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Studies on The Periodecety of Mole Sensitivity and Atomization in Flameless Atomic Absorption Spectrometry

无焰原子吸收光谱中摩尔灵敏度和原子化周期的研究

基本信息

批准号：
01470038
负责人：
IWAMOTO ETSURO
金额：
$ 3.33万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01470038/
关键词：
Flameless Atomic Absorption Spectrometry Metal tubes Tungstate-Coated Tube Atomization Mechanism Tin Determination In Sea Water Tin Determination In Biological Samples 黒鉛炉原子吸光

项目摘要

In flameless atomic absorption spectrometry the tungsten tube and metal-coated tubes were used and the periodic trends of sensitivity and atomization mechanism were studied comparing with those for the graphite tubes. Furthermore, the method the tungsten-coated tube was applied to the determination of tin in biological and environmental samples.1. Of matrix modifiers used so far the oxide of tungsten has been shown to enhance the tin sensitivity and the tungsten-coated tube was prepared by soaking for at least 24 hr in sodium tungstate solution (5 % w/v). In this work, the tungstate-coated tube was prepared without soaking in the tungstate solution. The coating process involved just injecting 100 mu 1 of a sodium tungstate solution (0.01 MU) into a graphite tube, followed by heating the tube according to the temperature program similar to an atomization cycle. The coated-surface gave stable signal for at least 100 firings. The sensitivity for tin, tantalum and silicon was improved with … More the tungstate-coated tubes compared with that obtained with uncoated tubes.2. Although for tin in the simple matrix 0.01 MU HCl the tungstate-coated pyrolytic graphite (W-PG) tube gave the highest sensitivity, for tin in the complex matrix of fish fillet the tungstate-coated nonpyrolytic graphite (W-NPG) tube gave the highest and most stable absorption signal. The W-NPG tube gave the good analytical result for tin analysis in sea bass : 2.40 <plus-minus> 0.09 mu g/g (5 determinations) compared with the reported value 2.4 <plus-minus> 0.1 mu3. The use of the W-coated tube and palladium (II) solution as a matrix modifier provided the direct method of the tin determination in sea water without pretreatment : a 1 % absorption was refered to 0.0028 ng at an ashing temperature of 1700 ﾟC.4. Organosilicon as well as inorganic silicon were determined with a high sensitivity by using the W-coated tube. It was found that the atomization process is SiO_<2(g)> -> SiO_<2(g)> -> SiO_<(g)> -> Si_<(g)> for both the samples. Less

在无焰原子吸收光谱分析中，使用了钨管和金属涂层管，并与石墨管进行了比较，研究了灵敏度的周期性变化和原子化机理。并将该方法应用于生物样品和环境样品中锡的测定。在迄今使用的基质改进剂中，钨的氧化物被证明能提高锡敏感度，钨涂层管是通过在5%W/V的钨酸钠溶液中浸泡至少24小时而制备的。在本工作中，在没有浸泡在钨酸盐溶液中的情况下制备了钨酸盐涂层管材。涂层过程只需将100mU的钨酸钠溶液(0.01mU)注入石墨管，然后按照类似于雾化周期的温度程序加热管子。涂层表面至少发射了100次稳定的信号。用…提高了锡、钽和硅的灵敏度与未涂覆的管材相比，涂覆钨酸盐的管子更多。对于简单基质0.01MU HCl中的锡，钨酸盐涂层热解石墨(W-PG)管的灵敏度最高，而对于鱼片复杂基质中的锡，钨酸盐涂层非热解石墨(W-NPG)管的吸收信号最高且最稳定。用W-NPG管测定海鱼中锡的分析结果良好，正负0.09微克/克(5次测定)，与文献报道的2.4微克/克(正负0.10微克/克)0.10微升。采用镀钨试管和钯(II)溶液作为基体改进剂，无需前处理即可直接测定海水中的锡：在1700ﾟC.4灰化温度下，1%的吸光度为0.0028 ng。用涂钨试管对有机硅和无机硅进行了高灵敏度的测定。发现两种样品的雾化过程均为SiO_&lt；2(G)&gt；-&gt；SiO_&lt；2(G)&gt；-&gt；SiO_&lt；(G)&gt；-&gt；较少