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鄢盛华 《理化检验(化学分册)》1995,31(3):159-159
水中痕量汞的测定目前多采用冷原子吸收法。而借助原子吸收分光光度计的标尺扩展功能较一般测汞仪具有更好的灵敏度。本文利用废旧F732测汞仪的薄膜泵和石英管吸收池作为汞的原子化装置,使汞在普通原子吸收分光光度计上的测定变得简便、易行。用于水中痕量汞的测定,得到满意的效果。 相似文献
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原子吸收分光光度计中光栅的设计及选择 总被引:1,自引:0,他引:1
李昌厚 《分析测试技术与仪器》2005,11(3):167-169
简单论述了光栅在原子吸收分光光度计(AAS)中的作用;提出了一般AAS中不需要使用1800条/mm光栅的理由;同时,对有关问题进行了讨论. 可供AAS的设计者、使用者们参考. 相似文献
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Simultaneous determination of elemental content in water samples by total reflection X-ray fluorescence and atomic absorption spectrometry 总被引:1,自引:0,他引:1
M. G. Macedo-Miranda G. Zarazua E. Mejía-Zarate P. Avila-Pérez B. Barrientos-Becerra S. Tejeda 《Journal of Radioanalytical and Nuclear Chemistry》2009,280(2):427-430
An analytical exercise between two laboratories was performed in order to compare the elemental composition of a water sample.
The metal concentration of Cr, Cu, Fe, Mn, Ni, Pb, and Zn in the water sample was analyzed by Total Reflection X-Ray Fluorescence
and Atomic Absorption Spectrometry. The analysis by Total Reflection X-Ray Spectrometry was realized by an Ital Structures
TX-2000 and the analysis by Atomic Absorption Spectrometry was made by a Perkin Elmer Spectrophotometer Model 3110. Results
show a good agreement in the metal concentrations obtained by both techniques. The variation coefficient between the results
with both techniques was less than 14%. Therefore, it is possible to conclude that both techniques are reliable and adequate
for the determination of these elements in environmental water samples. 相似文献
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《Analytical letters》2012,45(11):817-830
Abstract Simultaneous determination of calcium and magnesium content in human blood serum has been reported as a routine clinical laboratory method, which is rapid, simple, and requires 50 δ of serum for complete analysis with triplicate runs. This is accomplished using a Model 1250 Varian Techtron Atomic Absorption Spectrophotometer with the stoichiometric nitrous oxide-acetylene flame of 0.2 cm red-cone height. Calcium and magnesium standards and also the serum specimens are prepared in aqueous medium containing 2000 ppm potassium chloride. Serum specimens are ultimately diluted to 1:100 fold. About 40–50 samples can be analyzed per hour of instrument operation, if standard solutions and diluted serum specimens are readily available. 相似文献
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McManamon C Burke AM Holmes JD Morris MA 《Journal of colloid and interface science》2012,369(1):330-337
This study examines the synthesis of SBA-15 with tailored pore sizes through controlled thermal treatment for the adsorption of Pb and Cd ions. The aim is to produce a material that can adsorb heavy metals at both high and low concentrations. The materials were characterised by means of N(2) physisorption, powder X-ray diffraction (PXRD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), microanalysis and transmission electron microscopy (TEM). The surface areas ranged from 410 to 871 m(2)g(-1), and pore diameter was increased from 5.9 to 10.8 nm. This method allows for maximum adsorption of metal ions at very low concentrations. Metal ion adsorption was determined using an Atomic Absorption Spectrophotometer. The effects of pH were found to play a major role in the precipitation and, therefore, adsorption of metal ions. This method proved to be efficient at adsorbing large quantities of both metals (39 and 41 mg g(-1) for Pb and Cd, respectively). 相似文献
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Liquid phase benzylation of benzene with benzyl chloride was investigated over different compositions of cobalt zinc ferrite (CoxZn1-xFe2O4, x-0.0, 0.25, 0.5, 0.75, 1.0) nano composites, synthesized by sol–gel method. The un-substituted cobalt ferrite catalyst exhibited excellent activity among the series effecting complete conversion of benzyl chloride in 60?min at 90?°C with 100% selectivity for diphenyl methane. The effect of various reaction parameters on the reaction was studied. Higher benzylation activity of cobalt ferrite nanocomposite is attributed to the presence of higher quantities of moderately acidic sites and a good correlation was observed between surface acidity and benzylation activity of catalysts. The catalysts are reusable without any significant structural change as indicated by X-ray Diffraction (XRD) and Atomic Absorption Spectrophotometer (AAS). 相似文献
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Determination of trace level of selenium and mercury in photographic emulsions by atomic spectroscopy techniques 总被引:1,自引:0,他引:1
Trace level of selenium and mercury in photographic emulsion are used to improve photographic properties. The presence of silver halide in photographic emulsion does not allow the application of the most common analytical methods such as Hydride Generation Atomic Absorption Spectrometry (HG-AAS) and cold vapour Atomic Absorption Spectrometry (CV-AAS). Besides, silver removal was not quantitative, leading to a significant loss of the analytes and low reproducibility. The present work suggest the use of inductively coupled plasma Atomic Emission Spectrometry (ICP-AES) equipped with Ultrasonic Nebulizer (USN) for direct aqueous samples analysis at microgram l-1 level (d.l. 5.1 ppb for Hg and 6.1 ppb for Se). 相似文献
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Methods for metal preconcentration are often described in the literature. However, purposes are often different, depending
on whether the methods are applied in environmental, clinical or technological fields. The respective method needs to be efficient,
give high sensitivity, and ideally also is selective which is useful when used in combination with atomic spectroscopy. This
review presents the actual tendencies in metal preconcentration using techniques such as Flame Atomic Absorption Spectrometry
(FAAS), Electrothermal Atomic Absorption Spectrometry (ETAAS), Hydride Generation Atomic Absorption Spectrometry (HGAAS),
Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
Procedures based on related to electrochemical, coprecipitation/precipitation, liquid–liquid and solid–liquid extraction and
atom trapping mechanisms are presented.
Correspondence: Department of Analytical Chemistry, Universidade Estadual de Campinas – UNICAMP, P.O. Box 6154, 13083-970
Campinas, Brazil. e-mail: zezzi@iqm.unicamp.br
Received December 20, 2001; accepted October 11, 2002 相似文献
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在对原子吸收光谱仪石墨炉电源电路板测绘的基础上,分析了该电源主电路的故障原因,并给出了维修过程。 相似文献
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I. Lavilla 《Talanta》2009,80(1):109-116
In this work, ultrasound-assisted emulsification with a probe system is proposed as a rapid and simple sample treatment for atomic spectrometric determinations (Electrothermal Atomic Absorption Spectrometry, Inductively Coupled Plasma Optical Emission Spectrometry, Flame Atomic Absorption Spectrometry and Cold Vapour Atomic Absorption Spectrometry) of trace elements (As, Cd, Cr, Cu, Hg, Mg, Mn, Ni, Sr and Zn) in cosmetic samples such as shampoos, gel (hair gel), crèmes (body milk, hair conditioner) and oil (body oil). The type of dispersion medium, the sample mass-to-dispersion medium volume ratio, as well as the parameters related to the ultrasound-assisted emulsification (sonication amplitude and treatment time) were exhaustively studied. Only 1 min of ultrasonic shaking and a dispersion medium containing 0.5% (w/v) of SDS + 3% (v/v) of HNO3 or HCl allows obtaining a stable emulsion at least for 3 months. Thermal programs, nebulization of emulsions, speed of pumps and concentration of reagents used in cold vapour generation were optimized. Calibration using aqueous standards was feasible in all cases. Calibration by the standard addition method and recovery studies was also applied for validation. Microwave-assisted digestion and Inductively Coupled Plasma Mass Spectrometry were used for comparison purposes. Relative standard deviations from analysis of five independent emulsions were less than 9% in all cases. 相似文献
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Peter Wilhartitz Hugo M. Ortner Robert Krismer Hermann Krabichler 《Mikrochimica acta》1990,101(1-6):259-271
The applicability of GDMS, SIMS, SSMS, NAA and TMS with AAS, ICP-OES and ICP-MS end determination for routine bulk ultratrace analysis of high purity refractory metals was investigated. Due to the heterogeneous distribution of trace elements in the sub-ppm range, sample consumption and analysis time have a tremendous influence on quantification with procedures of low sample consumption. As an example, GDMS, which is commonly used for ultrapure material certification by most of the manufacturers in Europe and the USA, exhibits discrepancies by more than one order of magnitude for repetitive analyses of a series of trace components in the same sample. Furthermore, results of different laboratories using the same instrument are frequently not comparable. Due to easy standardization and large sample consumption TMS procedures combined with FAAS, GFAAS, ICP-AES and ICP-MS as methods of end determination exhibit better precision and accuracy than GDMS and SIMS. Detection limits are comparably low or even better in case of ICP-MS end determination. TMS procedures are less expensive and less time consuming than highly sophisticated analytical techniques like GDMS, SIMS or NAA. Additionally, they can be easily applied by experienced personnel in a well equipped industrial analytical laboratory.List of Acronyms Used AAS
Atomic Absorption Spectrometry
- FAAS
Flame Atomic Absorption Spectrometry
- GDMB
Gesellschaft Deutscher Metallhütten- und Bergleute
- GDMS
Glow Discharge Mass Spectrometry
- GFAAS
Graphite Furnace Atomic Absorption Spectrometry
- ICP-AES
Inductively Coupled Plasma Atomic Emission Spectrometry
- ICP-MS
Inductively Coupled Plasma Mass Spectrometry
- IDMS
Isotope Dilution Mass Spectrometry
- NAA
Neutron Activation Analysis
- SIMS
Secondary Ion Mass Spectrometry
- SSMS
Spark Source Mass Spectrometry
- TMS
Trace-Matrix Separation
- VLSI
Very Large Scale Integration
- XRFS
X-Ray fluorescence Spectroscopy
Dedicated to Professor Günther Tölg on the occasion of his 60th birthday 相似文献