Variations in Δ14C of humic substances in the Lake Biwa waters
- 1. Faculty of Environmental Earth Science, Hokkaido University, Sapporo 060-0810 (Japan)
- 2. Kyoto Prefectural University, Kyoto 606-8522 (Japan)
- 3. National Institute of Environmental Studies, Tsukuba 305-8567 (Japan)
- 4. Faculty of Agriculture, Kobe University, Kobe 657-8501 (Japan)
Description
Carbon isotopes (13C and 14C) were used to study the characteristics and origin of humic substances in water samples from Lake Biwa in Japan. Humic substances were isolated from surface lake waters in each season by the XAD extraction method and their carbon isotopic ratios were measured by accelerator mass spectrometry. The Δ14C values of Biwa humic and fulvic acids indicate that these substances consist mainly of pre-bomb 14C. There is a negative correlation between Δ14C and δ 13C values for the Biwa fulvic acids. The fulvic acid consists of younger organic materials with lower δ 13C value in January, but older organics with higher δ 13C in April and October. The major part of fulvic acid may be supplied from soil solution and/or groundwater in the watershed and their contribution varies with season
Additional details
Identifiers
- DOI
- 10.1016/j.nimb.2007.01.199;
- PII
- S0168-583X(07)00298-4;
Publishing Information
- Journal Title
- Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms
- Journal Volume
- 259
- Journal Issue
- 1
- Journal Page Range
- p. 552-557
- ISSN
- 0168-583X
- CODEN
- NIMBEU
Conference
- Title
- 10. international conference on accelerator mass spectrometry
- Dates
- 5-10 Sep 2005
- Place
- Berkeley, CA (United States)
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 39022614
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- BOMBS; CARBON; CARBON 13; CARBON 14; EXTRACTION; FULVIC ACIDS; GROUND WATER; ISOTOPE RATIO; JAPAN; LAKES; MASS SPECTROSCOPY; ORGANIC MATTER; SEASONS; SOLUTIONS
- Descriptors DEC
- ASIA; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CARBON ISOTOPES; DEVELOPED COUNTRIES; DIMENSIONLESS NUMBERS; DISPERSIONS; ELEMENTS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HOMOGENEOUS MIXTURES; HYDROGEN COMPOUNDS; ISOTOPES; LIGHT NUCLEI; MATTER; MIXTURES; NONMETALS; NUCLEI; ORGANIC ACIDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; RADIOISOTOPES; SEPARATION PROCESSES; SPECTROSCOPY; STABLE ISOTOPES; SURFACE WATERS; WATER; WEAPONS; YEARS LIVING RADIOISOTOPES
Optional Information
- Copyright
- Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.