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在选择性氧化试剂作用下,甲醇被氧化至甲醛,乙醇不能被氧化至乙醛。以品红亚硫酸作显色剂检测甲醛。该方法最低检测含量为100mg/L(国家食品卫生标准规定:谷物类和薯干类饮用酒中甲醇含量分别不得超过400mg/L和1.2×10~3mg/L),用时5分钟。所用试剂广谱廉价,无需分光光度计、光电比色计等仪器,方法简单实用。当甲醇含量在0.1～3.0×10~3mg/L范围时,有较明显的目视正色差,可以用于饮用酒中甲醇含量的现场快速定性半定量分析。
In the selective oxidation reagent, methanol is oxidized to formaldehyde, and ethanol can not be oxidized to acetaldehyde. For the detection of formaldehyde with magenta sulfurous acid as a developer. The minimum detectable content of this method is 100mg / L (national food hygiene standard stipulates that the methanol content of cereal and dried potato drinks shall not exceed 400mg / L and 1.2 × 10 ~ 3mg / L, respectively) for 5 minutes. Reagents broad spectrum of cheap, no spectrophotometer, photoelectric colorimeter and other equipment, the method is simple and practical. When the methanol content is in the range of 0.1-3.0 × 10-3mg / L, there is a more obvious positive chromatic aberration, which can be used in the fast and qualitative semi-quantitative analysis of methanol content in drinking wine.