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本文介绍用压电石英装置测定低浓度的维生素C(Vc)。原理是在柠檬酸钠和盐酸等介质存在下,Vc同碘反应,测量银板压电石英晶体频率的改变来间接测量Vc的浓度。方法灵敏、简单、准确性好。硫酸钠、氯化钙、糖、淀粉、谷氨酸等对本法测定无干扰,等摩尔铜盐有干扰,若在20mmol/L EDTA存在下,则无干扰。Vc水溶液的浓度在2×10~(-7)～4×10~(-6) mol/L范围内对频率改变制成的标
This article describes the use of piezoelectric quartz device for the determination of low concentrations of vitamin C (Vc). The principle is in the presence of sodium citrate and hydrochloric acid and other media, Vc with iodine reaction to measure the change in the frequency of silver crystal piezoelectric quartz crystal to indirectly measure the concentration of Vc. The method is sensitive, simple and accurate. Sodium sulfate, calcium chloride, sugar, starch, glutamic acid and other non-interference on the determination of this law, the equivalent molar copper salt interference, if in the presence of 20mmol / L EDTA, then no interference. The concentration of Vc solution in the range of 2 × 10 ~ (-7) ~ 4 × 10 ~ (-6) mol / L range of frequency made of the standard