Preliminary Study on the Lipid Compounds in the Core Sediments from the Regulating Pond of Isahaya bay changing from Sea water to Fresh water
Hiroshi KONDO, Naoko HIROSE and Kazunari HIGUCHI
Department of Geology, Faculty of Education, Nagasaki University Bunkyo-machi, Nagasaki, 852-8521 Japan
(Received Mar.15)
Abstract
Lipid compounds of core sediments from the regulating pond that was changed from seawater to fresh water for the reclamation of the Isahaya Bay were exam- ined. The thickness of a clayed sediments in the regulating pond was more than 30cm from April,1997 to October,1999. The core sediments that was dredged on July,1999 were clay. The upper part,0-22cm of the core was a sediment of the pond and the lower part of the core was marine sediment.
Core sediments contain n-alkanes >C27 and n-alcohols >C22 which indicative of an origin from higher plants. The sediments of the pond contain small amounts of Cn-alkane and Cwalcohol that are typical of autochthonous production.
Sterols of 16 kinds were detected. In the upper part of the core, the amount of C26 -sterols, 22-dehydrocholesterol and cholesterol decreases with increasing stigmasterol and ,B -sitosterol concentration. In the triangular diagram of C27, C28 and C29 sterols in the core sediments, the upper of the core were plotted in estuarine of bay and the lower part were plotted in open marine.
The large amounts of n-alcohols, phytol, sterols, fatty acids and coprostanol found in the upper part of the core may be interpreted as indicating the eutrophication and the pollution in the sediments.
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Cranwell P.A.(982): Lipids of aquatic sediments and sedimenting particulates. Prog.Lipid Res., 21, 271-308.
Huang W.Y. and Meinschein W.G.(979): Sterols as ecological indicators. Geochim. Cosmochim.
Acta, 43, 739-745 .
• IB~~•i!§fmJ$- •*~~~r (978) :ft~~~.fl!~0)~~ilU.4o/J0)5m~~ii (1m~ttt;fi4o/J0)5m~~ii- of0)1 ) ft~*~~El~6Jf$ll, 29. 81-90.
jl(Hi ~. ~~m;r • tiVlJ3!i'5 (993) :JIIJJj{*ttRO)~*{tctt:l*ttt;fi4o/J¢O)ijljiiJJJt51 ft~*~~El~6Jf$ll,
49, 13-25.
jl(Hi ~. #jB-b(itr •m~fD~•tiVlJ3!i'5 (995) :ii~*l\JittR. ~{w}JIJFYT~'AO)Mttt.\ijit;fi4o/J I:. t> Ij~ijlj iiJJJt51 ft~*~~13~6Jf$ll, 53. 41-55.
ft~ifIllH$Ilm$ (2000) :!tl!~. ftdmj - fJil~ro~i1 ~~;t ~- 1-182, ftdmjiflllH.
INJ?-fDr (983) :*J?:~I:.t>lj ~ L*~~O)flj~c L"'CO):J'/0A~J - JvO)*iJJ 0969$-1972$) !tl!
~{t'¥:, 17, 68-75.
{6:HilE1Jl!·"* ~~• {6:Hiut-·1JDKiJl~· rpJl\fID(5L (2001) :~.fl!~. ~Bj]1mC'{iiJ;6it>C. -:>"'C~) ~0);6>?
M'¥:, 71. 7, 882-894.
Tulloch A.P.(976):Chemistry of waxes of higher plants. In Chemistry and Bioche-mistry of Natu- ral Waxes, 394-418, Elsevier, Amsterdam.
Lt-t
C· m*'il- • tiVlJ3!i'5 (992) :*F1t.\ijtt:l*it;fi4o/J¢O)ij~iiJJJt51 Res.Org.Geochem., 8, 79-81.Volkman J.K.(986):A review of sterol markers for marine and terrigenous organic matter. Org.
Geochem.•9, 83-99.
Weete J.D.(976):Algae and fungal waxes. In Chemistry and Biochemistry ofNatural Waxes, 349- 418, Elsevier, Amsterdam.
