| 胭脂红酸极谱行为的研究 |
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| 引用本文： | 李南强,闵静.胭脂红酸极谱行为的研究[J].物理化学学报,1986,2(6):549-553. |
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| 作者姓名： | 李南强 闵静 |
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| 作者单位： | Department of Chemistry; Peking University; Beijing |
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| 摘 要： | 在醋酸盐缓冲溶液中, 可获得胭脂红酸的单扫可逆吸附波。在pH4.3时, E_p=一0.65 V(vs. S.C.E.), 电极反应是由醌型还原为氢醌型。胭脂红酸在汞电极上的吸附符合Frumkin等温武。测得吸附系数β=7.0×10~6, 作用因素v=-0.92, 吸附速率常数k_(ads)=9.7×10~(-8) cms~(-1)。
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| 收稿时间： | 1985-10-17 |
| 修稿时间： | 1986-04-04 |
A POLAROGRAPHIC STUDY OF CARMINIC ACID |
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| Li Nanqiang,Min Jing.A POLAROGRAPHIC STUDY OF CARMINIC ACID[J].Acta Physico-Chimica Sinica,1986,2(6):549-553. |
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| Authors: | Li Nanqiang Min Jing |
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| Institution: | Department of Chemistry; Peking University; Beijing |
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| Abstract: | In 0.2 mol L~(-1)acetate buffer Solution, at pH 4.2—4.5, carminic acid exhibits a reversible adsorptive wave in single-sweep polarogram. The electrode reaction is(H_2L~(-))_(ads)+2H~++2e<=>(H_2L′~-)_(ads) H_2L~- and H_2L′~(-) are the anthraqluinone and dihydroanthraquinone ions of carminic acid respectively. On the surface of mercury electrode,the adsorption of carminic acid obeys Frumkin adsorption isotherm The adsorption coefficient(β=7.0×10~6), the interaction factor(v=-0.92), the amount of saturated adsorption (Γ_s=1.39×10~(-10) mol cm~(-2) and t... |
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