Influence of iron-subgroup metals on the atomization of silicon in a graphite furnace

The regime of atomization of Si in the presence of Fe-subgroup metals was investigated with the use of a “Saturn” spectrophotometer and a “Graphit-2” electrothermic atomizer. The optimal operating parameters of the atomizer have been determined. It was established that the optimal value of the ashing and the atomization temperatures are, respectively, 900–1000°C and 2400°C, the optimal rate of temperature rise at the stage of atomization is 1400 K/sec, and the appropriate amount of Fe, Co and Ni additions is 1–2 μg. It was established that the formation of gaseous silicides of the Fe-subgroup metals, the dissociation energies of which are lower than the dissociation energies of Si oxides and carbides, increases the sensitivity for determination of Si. To whom correspondences should be addressed. Institute of Single Crystals, National Academy of Sciences of Ukraine, 60, Lenin Ave., Khar'kov, 310001, Ukraine. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 2, pp. 153–157, March–April, 1999.     

Model for the analytical signal in atomic absorption spectrometry with electrothermal atomization

A method for verification of analytical measurements in electrothermal atomic absorption spectrometry using a phenomenological model for physicochemical atomization processes is discussed. The influence of the sample matrix on basic kinetic parameters of atomization such as the analyte free-atom formation energy and the atomization rate constant has been shown. The similarity of atomization kinetic parameters obtained by calibrating the spectrometer to those for samples under study can be used as a verification criterion for analysis. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 3, pp. 295–298, May–June, 2008.     

Recent highlights in graphite furnace atomic absorption spectrometry

Graphite furnace atomic absorption spectrometry (GFAAS) is an elemental analysis technique that has been employed for virtually all types of samples. Traditionally, hollow cathode lamps, line excitation sources, have been employed for excitation. However, in the past two decades, high resolution continuum source (HR CS) GFAAS has been shown to offer greater potential for multielemental analysis, greater flexibility in wavelength selection, the ability to determine molecules, and better characterization and correction for spectral backgrounds. The recent analytical literature is critically reviewed, including solubilization and preconcentration procedures. Solid and slurry sampling have been the focus of recent work; in particular, the enhanced capabilities of HR CS GFAAS provide green methodology with suitable sensitivity, precision, and accuracy. GFAAS has also been employed for elemental speciation, including characterization of forms using the atomization profiles.     

高分辨连续光源石墨炉原子吸收光谱法测定面制食品中的铝

使用微波消解-高分辨连续光源石墨炉原子吸收光谱法测定四种面制食品(挂面、饺子皮、油条和梳打饼干)中铝的含量.样品置于密闭聚四氟乙烯消解罐中经HNO3和H2O2混合溶液完全消解.对微波消解条件、灰化温度和原子化温度进行了优化.确定最佳实验条件为:消解液HNO3和H2O2体积比7∶1,微波功率1 000 W,190℃消解4...     

辐射加热铝Ka吸收谱测量

 铝K_a吸收谱是诊断辐射加热等离子体温度的重要方法之一。在星光Ⅱ激光装置上，利用激光金膜相互作用产生的X光辐射加热其背侧的铝夹层样品，采用天津Ⅲ号胶片记录的PET晶体谱仪测量了不同激光和样品参数条件下的铝Ka吸收谱。实验观察到非常清晰的类氦到类氟铝离子Ka吸收谱线，采用细致组态模型开展了铝Ka吸收谱的模拟计算，模拟计算结果与实验结果符合得较好，研究结果可应用于辐射不透明度样品温度诊断。     

辐射加热铝Ka吸收谱测量

铝Ka吸收谱是诊断辐射加热等离子体温度的重要方法之一。在星光Ⅱ激光装置上,利用激光金膜相互作用产生的X光辐射加热其背侧的铝夹层样品,采用天津Ⅲ号胶片记录的PET晶体谱仪测量了不同激光和样品参数条件下的铝Ka吸收谱。实验观察到非常清晰的类氦到类氟铝离子Ka吸收谱线,采用细致组态模型开展了铝Ka吸收谱的模拟计算,模拟计算结果与实验结果符合得较好,研究结果可应用于辐射不透明度样品温度诊断。     

悬浮液进样石墨炉原子吸收光谱分析进展

悬浮液石墨炉原子吸收光谱分析结合了固体和液体进样方式的显著优势,是一种相对成熟的技术,并已作为常规分析方法广泛应用于有机和无机复杂基体中微、痕量金属元素的分析测定。文章结合最近10年来所取得的新进展进行综述,着重介绍和评论了悬浮液的制备(介质、稳定剂、质量体积比、粒径、均匀化体系)、基体改进剂、背景校正、方法校正及其分析的精密度等,并对悬浮液石墨炉原子吸收光谱分析的发展趋势进行了展望。全文共引用国内外文献80篇。     

Kinetic studies of antimony and selenium atomization processes including a chemical modifier during their determination by electrothermal atomic absorption spectrometry

We have studied antimony and selenium atomization processes including a chemical matrix modifier (palladium-containing activated carbon) during their determination by electrothermal atomic absorption spectrometry. We have developed and fine-tuned an experimental setup for determining the kinetic characteristics (activation energy and frequency factor) for element atomization processes from measurements in the initial section of the analytical signal. We provide a rationale for the most likely mechanism for the interactions that occur. The results of the kinetic studies of the atomization processes showed that the modifier we developed was highly effective, as a result of formation of a thermally stable condensed system C-Pd-A (where A is the analyte). __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 4, pp. 530–534, July–August, 2006.