Carbon isotopic difference of saturated long-chain n-fatty acids between a terrestrial and a marine sediment

Hiroshi Naraoka, Keita Yamada, Ryoshi Ishiwatari

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Stable carbon isotopic compositions of individual n-fatty acids ranging from C20 to C30 in a terrestrial (riverine) and a marine (pelagic) sediment were determined using gas chromatography/isotope ratio monitoring mass spectrometry (GC/IRMS). These fatty acids in a terrestrial sediment at the Ohtsuchi river in northern Honshu Island, Japan, showed δ13C values (from -35 to -32%o relative to PDB) lighter than that of the total organic carbon (TOC; -26,4‰) by about 6 to 9‰, The δl3C values from a marine sediment in the Pacific Ocean ca. 500 km off the coast of Honshu Island varied from -31 to -26‰, which were also lighter than that of the TOC (-20.5‰) by 6 to 9‰. The δ13C values of n-fatty acids ranging from C20to C30 in the marine sediment were heavier by about 5 to 6‰ than those at the corresponding carbon numbers in the terrestrial one. Isotopically, the marine n-fatty acids were clearly distinguished from the terrestrial ones. These results suggest that long-chain n-fatty acids in marine sediment were not derived from land higher plant but from marine organisms, although long-chain n-fatty acids (≥C20) in marine sediments have often been used to assess terrestrial material contribution to the ocean.

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalGEOCHEMICAL JOURNAL
Volume29
Issue number3
DOIs
Publication statusPublished - Jan 1 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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