摘要
利用微波消解处理牛奶,通过火焰原子吸收光谱法测定钙的质量浓度,探讨微波消解制样技术在乳及乳制品中的应用。对微波消解过程中的硝酸体积、过氧化氢体积及消解时间分别进行单因素试验,在此基础上进行正交试验确定微波消解制样的最佳工艺参数,并对方法的准确度和回收率进行验证。结果表明:最佳消解条件为过氧化氢0.9mL、硝酸4.0mL,微波消解28min,在此条件下,经火焰原子吸收光谱法所测得钙的回收率在96.0%~98.1%之间,相对标准偏差为0.50%。微波消解处理牛奶样品耗时短,消解完全彻底,适合大规模样品的快速处理,并且提高了分析结果的精密度。
Microwave digestion technique was used in the determination of calcium in milk by flame atomic spectrometry and the application of this technique in dairy products was optimized by one-factor-at-a-time and orthogonal array design methods. The optimal digestion conditions were 0.9 mL of nitric acid, 4.0 mL of hydrogen peroxide and 28 min of digestion time. The recovery rate was in range of 96.0%--98.1% for calcium in milk with RSD of 0.50%. Our study shows that microwave digestion allows rapid and large-scale sample pretreatment is helpful to increase the accuracy of determination for calcium because of less time consumption and complete digestion.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2012年第14期162-165,共4页
Food Science
基金
农业部公益性行业(农业)科研专项(200903043)
关键词
微波消解
火焰原子吸收
牛奶
钙
microwave digestion
flame atomic spectrometry
milk
calcium
作者简介
孙琦(1987-),男,硕士研究生,研究方向为食品微生物与发酵工程。E—mail:caassq618@163.com
通信作者:吕加平(1963-),男,研究员,博士,研究方向为食品微生物与发酵和乳品科学。E—mail:lvjp586@vip.sina.com