Carbon Isotope Composition and Its Variation of Particulate Organic Matter in River Waters from the Kuzuryu River System

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  • NAGAO Seiya
    Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University
  • KANAMORI Masaki
    Graduate School of Natural Science and Technology, Kanazawa University
  • OCHIAI Shinya
    Low Level Radioactivity Laboratory, Institute of Nature and Environmental Technology, Kanazawa University

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Other Title
  • 九頭竜川水系河川水における懸濁態有機物の炭素同位体組成とその変動要因
  • クズリュウガワ スイケイ カセンスイ ニ オケル ケンダクタイ ユウキブツ ノ タンソ ドウイ タイソセイ ト ソノ ヘンドウ ヨウイン

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Abstract

<p>Radioactive and stable carbon isotopes (14C and 13C) can serve as powerful tools for studying the dynamics of organic matter in aquatic systems. This study considered the transport of particulate organic matter in a river system, a main river and its tributary with different watershed conditions, using carbon isotopic signatures. The Kuzuryu River system is located at Fukui and Gifu Prefecture in the central part of Japan, and consists of a main river, Kuzuryu River, and its main tributary, the Hino River. River research was conducted at a fixed station in the lower reaches of both rivers during June to October in 2010. Suspended solid samples were collected from 85 L to 141 L of river water using a continuous-flow centrifugation. δ13C of organic matter in riverine suspended solids had –26.3‰ to –24.0‰ for the Kuzuryu River and –27.0‰ to –26.1‰ for the Hino River. The Δ14C values of the Kuzuryu and Hino samples were –168‰ to –87‰ and –209‰ to –143‰, respectively. The Δ14C values of Hino River were depleted in 14C rather than the Kuzuryu River. However, the carbon isotopes have correlations with the water level for both rivers. The differences in the particulate organic matter characteristics are explained by the distribution of paddy fields and forests in each watershed, and the differences in the supply of suspended solids from their watershed due to rainfall.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 69 (12), 707-714, 2020-12-05

    The Japan Society for Analytical Chemistry

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