ポーラログラフ法によるハイドロキノンジメチルエーテル(DEHQ)の定量

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DEHQ was nitrated by a mixed acid (HNO3 : HClO4-1 : 1) and determined polarographically, utilizing the reduction of nitro group. 1.05.0× 10-3 mole DEHQ in 5 ml methanol solution was nitrated quantitatively by 4 ml mixed acid in 10 min.at 40°C. The dinitration did not occur in the condition. DEHQ was nitrated in a water-methanol solution in a milder condition than that for its nitration in methanol. Nitro-DEHQ gives a wave, of which half wave potential was -0.17 V vs. S. C. E. at pH 2.0 in phosphate buffer. Comparison of the wave height to that of nitrophenol indicates that the polarographic reduction proceeded to the amine. The concentration of gelatin as a maximum suppressor give a larger influence on the wave height. Although hydroquinone and its monomethyl ether interfere, . DEHQ can be separated from them by a preliminary ether extraction at pH 12.0. The method was applied to the determination of DEHQ in methyl-metacrylate in which 0.1% DEHQ was determined within an error -5%.
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