共查询到17条相似文献,搜索用时 62 毫秒
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钽丝圈原子化器原子吸收光谱法的研究 总被引:1,自引:0,他引:1
用自制的钽丝圈原子化器与原子吸收光谱仪联用,以氩气为保护气,测定了Cd、Cu和Zn,研究了这一原子化器的性能。在选定的仪器工作条件下,测定Cd,Cu和Zn的特征浓度分别为2、30和7ng/mL。对实际样品中的Cu、Zn和Cd进行测定,其结果令人满意。 相似文献
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自行设计并组装了一套以声光可调滤光片(AOTF)为波长选择系统的波长检测型表面等离子体子共振(SPR)传感器装置,介绍了AOTF的特点和性能.研究了传感器对乙醇、葡萄糖和蔗糖的响应特性,三者的线性范围分别为5%~60%(体积分数),0.028~0.280和0.014~0.140mol/L.并对葡萄糖和蔗糖的混合溶液进行了分析.实际样品的测定结果与国家标准方法的测定值相符合 相似文献
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便携式钨丝电热原子吸收光谱仪测定水样中铜、铬、铅和镉 总被引:6,自引:1,他引:6
以钨丝原子化器和小型化CCD检测器为主要部件,组装了便携式钨丝电热原子吸收光谱分析仪,优化了载气(Ar/H2) 流速、空心阴极灯位置、原子化器高度、灰化和原子化电流等主要仪器条件.最佳载气(Ar/H2)流速(mL/min)为600 /300(Cd),800/200(Cu, Pb, Cr);灰化电流为2.9~3.2 A;原子化电流为8.5 A;CCD的积分时间为50 ms.并在优化的仪器条件下准确测定了环境水样中的铜(Cu)、铬(Cr)、铅(Pb)和镉(Cd),进样10 μL时,其检出限分别为2、5、9和0.5 μg/L.此便携式原子吸收光谱仪在环境水样痕量元素分析中可望有良好的应用前景. 相似文献
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利用Se作基体改进剂,详细研究了汞的石墨炉原子吸收测定条件,并将方法成功地用于人发中痕量汞的测定。 相似文献
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电热原子吸收法测定人发中硒时不同改进剂的研究 总被引:2,自引:0,他引:2
对于生物体中硒的测定,国内外已有大量报道,所用方法也相当广泛。本文利用石墨炉原子吸收对人发中硒的测定进行了研究;对使用较多的两种硒的基体改进剂:铜与镍的作用与效果进行了研究,发现铜较镍在某些方面更为优越。当选用100 μg/mL的铜作改进剂时,硒的特征浓度为0.13 ng/1%abs,测定精度为3.4%~5.4%;线性范围达400 ng。 相似文献
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石墨炉原子吸收光谱作为灵敏的分析方法,已经得到了越来越广泛的应用。但是,对于稀土元素来说,它并不是一个十分理想的分析方法,其原因是,在高温石墨炉中,稀土元素容易与碳生成高温碳化物,致使稀土元素需要的原子化温度很高,和得到的灵敏度较低,而且记忆效应比较严重。采用我们提出的衬钽技术制作的衬钽管,并结合95%Ar和5%H_2 相似文献
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Graphite filter atomizers (GFA) for electrothermal atomic absorption spectrometry (ETAAS) show substantial advantages over commonly employed electrothermal vaporizers and atomizers, tube and platform furnaces, for direct determination of high and medium volatility elements in matrices associated with strong spectral and chemical interferences. Two factors provide lower limits of detection and shorter determination cycles with the GFA: the vaporization area in the GFA is separated from the absorption volume by a porous graphite partition; the sample is distributed over a large surface of a collector in the vaporization area. These factors convert the GFA into an efficient chemical reactor. The research concerning the GFA concept, technique and analytical methodology, carried out mainly in the author's laboratory in Russia and South Africa, is reviewed. Examples of analytical applications of the GFA in AAS for analysis of organic liquids and slurries, bio-samples and food products are given. Future prospects for the GFA are discussed in connection with analyses by fast multi-element AAS. 相似文献
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Anderson Schwingel Ribeiro Marco Aurlio Zezzi Arruda Solange Cadore 《Spectrochimica Acta Part B: Atomic Spectroscopy》2002,57(12):2441-2120
A method for the determination of bismuth in metallurgical materials using hydride generation coupled with a merging zones flow system and atomic absorption spectrometry using a quartz tube atomizer with tungsten coil is proposed. The parameters related to the bismuthine generation, the flow injection system and the use of a tungsten coil were studied and the optimized system shows a wide calibration range and good stability over time, without losses in sensitivity. The analytical curve is linear from 10 to 750 μg l−1 of Bi with R0.999. A detection limit of 1.9 ng Bi and an analytical frequency of 60 determinations per hour were obtained. Five metallurgical reference materials were analyzed with the proposed method after their acid dissolution. The results obtained were in good agreement with certified or recommended values, and the relative standard deviations were lower than 5%. 相似文献
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Dmitri A. Katskov Yuri M.Sadagov 《Spectrochimica Acta Part B: Atomic Spectroscopy》2011,66(6):451-460
The methodology of simultaneous multi-element electrothermal atomic absorption spectrometry (ETAAS-Electrothermal Atomic Absorption Spectrometry) stipulates rigid requirements to the design and operation of the atomizer. It must provide high degree of atomization for the group of analytes, invariant respective to the vaporization kinetics and heating ramp residence time of atoms in the absorption volume and absence of memory effects from major sample components. For the low resolution spectrometer with a continuum radiation source the reduced compared to traditional ETAAS (Electrothermal Atomic Absorption Spectrometry) sensitivity should be, at least partially, compensated by creating high density of atomic vapor in the absorption pulse. The sought-for characteristics were obtained for the 18 mm in length and 2.5 mm in internal diameter longitudinally heated graphite tube atomizer furnished with 2-4.5 mg of ring shaped carbon fiber yarn collector. The collector located next to the sampling port provides large substrate area that helps to keep the sample and its residue in the central part of the tube after drying. The collector also provides a “platform” effect that delays the vaporization and stipulates vapor release into absorption volume having already stabilized gas temperature. Due to the shape of external surface of the tube, presence of collector and rapid (about 10 °C/ms) heating, an inverse temperature distribution along the tube is attained at the beginnings of the atomization and cleaning steps. The effect is employed for cleaning of the atomizer using the set of short maximum power heating pulses. Preparation, optimal maintenance of the atomizer and its compliance to the multi-element determination requirements are evaluated and discussed. The experimental setup provides direct simultaneous determination of large group of element within 3-4 order concentration range. Limits of detection are close to those for sequential single element determination in Flame AAS with primary line source that is 50-1000 times higher than the limits obtainable with common ETAAS (Electrothermal Atomic Absorption Spectrometry) instrumentation. 相似文献
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A novel modular L-shaped design of hydride atomizer for atomic absorption spectrometry is described. It makes it possible to replace the optical tube of the atomizer and, mainly, to employ optical tubes made also from other materials than fused quartz. The design is useful mainly for further improvement of hydride atomizers based on the multiatomizer concept. Employing selenium hydride as the analyte and arsine as the interferent, a preliminary evaluation of performance of three types of L-shaped multiatomizers based on various optical tubes in terms of sensitivity, linearity of calibration graph and resistance to atomization interferences is made. The “classical” T-shaped multiatomizer was employed as a reference.The L-shaped multiatomizer with the optical tube analogous to that employed in the “classical” T-shaped multiatomizer offers virtually the same performance as the reference multiatomizer. Optical tube made of fused quartz with holes with smaller diameters does not offer significantly better performance compared to the reference T-shaped multiatomizer. However, the L-shaped multiatomizer with optical tube fabricated from porous quartz glass overpowers all the other multiatomizers substantially in terms of the resistance against interferences: even the maximum As interferent concentration of 5 µg ml− 1 does not significantly influence the observed signal. This should be compared with multiatomizers based on plain fused quartz tubes with holes: tolerance limit around 0.5 µg ml− 1; interferent concentration of 1 µg ml− 1 causing 20% signal depression. 相似文献
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《Analytical letters》2012,45(9):1399-1405
Abstract A sensitive atomic absorption spectrometry with a thin-wall tungsten tube atomizer is described. By addition of thiocyanate, sensitivities and detection limits were improved over that of a conventional atomizer for several elements. 相似文献
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Flame furnace atomic absorption spectrometry (FF-AAS) is a newly developed flame atomic absorption spectrometric technique based on arranging a flame furnace onto the top of the flame burner head. In this fundamental investigation, 25 elements were carefully tested by using either thermospray FF-AAS or tungsten coil electrothermal vaporization FF-AAS, of which 15 volatile and semi-volatile elements (Cd, Tl, Ag, Pb, Zn, Hg, Cu, Sb, Bi, Te, In, As, Se, Sn and Au) exhibited better limits of detection compared to those by conventional FAAS; however, non-volatile or refractory elements (Fe, Co, Ni, Cr, Mn, Pd, Pt, Al, Be and V) showed inferior sensitivities by the proposed methods. 相似文献