Adding VC(ascorbic acid/vitamin C) as a protective agent instead of formaldehyde, we have used Laser Raman spectroscopy to experiment on the Raman shift transformation from SO32- to SO42-and then to observe the chemometamorphism of Na2SO3 solution, which is a simple and fast method. The result showed that: provided that continuous exposure to the air, prepared 0. 5mol/L Na2SO3 (aq) use distilled water with boiling and cooling, whereafter adding VC as a protective agent, which can preserve not less than 12h against transformation; provided that acquirement from volumetric flask discontinuously, prepared 0. 5mol/L Na2SO3 (aq) separately use distilled water with N2、with boiling and cooling,with adding 5%VC 5mL, all of which can preserve from 1 day to 3/4/5 days a-gainst transformation.%使用抗坏血酸(VC)代替甲醛作为保护剂,通过拉曼光谱仪测试SO32-、SO42-的拉曼峰的转变过程来观察Na2 SO3溶液变质情况,测试简单,快速.实验表明,Na2 SO3溶于煮沸冷却后的蒸馏水,以VC作为保护剂,当浓度为0.5 mol/L时,可以持续暴露在空气中保存12h以内不变质;当通入N2或煮沸冷却后的蒸馏水或添加5%VC 5 mL的蒸馏水,分别来配制0.5 mol/L的Na2 SO3溶液时,间断取出测试,使Na2 SO3溶液的稳定性从1天分别提高到3、4、5天.
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