2024-03-29T13:57:00Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00007602
2023-01-16T05:11:56Z
367:368:369:935
Chemistry of organic-rich sediment and porewater from the port of Yasugi, Lake Nakaumi
中海安来港内の有機物に富む堆積物(ヘドロ)とその間隙水の化学組成
武邊, 勝道
21429
TAKEBE, Masamichi
21430
大屋, 誠
21431
OHYA, Makoto
21432
三村, 耕一
21433
MIMURA, Koichi
21434
杉谷, 健一郎
21435
SUGITANI, Kenichiro
21436
山本, 鋼志
21437
YAMAMOTO, Koshi
21438
亀谷, 均
21439
KAMETANI, Hitoshi
21440
高田, 龍一
21441
TAKATA, Ryuichi
21442
吉田, 英一
21443
YOSHIDA, Hidekazu
21444
2006-12-25
Lake Nakaumi, San-in area, is one of the largest blackish lake in Japan. Recently, sedimentation of organic flock named “Hedoro” becomes a serious problem, because the enrichment of organic flock may damage the ecological system. In order to reveal geochemical behavior of elements in the organic-rich sediment of the brackish lake during early diagenesis, the chemistry of upper 60 cm sediment and porewater from the harbor of Yasugi located on southeastern part of Lake Nakaumi was examined. Total organic carbon (C_org) and total nitrogen (N) concentrations of the sediment are 3.0 to 5.5% and 0.3 to 0.6%, respectively. C_org/N mole ratios in the sediment ranges from 10 to 13 suggesting that organic matter in the sediment originate mainly from phytoplanktons. The C_org and N concentrations decrease with depth, suggesting organic degradation during diagenesis. The porewater shows low Eh and decreasing of SO_4 ^2- concentration with depth. Hence the degradation of organic matter is accompanied by sulfate reduction. Whereas, relation between Eh and pH in the porewater show that HS^- concentration is less than SO_4^2- concentration. Considering the high sulfur concentration up to 4% in sediment, HS^- generated by the sulfate reduction is probably removed by the deposition of sulfide.
departmental bulletin paper
名古屋大学博物館
2006-12-25
名古屋大学博物館報告
22
19
29
http://hdl.handle.net/2237/9305
13468286
jpn