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RISS 인기검색어
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- 저자 : R. P. Buck (검색결과 2 건)
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Immobilization of 99-Technetium (VII) by Fe(II)-Goethite and Limited Reoxidation
Um, Wooyong,Chang, Hyun-Shik,Icenhower, Jonathan P.,Lukens, Wayne W.,Serne, R. Jeffrey,Qafoku, Nikolla P.,Westsik, Joseph H.,Buck, Edgar C.,Smith, Steven C. American Chemical Society 2011 Environmental science & technology Vol.45 No.11
<P>During the nuclear waste vitrification process volatilized <SUP>99</SUP>Tc will be trapped by melter off-gas scrubbers and then washed out into caustic solutions, and plans are currently being contemplated for the disposal of such secondary waste. Solutions containing pertechnetate [<SUP>99</SUP>Tc(VII)O<SUB>4</SUB><SUP>–</SUP>] were mixed with precipitating goethite and dissolved Fe(II) to determine if an iron (oxy)hydroxide-based waste form can reduce Tc(VII) and isolate Tc(IV) from oxygen. The results of these experiments demonstrate that Fe(II) with goethite efficiently catalyzes the reduction of technetium in deionized water and complex solutions that mimic the chemical composition of caustic waste scrubber media. Identification of the phases, goethite + magnetite, was performed using XRD, SEM and TEM methods. Analyses of the Tc-bearing solid products by XAFS indicate that all of the Tc(VII) was reduced to Tc(IV) and that the latter is incorporated into goethite or magnetite as octahedral Tc(IV). Batch dissolution experiments, conducted under ambient oxidizing conditions for more than 180 days, demonstrated a very limited release of Tc to solution (2–7 μg Tc/g solid). Incorporation of Tc(IV) into the goethite lattice thus provides significant advantages for limiting reoxidation and curtailing release of Tc disposed in nuclear waste repositories.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2011/esthag.2011.45.issue-11/es104343p/production/images/medium/es-2010-04343p_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es104343p'>ACS Electronic Supporting Info</A></P>
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인권식,이중화,Gwon-Shik Ihn,Jung-hwa Lee,R. P. Buck 대한화학회 1983 대한화학회지 Vol.27 No.2
Tungstate 이온 감응에 대하여 세가지 성분인 $Ag_2S-PbS-PbWO_4$로된 전극이 제조되어 평가 되었다. 성분비(w/w%)가 51.71 : 16.64 : 31.65인 전극이 전위차 감응, 안정도, 감응속도, 감응속도, 재현성이 우수 하였다. $0.1F-NH_4Ac-NH_4OH$ 완충용액 속에서 일정한 이온강도와 pH 8.00로 조정된 $10^{-1}~10^{-4}M WO_4^{2-}$ 농도범위에서 실험하였고 감응성은 phosphate 감응 전극과 비슷하였다. 많은 이온들이 방해를 하였다. Three component $Ag_2S-PbS-PbWO_4$ electrodes have been prepared and evaluated for sensitivity to tungstate. The 51.71 : 16.64 : 31.65(w/w%) composition is superior in terms of potentiometric response, stability, rapidity of response and reproducibility. Testing was done over the concentration range $10^{-1}~10^{-4}M WO_4^{2-}$ in $0.1F-NH_4Ac-NH_4OH$ buffer at pH 8.00 with constant ionic strength. The quality of response is similar to that of corresponding phosphate-sensing electrode. Many common ions interfere.
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