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シリカコロイドによるOHラジカル捕捉の時間分解測定

Scavenging reaction of colloidal silica toward OH radical measured by pulse-radiolysis technique

熊谷 友多; 永石 隆二; 山田 禮司; 室屋 裕佐*; 勝村 庸介*

Kumagai, Yuta; Nagaishi, Ryuji; Yamada, Reiji; Muroya, Yusa*; Katsumura, Yosuke*

シリカコロイドを含む水溶液中での、水の放射線分解によるラジカル生成物の反応を、パルスラジオリシス法を用いて時間分解で調べた。その結果、シリカコロイドは他の捕捉剤と競争的にOHラジカルを捕捉することを観測した。さらに、粒径の異なる試料を用いて捕捉能の測定を行い比較したところ、粒径の小さなものほど、単位添加量あたりの捕捉能が高い傾向にあることがわかった。

Reactions of radical products of water radiolysis in the presence of colloidal silica were studied by time-resolved optical absorption measurement using pulse-radiolysis technique. Consequently scavenging reaction of colloidal silica toward OH radical was observed. Then scavenging capacities of colloidal silica samples of different sizes were measured. The results showed that colloidal silica of smaller size has larger scavenging capacity for unit amount added to solutions.

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