乙醇中甲醇限量检查有品红亚硫酸法和变色酸法等,《中国药典》一九七七年版以来,均采用变色酸法。变色酸法虽已沿用多年,但要具体掌握好检测条件并不容易。《中国药典》一九八五年版又将乙醇中甲醇限量规定加严,由原来的0.25％提高到0.20％,检查时若条件掌握不当,更易使结果产生偏差,为此,笔者在工作实践中对乙醇中甲醇限量检查作了一些探索和改进,以保证检测的准确性。 Ethanol in methanol limit check with malachite sulfurous acid method and color change acid method, “Chinese Pharmacopoeia” since 1977 edition, are using the color change acid method. Chromic acid method has been used for many years, but to grasp the specific test conditions is not easy. The “Chinese Pharmacopoeia” in 1985 edition again ethanol limits the provisions of methanol tighter, from the original 0.25% to 0.20%, check the conditions if the improper grasp, more likely to result in deviation, therefore, in my work practice Methanol limited inspection of ethanol made some exploration and improvement in order to ensure the accuracy of testing.