摘要
为建立一种快速测定食品中重金属铅的新方法,以小麦粉、小米粉、玉米糁、红薯粉为样品,基于微酸性介质中,抗坏血酸存在时铅与碘化钾、十六烷基三甲基溴化铵（CTAB）形成离子缔合物,利用共振光散射技术测定铅.结果表明：铅的最大共振光散射峰位于623.4 nm,铅的质量浓度在0.00 ～ 10.00 ng/mL范围与体系相对共振光强度有良好线性关系,相关系数r为0.997 8,检出限为0.07 ng/mL,样品测定的RSD≤3.1％（n=5）,回收率为99.3％ ～ 100.5％.方法快速简便、灵敏度高,为食品中痕量铅的测定提供了新的分析技术.
A new resonance light scattering （RLS） method for the rapid determination of trace lead in food, such as wheat flour, millet flour, corn grits, sweet potato powder, was developed based on the samples of lead, in slightly acidic medium and ascorbic acid environment, were formed with potassium i- odide, hexadecyl trimethyl ammonium bromide （CTAB） into ion association complex. The results showed that lead had maximum resonance light scattering peak at 623.4 nm. A good liner relationship （ r = 0. 997 8 ） was observed between lead concentration （ in the range of 0.00 - 10.00 ng/mL） and relative scattered light intensity. The detection limit of lead was 0.07 ng/mL and the relative standard deviations （RSD） of precision for 5 replicate determinations were ≤ 3.1%. The average recovery rates of lead in four kinds of food were 99.3% - 100.5%. This new analytical method was simple, rapid, sensitive, and provides new determination technology of trace lead in food.
出处
《粮油食品科技》
北大核心
2014年第2期76-79,共4页
Science and Technology of Cereals,Oils and Foods
基金
河南省重点学科建设基金项目(10466-X-082301)
关键词
共振光散射
食品
痕量铅
测定
resonance light scattering
food
trace lead
determination
