傅里叶变换红外光谱法检测火锅用牛油中固体石蜡  

FT-IR Spectrometric Testing of Paraffin in Butter Used in Chafing Dishes

作　　者：周颖[1] 陈亚林[1] 张学煃[1] 

机构地区：[1]重庆市疾病预防控制中心,重庆400042

出　　处：《理化检验（化学分册）》2008年第7期653-654,657,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：研究了傅里叶变换红外光谱法测定火锅用牛油中非法加入的固体石蜡,取市场贩卖的炼制凝固牛油1g左右,用2 mol·L^(-1)氢氧化钾乙醇溶液30 mL皂化,皂化完成后速冻皂化液,用自制小竹签挑取液面漂浮物于傅里叶变换红外光谱仪的固相样品测试台上,于450～3 500 cm^(-1)波数范围内进行测定,在721 cm^(-1)波数处作定性检测。于空白的牛油样品中加入低至0.05%的固体石蜡即能检出明显的红外吸收谱图。FT-IR spectrometry was applied to the testing of paraffin, which is illegally admixed with buffer used in chafing dishes. About 1 g of butter bought from the market was taken as a sample and saponified in 30 mL of 2 mol ·L^-1 alcoholic solution of potassium hydroxide. The saponified solution was quick-frozen and the floats on the surface were pick up with a self-made bamboo slice and transferred onto the testing plate of the IR-spectrograph. IR-determination was made by scanning in the wave number range of 450 cm^-1 to 3 500 cm^-1, and qualitative analysis was performed at 721 cm^-1. A significant IR spectrum was observed even when as low as 0. 05% （mass fraction） of paraffin was added to a blank sample of butter.

关 键 词：傅里叶变换红外光谱法 炼制牛油 固体石蜡 非法添加物 

分 类 号：O657.33[理学—分析化学]