异抗坏血酸稳定亚硫酸盐的制备及其贮存稳定性研究

Preparation of Isoascorbic Acid Stabilized Sulfite and a Study of Its Storage Stability

通过除氧试验和空气氧化试验，研究了异抗坏血酸对亚硫酸盐自动氧化的阻滞作用。结果表明，自由基链反应引发剂铜离子能够加速亚硫酸盐与氧的反应，自由基吸收剂异抗坏血酸能够通过消除亚硫酸盐氧化过程中生成的自由基而抑制反应，水的ｐＨ值、碱度和硬度成份则无影响。试验结果为亚硫酸盐氧化的自由基机理提供了有力的证据，也为亚硫酸盐的贮存失效提供了有效的防止方法。

The inhibition of isoascorbic acid on sulfite automatic oxidation was studied by way of oxygen removal and air oxidation tests. The investigation results show that Cu2+ as a radical chain reaction initiator can accelerate the reaction of sulfite with oxygen. The isoascorbic acid as a radical absorbent can inhibit the reaction by removing the free radical produced in the sulfite oxidation process. Water pH value, hardness and alkalinity do not exercise any influence on the reaction. The test results provide an important evidence for the free radical chain mechanism of sulfite oxidation and also an effective method for preventing sulfite failure during its storage.