摘要
建立食品模拟物中铝和六价铬的紫外分光光度测定方法。用含内涂层的金属饮料罐(两片罐和三片罐)分别盛装水、3%乙酸水溶液、10%乙醇水溶液,于40℃浸泡240h,得到食品模拟物。水、3%乙酸水溶液食品模拟物样品直接测定,10%乙醇水溶液食品模拟物经蒸发乙醇再测定。采用二苯碳酰二肼分光光度法测定六价铬,铬天青S分光光度法测定铝。六价铬的方法检出限为10ng/mL,方法回收率在82.0%~101%;铝的方法检出限为25ng/mL,回收率在82.2%~108%。该方法准确度高,操作简单。
Methods for determination of aluminium and chromium(Ⅵ) in food simulants by ultraviolet spectrophotometry were established.Beverage cans were filled with different kinds of food simulants and kept in thermostat at 40 ℃ for 240 h.Aluminium was determined by chrome azurol S spectrophotometric method.Chromium(Ⅵ) was determined by 1,5-Dtphenylcarbohydrazide spectrophotometric method.The detection limits were 10 ng/mL for Cr(VI) and 25 ng/mL for Al.The average recoveries were from 82.0% to 101% for Cr(Ⅵ),and 82.2% to 108% for Al.The migration of Al from metal cans to food simulants was also discussed.The method for determination of Cr(Ⅵ) and Al in food simulants is precise and simple.
出处
《食品与机械》
CSCD
北大核心
2012年第3期65-67,共3页
Food and Machinery
基金
国家科技支撑计划项目(编号:2009BADB9B04)
广东省科技计划项目(编号:2008B030303069
2007B023001001)
关键词
食品模拟物
金属罐
紫外分光光度法
铝
六价铬
测定
food simulants; metal can; ultraviolet spectrophotometry; aluminium; chromium(VI); determination