The status of current techniques and methods of atomic absorption (AA) spectroscopy (flame, hybrid, and furnace AA) is discussed, including limitations. Technological opportunities and how they may be used in AA are also discussed, focusing on automation, microprocessors, continuum ...

... systems including polarography, atomic absorption spectroscopy (AA), graphite furnace atomic absorption spectrophotometry (GPAA), inductively ...

... ASOPS measurements are made quantitative by making simultaneous measurements using atomic absorption spectroscopy (AAS). ...

... sensor to detect metal loss in rocket engine components ranging from wear to eminent catastrophic failure using atomic absorption spectroscopy (AAS). ...

have included the use of atomic absorption spectroscopy (AAS), inductively coupled plasma atomic emission spectroscopy (ICPAES) and inductively coupled plasma mass spectrometry...

A method for determining high concentrations of sodium by Atomic Absorption Spectroscopy (AAS) was developed. Parameter values were set and an interfering ion study completed. This technique utilizing sodium atomic absorption of zinc ion emission from zin...

Four different techniques for sample preparation were evaluated for determining vanadium and nickel in crude oils by atomic absorption (AA) spectroscopy: (1) The flame-analyzed dilution method which consists of direct-flame AA analysis after diluting the ...

The application of the Zeeman effect to atomic absorption spectroscopy has been studied over the past several years. This technique has a larger area of application than conventional AAS because of its high degree of selectivity. The ZAA technique can be ...

potentiometrically, atomic absorption spectroscopy (AAS), filtration. The Hubbard Brook Experimental Forest (HBEF) is a 3160 hectare ...

Solution chemistry analyses (atomic absorption spectroscopy (AA, below left), ion chromatography (IC, below right), pH, electrical conductivity, etc. ...

The concentration of specific minerals in foods can be determined by a variety of methods. The aim of this lab is to acquaint you with the use of atomic absorption spectroscopy (AAS) and atomic emission spectroscopy (AES) for that purpose. The specific type of AES will be inductively coupled plasma-atomic emission ...

, as well as local ore smelters. Using laboratory-based Atomic Absorption Spectroscopy (AAS) and portable X J/cm2 Comparing Pb concentrations determined by Atomic Absorption Spectroscopy (AAS), X is shown below, along with the Pb emission line at 405.78 nm which was the ...

A real-life analytical assignment is presented to students, who had to examine an air conditioning coolant solution for metal contamination using an atomic absorption spectroscopy (AAS). This hands-on access to a real problem exposed the undergraduate students to the mechanism of AAS, and promoted participation in ...

A method for determining high concentrations of sodium by Atomic Absorption Spectroscopy (AAS) was developed. Parameter values were set and an interfering ion study completed. This technique utilizing sodium atomic absorption of zinc ion emission from zinc hollow cathode lamp allows analyses of solutions with ...

Flameless atomic absorption (AA) spectroscopy was explored as it was applied to the determination of trace metals in biological systems. A high conversion rate electronic integrator suitable for a variety of chemistry experiments was designed and fabricat...

A comparison study was carried out to evaluate the two most commonly used background correction techniques in furnace atomic absorption spectroscopy, the Zeeman effect and continuum source background correction. Synthetic sample matrices were prepared con...

Poly(acrylic acid) modified polyurethane (AA/PU) membranes were prepared by UV radiation without degassing. The chemical composition of the AA/PU membrane was studied by IR spectroscopy. In addition to those absorption peaks associated with pure PU, the absorption peak at 2400 cm-1 of ...

Non-science-major students at Columbia College-Chicago are introduced to the concept of ppm, prepare AAS standard solutions, digest foodstuffs in nitric acid, conduct AAS analysis for Ca, determine mass percentage of calcium in the sample, and check calcium levels in various food items on the Internet with a critical eye. Students work cooperatively in a ...

A method is presented for determining molybdenum in plant tissue and blood plasma by flame and flameless atomic absorption spectroscopy (AAS). The samples are digested with HNO3-HCIO4, and the metal is separated by chelation, extracted into methyl isobutyl ketone, and analyzed by AAS. Recoveries of molybdenum from ...

A method is presented for determining molybdenum in plant tissue and blood plasma by flame and flameless atomic absorption spectroscopy (AAS). The samples are digested with HNO/sub 3/-HClO/sub 4/, and the metal is separated by chelation, extracted into methyl isobutyl ketone, and analyzed by AAS. Recoveries of ...

A dual chamber furnace that has application to certain analytical problems in atomic absorption spectroscopy is described. The furnace was designed so that introduction of analyte vapors into the absorption region occurs in a more reproducible fashion than with conventional AA atomizers. The furnace acts like a ...

Interference caused by direct spectral overlap can be corrected by Zeeman Atomic Absorption Spectroscopy. Typical cases of interference of this kind appearing in the analysis of Sb were examined. Sb lines at 217.023 nm and 231.147 nm overlap the Pb absorption line at 216.999 nm and the Ni absorption line at 231.096 ...

Based on instructional experiences at Charles County Community College, Maryland, this report examines the pedagogical advantage of teaching atomic absorption (AA) spectroscopy with an AA spectrophotometer that is equipped with a microprocessor and video output mechanism. The report first discusses the growing ...

An atomic absorption spectroscopy (AAS) method for determining mercury levels in liquid samples to the parts per billion range was determined. The method is attractive because of the ease of application and the accuracy and precision of the results. Liquid samples may be analyzed that are as small as one milliliter. 6 references, 1 ...

by dilution of atomic absorption (AA) and inductively coupled plasma-atomic emission spectroscopy (ICP for a range of carbon species. Significant differences in the atomic emission signal from carbon were observed atomic emission signal on the analyte source. A physical model of the plasma- analyte interaction

... high resolution IR absorption spectroscopy in ... Descriptors : *HYDROGEN, *ABSORPTION, *SOLID ... PROPERTIES, INFRARED SPECTROSCOPY ...

This study is related to the application of the X-ray dual-energy microradiography technique together with the atomic absorption spectroscopy (AAS) for the detection of lead on Zea mays stem, ear, root, and leaf samples. To highlight the places with lead intake, the planar radiographs taken with monochromatic X-ray radiation in ...

of a factor of ~120. Multiple spectra show five broad absorption bands between 4100 AA and 6500 AA and a mostly featureless continuum longward of 6500 AA. The shape of the...

The determination of Cd in ambient air, associated with tobacco smoke, has been carried out by electrostatic precipitation of Cd directly in a graphite tube, which was subsequently used as an atomizer in electrothermal atomization atomic absorption spectroscopy (ET-AAS). It is shown that graphite tube permanently modified with Ir ...

Analytical methods for the determination of Fe, Al, Mn, Ca, Ni, Na, Sr, Cs, Ti, and Ba in simulated sludges and Synroc formulations are discussed. These are the elements that may be completed by atomic absorption spectroscopy, AAS. AAS methods are complicated by the dissolution methods used. These problems are ...

... AE) 6 b. Atomic Absorption Spectrophotometry (AA) 7 ... of both spectrometers. b. Atomic Absorption Spectrophotometry (AA) Trace ...

... Accession Number : ADA197710. Title : AAS (Atomic Absorption Spectrometry)-- Has it Gone or Where is it Going. Descriptive Note : Technical rept.,. ...

... Title : ULTRASONIC ABSORPTION SPECTROSCOPY IN FLUIDS BY OPTICAL DETECTION OF PHOTOACOUSTIC PULSE PROFILES. ...

TUNABLE DIODE LASER ABSORPTION SPECTROSCOPY VERIFICATION ANALYSIS FOR USE IN THE COMBUSTION OPTIMIZATION AND ...

... Accession Number : AD0422032. Title : THE USE OF INFRARED ABSORPTION SPECTROSCOPY IN RESEARCH ON HAFNIA AND ZIRCONIA. ...

... Accession Number : AD0606049. Title : ATOMIC ABSORPTION SPECTROSCOPY. Descriptive Note : Final rept. Corporate ...

... Accession Number : ADD752978. Title : AEROSOL ABSORPTION SPECTROSCOPY. Descriptive Note : CONFERENCE PAPER. ...

... Title : A STUDY OF OPTICAL ABSORPTION SPECTROSCOPY FROM METASTABLE EXCITED STATES OF TRANSITION METALS IONS IN ...

dithiocarbamate supported by polyurethane. The sorbed elements are subsequently eluted with 5 mol L-1 HNO3 for preconcentration of trace elements, viz., Cd, Cu, Mo, Pb, Te and Ni on a polyurethane foam support impregnated Medical Syringes (20 mL) were used as columns. The support was prepared from soft polyurethane foam

as a light source. Figure 1 shows the configuration of the laser-based system. An electro-optic EO phase for monitoring the laser frequency. It also provides an unshifted Doppler-broadened line shape reference process with the laser-based AA system, we measured the Doppler frequency shifts corresponding

A comparison study was carried out to evaluate the two most commonly used background correction techniques in furnace atomic absorption spectroscopy, the Zeeman effect and continuum source background correction. Synthetic sample matrices were prepared consisting of the most frequ...

The Langmuir-Blodgett (LB) films of Poly (N-vinylcarbazole) (PVK) Polymers and its hybrid films with arachidic acid (AA) and C60 were prepared by a vertical deposition method. Atomic Force Microscopy (AFM) and UV-Vis absorption spectroscopy were used to investigate the assembly of PVK/AA and ...

Atomic spectroscopy has played a major role in the development of our current database for mineral nutrients and toxicants in foods. When atomic absorption spectrometers became widely available in the 1960s, the development of atomic absorption spectroscopy (AAS) methods for accurately ...

... ATOMIC EMISSION SPECTROSCOPY; ATOMIC ABSORPTION ... SPECTROSCOPY; MOLECULAR FLUORESCENCE SPECTROSCOPY; X- ...

... STRUCTURE, SPECTROSCOPY, INFRARED SPECTROSCOPY, ABSORPTION SPECTRA, ULTRAVIOLET SPECTROSCOPY, CHEMICAL ...

... MOLECULAR SPECTROSCOPY, LASER INDUCED FLUORESCENCE, MOLECULAR ... ABSORPTION, ATOMIC SPECTROSCOPY, DISSOCIATION ...

An experiment has been developed for our undergraduate analytical chemistry course that demonstrates the indirect analysis of anionic surfactants by techniques normally associated with metal ion determination; that is, atomic absorption spectroscopy (AAS) and anodic stripping voltammetry (ASV). The method involves the formation of an ...

Tin is one of the more difficult elements to determine in environmental materials. Extremely low concentrations (nanograms per gram) in food products, plant and animal tissues, and aquatic samples coupled with the ubiquitous nature of this element and the ease with which laboratory reagents and vessels can become significant sources of contamination necessitate constant vigilance on the part of ...

In this article I explain why I wrote the set of teaching notes on Atomic Absorption Spectroscopy (AAS) and why they look the way they do. The notes were intended as a student reference to question, highlight and write over as much as they wish during an initial practical demonstration of the threshold concept being introduced, in this ...

In this paper, we compared atomic absorption spectroscopy (AAS), anodic stripping voltammetry (ASV), and UV-vis spectroscopy for the determination of the concentration of CdSe nanocrystal (NC) solutions. The experimental results were combined with crystallographic calculations of the NC size, which led to a very ...

A laboratory experiment is described that involves the elemental analysis of apples by inductively coupled plasma atomic emission spectroscopy (IICP AES). The results of the experiment allow students to predict the cold-storage stability of apples. During the experiment the sample-preparation techniques and digestion procedures involved in elemental analysis of solid organic ...

Current induced composition gradients were demonstrated in molten LiCl-KCl eutectic mixture, the electrolyte of a LiAl/LiCl-KCl/FeS/sub x/ battery. Analysis of composition profiles in quenched samples was by atomic absorption spectroscopy (AA), which gave good precision, and by x-ray fluorescence spectroscopy in a ...

Analytical procedures are described for the determination of arsenic, cadmium, calcium, copper, lead, mercury, selenium, and zinc in animal feed. Mercury is determined by digesting the feed sample in a mixture of concentrated nitric and sulfuric acids with vanadium pentoxide added as an oxidation catalyst, reducing with stannous chloride, and sweeping the elemental mercury into an ...

The analysis of elements of urinary stones can provide significant reference for the treatment and prevention of recurrence of urolithiasis. In the present paper, the application and research progress of element analysis of urinary stones by means of modern instruments were summarized. These techniques include X-ray photoelectron spectroscopy (XPS), proton induced X-ray ...

Atomic Absorption Spectroscopy is widely used in the petroleum industry for determination of the zinc concentration of new engine oils. Many of the methods in use rely on dilution of the sample with kerosene followed by aspiration into the AA. It has been shown that such methods are subject to matrix interferences from other additive ...

A comprehensive suite of spectroscopy have been used to study the composition and structure of Chromate Conversion Coatings (CCC) formed on Aluminum Copper (Al-Cu) alloy AA2024-T3 and constituent Intermetallic Compounds (IMCs). Based on previous work the CCC formed over the IMCs is expected to be thinner and therefore different in structure and composition ...

... Descriptors : *DIODE LASERS, *TUNABLE LASERS, *SPECTROSCOPY, *ABSORPTION SPECTRA, LASER DIAGNOSTICS, COMBUSTION ...

Upper atmosphere molecular oxygen concentrations measured by absorption spectroscopy, noting diurnal

vancements in Cavity Enhanced Laser Absorption Spectroscopy address all these concerns while offering exceptional sensitivity ...