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- W1556830222 abstract "The objective of this study was to evaluate the effects of dissolved gas types on the reactivity of iron f3r the reduction of chromium(VI). The reactivity and longevity of iron f3r the reduction of Cr(VI) was tested under different gas atmosphere. Under purging with nitrogen gas, about 99% Cr(VI) was reduced within 4 hours. After four repeated injections of Cr(VI), iron reactivity was significantly decreased. These results indicated that oxidized iron (Fe(III)) and reduced chromium (Cr(III)) were deposited onto zero valent iron surface, resulting In the inhibition of further reduction of Cr(VI). Removal of deposited oxides from zero valent iron by acid washing re-activated the iron surface. Iron exposed to pure oxygen or carbon dioxide showed very low reactivity. It is concluded that oxidized iron by dissolved oxygen and carbonate salts deposited on the metal surface deactivated the iron surface. Increased solution pH and high concentration of oxidized iron species implied that the decreased reduction rate of Cr(VI) was mainly due to the metal hydroxide formed onto iron surface." @default.
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- W1556830222 date "2005-01-01" @default.
- W1556830222 modified "2023-09-27" @default.
- W1556830222 title "Effects of Dissolved Gas Types and Solution Chemistry on the Reaction Rates of Chromium(VI) reduction by Zero Valent Iron" @default.
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