Distinction of marine and terrestrial origin of humic acids in North Sea surface sediments by absorption spectroscopy

Distinction of marine and terrestrial origin of humic acids in North Sea surface sediments by absorption spectroscopy

A suite of humic acid isolates from terrestrial and marine soils and sediments have been analysed by UV/visible spectroscopy. Marine samples are characterised by a maximum at 407 nm which is lacking in terrestrial ones. The absorbance ratio of 270/407 nm (A2 /A4) can be used to differentiate humic a...

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Veröffentlicht in:Marine geology 2000-03, Vol.164 (3-4), p.173-181
Hauptverfasser: Fooken, U, Liebezeit, G
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Marine
North Sea
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Liebezeit, G
description A suite of humic acid isolates from terrestrial and marine soils and sediments have been analysed by UV/visible spectroscopy. Marine samples are characterised by a maximum at 407 nm which is lacking in terrestrial ones. The absorbance ratio of 270/407 nm (A2 /A4) can be used to differentiate humic acid sources as is demonstrated for North Sea surface sediments. Here, the southern coastal samples had high A2/A4 ratios indicating higher terrestrial contributions to the humic acid pool. In contrast, samples from the northern North Sea had low A2/A4 ratios suggesting higher marine contributions. Analysis of core samples and an Eocene oil shale indicates that the A2/A4 ratio is unaffected by early diagenetic processes.
doi_str_mv 10.1016/S0025-3227(99)00133-4
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North Sea
title Distinction of marine and terrestrial origin of humic acids in North Sea surface sediments by absorption spectroscopy
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