Evaluation of in situ sulfate reduction as redox buffer capacity in groundwater flow path

Ioka, Seiichiro; Iwatsuki, Teruki; Amano, Yuki; Furue, Ryoji*

Nihon Suimon Kagakkai-Shi, 37(1), p.3 - 8, 2007/02

https://doi.org/10.4145/jahs.37.3

For safety assessment of geological isolation, it is important to evaluate in situ redox buffer capacity in high-permeability zone as groundwater flow path. This study evaluated in situ sulfate reduction rate as redox buffer capacity in the conglomerate bedding in Toki Lignite-bearing Formation, which occurs at the lowest part of sedimentary rocks overlying basement granite. The bedding plays an important role as the main groundwater flow path. The result showed that in situ redox buffer capacity in the conglomerate bedding has been identified on first nine months, whereas in the following period the redox buffer capacity has not been identified for about fifteen months. This will be caused by the bedding became inappropriate for microbial survival as the organic matter which is needful for microbial activity was consumed. Thus, there will be limited redox buffer capacity in groundwater flow path even in formation including organic matter-bearing layer.

Hydrochemical baseline condition of groundwater at the Mizunami underground research laboratory (MIU)

Iwatsuki, Teruki; Furue, Ryoji; Mie, Hideki; Ioka, Seiichiro; Mizuno, Takashi

Applied Geochemistry, 20(12), p.2283 - 2302, 2005/12

https://doi.org/10.1016/j.apgeochem.2005.09.002

Hydrochemical conditions up to 1000m below ground level around the Mizunami Underground Research Laboratory were investigated to construct a baseline condition model descriving the undisturbed condition.

Hydrochemical investigation of groundwater in DH-15 borehole

Mie, Hideki; Iwatsuki, Teruki; Furue, Ryoji; Mizuno, Takashi; Ioka, Seiichiro

JNC TN7400 2004-006, 64 Pages, 2004/10

JNC-TN7400-2004-006.pdf:9.26MB
JNC-TN7400-2004-006(errata).pdf:0.08MB

This report describes the results of the investigation on the hydrochemical characteristic of groundwater in DH-15 borehole.

Data Book on Groundwater Chemistry in the Tono Area

Furue, Ryoji; Iwatsuki, Teruki; Mizuno, Takashi; Hideki, Mie

JNC TN7450 2003-001, 103 Pages, 2003/08

JNC-TN7450-2003-001.pdf:4.63MB

This data book is the revised edition of the previous data book, made by Iwatsuki et al. (2001). Chemical data of groundwaters from 5 boreholes (MIU-4, DH-2, DH-3, MSB-2 and MSB-4) and those for onsen (spa) (Mikai and Hayakawa, 1970) are added to the previous edition. This data book presents the chemical data for groundwaters, surface waters and rain waters in the Tono area, obtained up to the beginning of April 2003. Compositions for about 350 waters are tabulated. These data were acquired over a period of more than 15 years, during many different studies that had various purposes. The data were obtained through the uranium exploration, the hydrochemical investigation within and around the Tono Mine, the regional hydrogeological study and the hydrochemical investigations within the Shobasama site and the MIU (Mizunami Underground Research Laboratory) construction site. While considerable effort has been expended to transcribe data correctly from the various sources, a care must be taken to read the data because of uneven quality in the data due to different methods of sampling and analyzing. Therefore report indicates the data sources, the geographical locations where the data were obtained and the main sampling and analytical methods respectively in order to reconfirm the suitability of the data for each appraisal purpose.

多区間水質連続モニタリング装置

岩月 輝希; 古江 良治

小川 賢*

JP, 2005-033027  Patent licensing information  Patent publication (In Japanese)

【課題】ボーリング孔内に設定した複数の地下水採水区間を対象として、溶存ガスの脱ガスを抑制しながら地下水を採水し物理化学的状態の測定を連続的に行う。 【解決手段】筒状ケーシング20に複数の遮水用パッカー22を間隔をおいて配設すると共に遮水用パッカーで仕切られる各採水区間と連通する採水配管26を組み込んだ孔内多区間採水部12をボーリング孔10内に挿入する。各採水配管に坑道配管切替部14を接続し、坑道配管切替部によって任意の一つの採水区間の地下水を物理化学的状態測定部16に導く。物理化学的状態測定部に組み込んだ定圧制御弁によって地下水中の溶存ガスの脱ガスを抑制しながらPHや酸化還元電位などを連続測定する。