摘要
采用一种新型原子化器——衬钨石墨管,对测定食品及水中微量镧、铕和镱的原子吸收光谱法进行了研究.衬钨石墨管可避免样品直接向石墨体相渗透或扩散,阻止稀土元素与石墨作用生成碳化物,因而这种原于化器能提高分析灵敏度,降低原子化温度和消除记忆效应,使用寿命达150次以上.本法分析镧、铕和镱的灵敏度(1％吸收)分别为8.1×10^(-9)g,3.9×10^(-11g)和4.27×10^(-12)g.方法的相对标准偏差镧为5.9％～9.9％,铕为3.2％～10.2％,镱为2.5％～9.0％.本法与ICP-AES法比较,两者分析结果无显著性差别。
Atomic absorption spectrometric method for the determination of lanthanum, europium and ytterbium in
food and water has been studied using a new type of atomizer——graphite tube lined with tungsten foil. The
graphite tube lined with tungsten foil can avoid the permeance or diffusion of the sample towards graphite
phase, and prevent the formation of carbides between rare earth elements the graphite surface. The atomiza-
tion of the rare earth elements from this tungsten surface gives better analytical sensitivity, lower atomization
temperature and negligible memory effect. The lifetime of this atomizer is more than 150 firings. The analyti-
cal sensitivities (1％ absorption) of lanthanum, europium and ytterium are 8.1×10^(-9)g, 3.9×10^(-11)g and 4.27
×10^(-12)g, respectively. The relative standard deviations of lanthanum, europium and ytterium are between 5.
9％ to 9.9％, 3.2％ to 10.2％ and 2.5％ to 9.0％, respectively. The results obtained by this method are in
good agreement with those from inductive coupled plasma atomic emission spectrometry.
出处
《科技通报》
1993年第1期44-49,共6页
Bulletin of Science and Technology
关键词
原子吸收光谱法
稀土元素
食品
水
atomic absorption spectrometric method
rare earth
element
food
water
