本文選題：牛奶 + 酸奶�。� 參考：《中國乳品工業(yè)》2017年06期

【摘要】：為了簡化檢測牛奶和酸奶中鐵(Fe)、鈣(Ca)、鋅(Zn)、銅(Cu)、錳(Mn)和鋰(Li)6種有益金屬元素的前處理過程,并且以煙臺市為例,了解市售的牛奶和酸奶中這些有益金屬元素的質(zhì)量分數(shù)及其差異,隨機采集了市面上未標明添加了上述有益金屬元素的10個品牌的牛奶和10個品牌的酸奶,檢測了它們6種有益金屬元素的質(zhì)量分數(shù),并比較使用兩種消化方法后的檢測效果以及牛奶和酸奶中有益金屬元素質(zhì)量分數(shù)的差異。實驗采用常規(guī)干式灰化法和簡化后的干法兩種消化方法后,經(jīng)火焰原子吸收光譜法,測定了牛奶和酸奶中6種有益金屬元素的質(zhì)量分數(shù)。結(jié)果表明,牛奶和酸奶中6種有益金屬元素均有檢出,采用常規(guī)干式灰化法和簡化后的干法處理樣品對測定結(jié)果無顯著影響,兩種方法的回收率和精密度均符合實驗要求;煙臺市售的酸奶和牛奶中元素Li和Fe質(zhì)量分數(shù)差異顯著;Ca,Zn,Cu,Mn質(zhì)量分數(shù)差異不顯著。
[Abstract]:In order to simplify the pretreatment of six beneficial metal elements, Fe, Ca, Zn, Cu, mn and Li in milk and yoghurt, and take Yantai as an example, the mass fraction and difference of these beneficial metal elements in milk and yoghurt were studied. Ten brands of milk and 10 brands of yoghurt that were not labeled with the above mentioned beneficial metal elements were randomly collected and their mass fraction of 6 useful metal elements were tested. The results of two digestion methods and the difference of beneficial metal content in milk and yoghurt were compared. The mass fraction of 6 beneficial metal elements in milk and yoghurt were determined by flame atomic absorption spectrometry after routine dry ashing and simplified dry digestion. The results showed that six beneficial metal elements were detected in milk and yoghurt. The sample was treated by conventional dry ashing method and simplified dry method. The recovery and precision of the two methods were in accordance with the experimental requirements. The difference of Li and Fe content in yoghurt and milk in Yantai City was significant.
【作者單位】： 煙臺市疾病預防控制中心;
【分類號】：TS252.7

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