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堆積岩中の酢酸形$$^{14}$$Cの分配挙動; 硝酸塩添加時の微生物影響

Partition behavior of acetic $$^{14}$$C in sedimentary rock; Effect of microbial activities in the presence of nitrate

知場 一訓*; 横地 琢哉*; 小崎 完*; 佐藤 正知*; 宮内 善浩*; 香西 直文   ; 大貫 敏彦

Chiba, Takanori*; Yokochi, Takuya*; Kozaki, Tamotsu*; Sato, Seichi*; Miyauchi, Yoshihiro*; Kozai, Naofumi; Onuki, Toshihiko

嫌気性雰囲気下での酢酸形$$^{14}$$Cの堆積岩への分配挙動を調べた。溶液に硝酸塩を加えた場合、微生物の硝酸塩呼吸に起因する硝酸濃度の減少と酢酸形$$^{14}$$Cの分解により生成した$$^{14}$$Cの気相への移行量の増加との相関が明らかになった。以上の結果は、$$^{14}$$Cの気相への移行が軽石凝灰岩中の微生物の硝酸塩呼吸に起因していることを示唆している。

Partitioning behavior of acetic $$^{14}$$C in sedimentary rock has been studied in anaerobic atomosphere condition. Addition of nitrate salt in the solution showed good correlation between increase of oncentration of $$^{14}$$C in air and decrease of concentration of nitate salts. These results suggest that respiration of nitrifying bacteria result in the transformation of $$^{14}$$C.

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