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伊万里湾堆積物中の脂質成分の分布


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Title: 伊万里湾堆積物中の脂質成分の分布
Other Titles: Distribution of Lipid Compounds in Sediments from Imari Bay
Authors: 近藤, 寛 / 石渡, 良志 / 山本, 修一
Authors (alternative): Kondo, Hiroshi / Ishiwatari, Ryoshi / Yamamoto, Shuichi
Issue Date: 29-Feb-1992
Publisher: 長崎大学教育学部
Citation: 長崎大学教育学部自然科学研究報告. vol.46, p.23-42; 1992
Abstract: Imari Bay lies in the north-western part of Kyushu with the Takasima Is. at the bay-mouth and the Fukushima Is, in the cetral bay, copening north-westward into Genkainada open sea. The bottom sediments were divided into four groups, that is , calcareous muddy sand, calcareous mud, mud, muddy sand, by the contents of mud and calcium carbonate. Eight sediment samples have been analysed for aliphatic hydrocarbons (n-alkanes), aliphatic alcohols (n-alcohols), 4-methyl-sterols and 4-desmethyl-sterols in term of their area distribution, and in relation to the types of sediments. Distribution of n-alkanes having a high odd/even carbon number preference with a maximum at n-C29 or n-C31 show a predomkinant contribution of terrestrial higher plants. L/H values (L≦n-C20,H≧n-C21) of n-alkanes for the calcareous sediments from the strait and the bay-mouth area are relatively high (L/H=0.13 at St. 3, 5). Low L/H value for the muddy sand from the bay head (L/H=0.10 at st. 8) due to an influx of terrigenous higher plants which contain high concentrations of ≧n-C21from the Arita and Imari rivers. n-Alcohols ranging from n-C14 to n-C28 show even carbon number predominance and a maximum at n-C22 or n-C24. These ≧n-C22 alcohols were derived from the higher plants of terrestrial source. In the lower molecular weright range (<n-C22), n-C16 alcohol is major peak for the samples at St. 1, 2, 5. A total of 7 different 4-methyl-sterols were identified and they comprise 7-19% of the total 4-methyl-sterols. In general, high amounts of dinosterol were found in muddy sediments around the Fukushima Is. is the central bay. Eighteen 4-desmethyl-sterols were identified in concentrations up to 37.3 μg/g dry sediment. The predominant components are 22-dehydrocholesterol, cholesterol, cholestanol, brassicasterol, β-Sitosterol is major 4-desmethyl-sterols at the St. 8 in the bay-head area, in concentrations up to 30.9% of the total sterols, which has been used as an indication of terrestrial input. Cholesterol is the predominant 4-desmethyl-sterol in the calcareous sediments from strait and the bay-mouth area.
URI: http://hdl.handle.net/10069/32296
ISSN: 0386443X
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No. 46

Citable URI : http://hdl.handle.net/10069/32296

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