摘要
对国标法食品中铝含量测定方法进行改进,用干法消化代替湿法消解。样品经干法消化后,在醋酸—醋酸钠缓冲溶液中,三价铝离子与铬天青-S及溴化十六烷基三甲基铵反应生成蓝色三元络合物,在610nm处测其吸光度,吸光度在0 6μg/25mL浓度范围内与铝含量线性关系良好(r=0.9992),相对标准偏差在1.59%4.47%之间,回收率在95.8%103.8%之间。目前国际通用方法为湿法消解,其消解液中会残余一定量的高氯酸,导致灵敏度低、空白值偏高、显色反应性差等弊端。本文采用干法消化,操作简单,加入试剂少,试剂污染小,减少了强酸给环境带来的危害,并对市场上的薯片、油条、馒头等食品,用改进国标法测定其铝含量,灵敏度高,重现性好,结果令人满意,适用食品中铝含量的检测。
The experiment used dry digestion to replace wet digestion in determination of aluminum according to the national standard determination method.Mter dry digestion,samples were added in acetic acid-sodium acetate buffer solution,trivalent aluminum ion with chromium azure-S and the bromination hexadecyl trimethyl ammonium formed a complex compound with blue color.The complex absorbance was positively related with the content of aluminum in the solution at 610nm,with a good linear in the concentration of 0 ～6μg/25mL （r =0.9992）,RSD was between 1.59％ ～4.47％and the recovery was between 95.8％ ～ 103.8％.In the present internationally used method of wet digestion,perchloric acid residual in the digestion solution leads to low sensitivity,higher blank value,and poor color reactive.Dry digestion was simple to operate,use fewer reagents and lower the acid damage to the environment.The results using dry digestion to chips,fried dough sticks and steamed buns showed higher sensitivity,good reproducibility.Therefore,it is suitable for the detection aluminum content in food.
出处
《中国食品添加剂》
CAS
北大核心
2013年第5期219-222,共4页
China Food Additives
关键词
铝
食品
铬天青-S
分光光度法
aluminum
food
chrome azurol-S
spectrophotometer
