巻号一覧
32 巻 (1998)
- 4 号 p. 149-
- 3 号 p. 107-
- 2 号 p. 45-
- 1 号 p. 1-
32 巻, 2 号
選択された号の論文の5件中1～5を表示しています
- |<
- <
- 1
- >
- >|
企画総説「地球化学の新方法」
-
鍵 裕之, 奈良 雅之1998 年 32 巻 2 号 p. 45-69
発行日: 1998/05/20
公開日: 2016/12/24
ジャーナル フリーVibrational spectroscopy is a conventional spectroscopy in the field of chemistry, physics and even in geosciences for the purpose of elucidating physicochemical state of molecules, crystals and glasses. The recent drastic progress in optical devices and computing technology enables us to perform a quick analysis with a high sensitivity and also downsizes equipments. The development of IR and Raman spectroscopy in micro region is also attributable to these technical improvements. In this paper, we summarize experimental techniques of IR and Raman spectroscopy from a geochemical standpoint, starting with a fundamental principle of vibrational spectroscopy. Then, the recent researches relating to (micro) IR/Raman spectroscopy are reviewed. Furthermore, complemental utilizations of other spectroscopy like NMR and XAFS are also mentioned.抄録全体を表示PDF形式でダウンロード (2626K)
報文
-
金井 豊, 井内 美郎, 山室 真澄, 徳岡 隆夫1998 年 32 巻 2 号 p. 71-85
発行日: 1998/05/20
公開日: 2016/12/24
ジャーナル フリーIn order to study sedimentation environments and sedimentation rates in Lake Shinji, Shimane Prefecture, the Pb-210 and Cs-137 radioactivities were measured in 15 cores taken on Oct. in 1994. The sedimentation rates in the lake varied at each location; those in the western area are about 0.25g/cm2/y, larger than in the eastern area (about 0.1g/cm2/y), and those in the central area are the lowest (≦0.05g/cm2/y). This fact indicates that most of the sediments supplied by the Hii river deposited in the western area and little amount was transported to the central area. The inventries of radionuclides that indicate the amount of accumulation were larger in the western area, which is the same tendency as the sedimentation rate. They are in a positive correlation (correlation coefficient (R) is 0.78), and their relationships are different from that observed in offshore sediments of Japan sea. The fluxes of excess Pb-210 and Cs-137 are large in western area, which suggests that much amount of sediment were supplied from the Hii river. The concentrations of excess Pb-210 and Cs-137 in surface sediments are in a good correlation (R=0.76), which indicates that both nuclides in sediment grains may exist in a constant ratio. The sources of radionuclides are supposed to be terrestial fallout and suspended particles carried from river. Although the latter source is not negligible, it is considered that the former is superior and that radionuclides moved and distributed heterogeneously in Lake Shinji.抄録全体を表示PDF形式でダウンロード (1280K) -
渡邊 剛, 大場 忠道1998 年 32 巻 2 号 p. 87-95
発行日: 1998/05/20
公開日: 2016/12/24
ジャーナル フリーA modern Tridacna (Hippopus hippopus) was collected on September 5,1993 from a coral reef at Ishigaki Island in Ryukyu Archipelago, Japan, in order to investigate the environmental changes recorded in the shell. We adopted freezing microtome technique for high resolution analysis of the oxygen isotope of the shell. A portion of the inner layer, where daily growth lines are observed under a microscope, was cut out vertically from the inner surface. A stick measuring 20x1x2mm was then placed in water and frozen. Using a microtome, 50um interval samples were pealed off the stick in a room maintained at -20℃. We determined the date of the formation of each sample by measuring the distance from the inner surface of the shell and by counting the daily growth lines. The water temperatures estimated from the oxygen isotopic values at 1-2 day intervals agreed very well (correlation coefficient: 0.90) with the observed water temperatures which have a seasonal temperature range between about 20℃ and 32℃. This implies that the Tridacna precipitates its shell in isotopic equilibrium with the surrounding sea water and that the oxygen isotope values are mainly determined by the water temperature.抄録全体を表示PDF形式でダウンロード (968K) -
森永 茂生, 石渡 良志1998 年 32 巻 2 号 p. 97-104
発行日: 1998/05/20
公開日: 2016/12/24
ジャーナル フリーAs a part of study to elucidate the source of aromatic structure in sedimentary humic substances (SHS), we synthesized melanoidins (a model SHS) from 13C-labeled glucose and nonlabeled amino acids and examined how glucose and amino acids are involved in the formation of their aromatic structures. The synthesized melanoidin was oxidized by alkaline perman ganate and benzenecarboxylic acids in their degradation products were analyzed by Chemical Ionization-GC/MS. The results indicate that aromatic structures are formed in melanoidin as a result of both selfcondensation of glucose and a reaction between glucose and amino acids.抄録全体を表示PDF形式でダウンロード (759K)
博士論文抄録
-
北村 守次1998 年 32 巻 2 号 p. 105-
発行日: 1998/05/20
公開日: 2016/12/24
ジャーナル フリーPDF形式でダウンロード (198K)
- |<
- <
- 1
- >
- >|