酒类中微量甲醛的快速测定新方法  

A New Method for Rapid Determination of Trace Formaldehyde in Alcohol

作　　者：王健[1] 崔艳梅[1] 杨明敏[1] 陈辉东[1] 

机构地区：[1]南京农业大学理学院,南京210095

出　　处：《分析科学学报》2007年第1期88-90,共3页Journal of Analytical Science

摘　　要：在FeCl3存在条件下，甲醛与自制蛋白液显色剂能生成紫色化合物，藉此可以定量测定微量甲醛。方法线性范围为1～10弘g／10mL，线性相关系数r^2=0．996，检出限为0·05μg／mL。用该法测定经活性炭脱色的啤酒和白酒中的甲醛含量，回收率为96·46%～103．32％，相对标准偏差为1．36％～2．09％（n=6）．A new spectrophotometric method for determination of trace formaldehyde in beer was developed with detection wavelength at 555 nm. Based on studies of reaction conditions, e. g. reagent concentration, reaction temperature and time, and the optimal experimental conditions were established. A 4 mL volume of egg white reagent and a 1.0 mL volume of FeCl3 solution were added into a 4 mL volume of a beer sample, and the mixture was heated at 70℃ for 10 min. After cooling, the coloring solution was determined. The detection limits was 0.05μg/mL in beer with a correlation coefficient （r^2） of 0. 996. The recoveries were 96.46%-103.32% and relative standard deviations were 1.36%-2.09% （n=6）.

关 键 词：甲醛 蛋白液显色剂 啤酒 白酒 光度分析 

分 类 号：O657.32[理学—分析化学]