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在 pH =7.8的NaOH KH2 PO4 底液中 ,用单扫示波极谱法可以得到一灵敏的丹皮酚导数还原峰 ,其峰电位Ep=- 1.6 5V(vs .SCE) .峰电流与丹皮酚的浓度在 4 .0× 10 - 7～ 1.0× 10 - 5mol·L- 1范围内呈线性关系 (r =0 .9998) ,检出限为 2 .0× 10 - 7mol·L- 1.该法用于牡丹皮中丹皮酚质量分数的测定 ,结果令人满意 .用线性扫描和循环伏安法研究体系的行为 ,结果表明 ,其电极过程为具有吸附性的不可逆过程
In NaOH KH2PO4 solution with pH = 7.8, a sensitive decay peak of paeonol derivative can be obtained by single sweep polarography with a peak potential Ep = -1.65 V (vs. The linear relationship was found between the concentration of phenol and phenol in the range of 4.0 × 10 -7 ~ 1.0 × 10 -5 mol·L -1 (r = 0.9998). The detection limit was 2.0 × 10 -7 mol·L -1 The method was applied to the determination of paeonol mass fraction in Cortex Moutan and the results were satisfactory.The behavior of the system was investigated by linear sweep and cyclic voltammetry.The results showed that the electrode process was an irreversible process with adsorption