Electrochemical reduction of carbon dioxide in nonaqueous electrolytes consisting of DMSO as lan aprotic solvent and tetraalky1αmmonium salts such as(C2H5)、NC1041［TEAP］，(C2H5)4NBr l［TE真3r］ and(n-C4Hg)4NBr；［TBABr］was investigated using various solid state metal electrodes such as FPb，In，Zn and Sn・The fOllOWing reSUltS Were Obtained． (1)In the CaSe Of Pb eleCtrOdeS，the・main reduction product of CO、was oxalic acid．Additionally，many higher carboxylic acids such as tartaric，
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Ito et al. (1982) studied this question.