有明海北部沿岸の干潟堆積物に含まれる有機物

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Sediment samples from 15 stations of the tidal flat along the northern coast of Ariake Bay were analyzed for mud content, water content and organic matter. Loss of organic matter upon ignition was also analyzed. Elementary composition and absorption spectra of humic acids from 8 samples were determined. The sediments in the tidal flat off Kashima have more mud content, water content and loss on ignition (550℃,1h.) than is found in the sediments from the tidal flat of the Chikugo delta. The contents of mud and water are 95.37-99.88% and 61.8-79.9% respectively. The loss on ignition at 550℃ for 1 hour ranges from 7.47% to 13.50% and the mean value is 11.67%. The average ratio of loss on ignition/organic carbon is 5.29. The average content of organic carbon, total hydrogen and total nitrogen in the samples is 2.21, 0.90, 0.255% respectively. The C/N ratio varies between 7.31 and 10. 18. Samples from the tidal flat off Kashima have a slightly higher nitrogen content, lower organic carbon and therefore a lower C/N ratio. The humic acids vary between 0.64% and 0.99% in the 8 samples, and average 0.75%. There is a good correlation between humic acid content and organic carbon content. Determination of elementary composition in the humic acids showed the following averages : carbon, 53.82% ; hydrogen, 6.07% ; and nitrogen, 5.69%. The nitrogen content of humic acids in the tidal flat sediments of Ariake Bay are higher than in other lake and marine sediments. The humic acid has a weak absorption band near 405mμ.
長崎大学教育学部の論文

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近藤寛
長崎大学教育学部

有明海北部沿岸の干潟堆積物に含まれる有機物

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