived, to large extent, via a peeling-type reaction from carbohydrates or carbohydrate-related structural units of the starting material. The presence of carbohydrate structures as integral parts of peat humic acids is discussed.

U2 - 10.3891/acta.chem.scand.46-0459

DO - 10.3891/acta.chem.scand.46-0459

M3 - Article

VL - 46

SP - 459

EP - 463

JO - Acta Chemica Scandinavica

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SN - 0904-213X

ER -