摘要
在酸性介质中,甲醛对溴酸钾氧化刚果红褪色反应有催化作用,而表面活性剂十二烷基磺酸钠对该褪色反应起到增敏作用,据此建立了一种高灵敏光度法测定痕量甲醛的新方法。在选定的条件下,甲醛浓度在0.02~1.0μg/m L范围内与刚果红褪色程度呈良好的线性关系,线性回归方程为ΔA=0.140 3C_(甲醛)+0.278 6,方法的检出限为6.2ng/m L,相对标准偏差为2.7%(C_(HCHO)=0.1μg/m L,n=8)。该法用于腐竹中痕量甲醛的测定,回收率在96.50%~109.0%之间。
In acid medium, the fading reaction between potassium bromate and Congo red could be catalyzed by trace formaldehyde. Moreover, sodium dodecyl sulfonate, a surfactant, could obviously enhance this catalytic fading reaction. Based on these observations, a novel and sensitive kinetic spectrophometric method for the detection of formaldehyde was developed. Under the selected conditions, the relative absorbance was proportional to formaldehyde concentration in the range of 0.02-1.0 μg.mL-1 with a detection limit of 6.2 ng·mL-1 and relative standard deviation was 2.7% （CHCHO=0.1μg/mL, n=8）. The linear regression equation was △A=0. 140 3C甲醛＋0.278 6 （C： μg·mL^-1）. The proposed method had been applied to the determination of formaldehyde in dried beancurd stick with satisfactory results, and the spike recoveries were between 96.50% and 109.0%.
出处
《食品工业》
北大核心
2017年第8期302-305,共4页
The Food Industry
基金
陕西省教育厅专项科研基金项目(16JK1131)
关键词
催化光度法
甲醛
胶束
溴酸钾
刚果红
腐竹
catalytic spectphotometry
formaldehyde
micelles
potassium brpmate
Congo red
dried beancurd stick
