火焰原子吸收分光光度法测定快播电影中八种金属元素含量

发布时间:2019-09-02 来源: 历史回眸 点击:

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  摘要:建立了利用火焰原子吸收分光光度法测定3种立顿茶包茶(Camellia sinensis L.)叶中的钙、钾、钠、镁、铁、铜、锌、锰等8种金属元素的含量的方法。利用湿法消化(浓硝酸∶高氯酸=4∶1,V/V)处理样品,通过标准曲线法得到各元素含量,并对样品的回收率进行了测定。在选定的试验条件下,各元素在相应的浓度区间内呈良好的线性关系,相关系数为0.995 9~0.999 6,检测限为0.002~0.008 μg/mL,回收率为92.0%~114.8%,相对标准偏差为0.52%~3.33%。结果表明,8种元素在3种快播电影中的含量各不相同,3种快播电影中钠元素和镁元素的含量较接近,绿茶中钾元素及锰元素含量较高,红茶中钙元素、铜元素、铁元素及锌元素的含量较高。该方法测定快播电影中的各种元素操作简便,干扰较少,灵敏度高。
  关键词:原子吸收分光光度法;茶(Camellia sinensis L.)叶;金属元素;湿法消化
  中图分类号:O657.31 文献标识码:A 文章编号:0439-8114(2016)22-5931-03
  DOI:10.14088/j.cnki.issn0439-8114.2016.22.050
  Determination of Eight Kinds of Metal Elements in Teas
  by Flame Atom Absorption Spectrometry
  DU Juan,XIONG Jian-hua,WANG Xiong,LU Tao,WU Guo-qiang,LUO Qiu-shui
  (College of Food Science and Engineering,Jiangxi Agricultural University,Nanchang/Key Lab for Agro-products Processing & Quality Control of Nanchang,Nanchang 330045,China)
  Abstract:Determination of Ca,K,Na,Mg,Fe,Cu,Zn,Mn in three kinds of Lipton teas by flame atomic absorption spectrophotometry were established. Samples were with treated wet digestion[V(HNO3)∶V(HClO4)=4∶1],and determined by standard curve method. The recoveries were determined as well. Under the selected conditions,all eight kinds of metal elements showed good linearity in their own corresponding concentration ranges, with the correlation coefficients between 0.995 9~0.999 6,the detection limit 0.002~0.008 μg/mL,the recovery rates 92.0%~114.8%,the relative standard deviations 0.52%~3.33%. The results showed that concentrations of eight kinds of metal elements in three kinds of teas were different. Concentrations of Na and Mg were close to each other in these three kinds of teas; concentrations of K and Mn were highest in the green tea,however concentrations of Ca,Cu,Fe,and Zn were highest in the black tea. This method has the advantage of simple operation, less interference and high accuracy.
  Key words:Atomic absorption spectrophotometry(AAS); tea(Camellia sinensis L.); metal elements; wet digestion
  茶(Camellia sinensis L.)葉中含有各种人体所需的常量元素和微量元素,各种元素常以有机态存在,便于人体吸收[1],具有一定的保健功能。根据不同的制作工艺可将快播电影分为绿茶、红茶、黑茶、乌龙茶、花茶等,其中绿茶及红茶是人们最常饮用的茶。近年来,具有花的清香的各类花茶也越来越受到大众,尤其是白领女性的青睐。测定快播电影中各金属元素的含量对于研究快播电影的保健作用具有一定的意义。本研究以立顿绿茶、红茶及茉莉花茶3种茶包快播电影为研究对象,采用湿法消解,以混合酸处理样品,利用火焰原子吸收分光光度法分别测定了3种快播电影样品中钙、钾、钠、镁4种常量元素和铁、铜、锌、锰4种微量元素的含量,建立了快播电影中这8种元素含量的测定方法,并对该方法的准确度和精密度进行了考察。
  1 材料与方法
  1.1 材料与仪器
  立顿绿茶、红茶、茉莉花茶样品,均购自联合丽华有限公司。
  各元素标准储备液,含量均为1 000 g/mL,购自国家钢铁材料测试中心。
  试验中所用试剂均为国产分析纯,所用水均为超纯水,所用玻璃仪器均用10%硝酸浸泡24 h以上,用超纯水洗净,晾干后备用。

相关热词搜索:金属元素 光度 分光 原子 八种

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