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RADIOCARBON DATING OF PALEOSOLS USING SOIL ORGANIC MATTER COMPONENTS
Author(s) -
GOH K. M.,
MOLLOY B. P. J.
Publication year - 1978
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1978.tb00805.x
Subject(s) - humin , radiocarbon dating , charcoal , paleosol , organic matter , humic acid , soil water , acid hydrolysis , chemistry , environmental chemistry , hydrolysis , total organic carbon , soil organic matter , geology , mineralogy , soil science , organic chemistry , paleontology , fertilizer , loess
Summary Soil organic matter components of classical humic acid and humic fractions were extracted from two paleosols using 0.1 M Na 4 P 3 O 2 :0.1 M NaOH. These fractions were subjected to chemical treatment with 6 M HC1 or 70 per cent HNO, before radiocarbon assay, and their radiocarbon dates were compared with those of similar but untreated fractions, untreated buried soils, and previously published charcoal dates. Hydrolysis of humic acid and humin fractions with mineral acids, particularly 70 per cent HNO 3 led to older radiocarbon dates, comparable to, though slightly older than, those of charcoal derived from the same buried layers. In contrast, the dates of soils and their humic acid and humin fractions before acid hydrolysis were younger and therefore less reliable. The application of this procedure to studies of paleosols in New Zealand is discussed.