... Interlaboratory Trial: Graphite Furnace Atomic Absorption Spectrometric Determination of Lead and cadmium Extracted from Ceramic Foodware ...

...million as determined by analytical method entitled �Atomic Absorption Spectrometric Determination of Sub-part-per-Million Quantities...as determined by an analytical method entitled �Atomic Absorption Spectrophotometric Determination of...

Cold Vapor Atomic Absorption Spectrometric Determination of Total Mercury in Seafood Using Microwave Assisted Digestion: Appendix B - Supplemental Information ...

It is demonstrated that the use of the sample suspension technique and the secondary solid standard result in improvements in the analysis of airborne particulates. (AIP)

Atomic-absorption spectrometric methods are described for the determination of metals and silicon in a fly-ash which is produced during oil recovery from Alberta tar sands. The techniques of standard additions and matrix matching are compared. An experimental design for the detection, estimation and correction of interference effects ...

... Elemental Analysis Manual: Section 4.1 Flame Atomic Absorption Spectrometric Determination of Lead and Cadmium Extracted from Ceramic Foodware. ... Lead, Pb, �, 1.0. ...

By means of a wet chemical dissolution step, a flame atomic absorption spectrometric measurement, and an analytical curve or standard addition standardization process, lead in food wrappers can be measured. A dry ashing digestion step results in low lead ...

... Title : MASS SPECTROMETRIC DETERMINATION OF THE CHEMICAL COMPOSITION OF GASES EVOLVED FROM RECONNAISANCE ...

Fifteen new hydroxamic acids were explored in conjunction with trioctylmethylammonium cation for the extractive separation of manganese into MIBK from the anions and cations commonly associated with the metal in environmental samples. The most rapid extraction with the maximum selectivity and sensitivity for the atomic absorption spectrometric ...

The paper briefly reviews the status of titanium as an environmental pollutant and presents a new method suitable for the microdetermination of the metals in plants, animal tissues and waters. The method is based on extractive separation of titanium as its chelate with N-p-methoxyphenyl-2-furylacrylohydroxamic acid (MFHA) in chloroform or isoamyl alcohol and subsequent spectrophotometric or atomic ...

The World Health Organization (WHO) European and International Standards for Drinking Water, and the EC Directives concerning the quality of water intended for the abstraction of drinking water and the quality of water for human consumption, all recommend...

Potentiometric and atomic absorption spectrometric (AAS) methods are described for the determination of various sulfonamides in tablets, suspensions, and injections, based on reactions with silver and copper ions. The methods involve direct titration at pH 8, using either a graphite electrode in which silver and copper sulfides have ...

A novel atomic absorption spectrometric method and two highly sensitive spectrophotometric methods were developed for the determination of paracetamol. These techniques based on the oxidation of paracetamol by iron (III) (method I); oxidation of p-aminophenol after the hydrolysis of paracetamol (method II). Iron (II) then reacts with ...

A simple, rapid and sensitive combined solvent extraction and atomic-absorption spectrometric method has been developed for the determination of tellurium in copper, lead, selenium and blister copper. Tellurium is extracted as the trioctylmethylammonium-tellurium(IV) bromide complex into butyl acetate and ...

A molybdenum and lanthanum treated pyrolytically coated graphite tube is employed for the furnace atomic absorption spectrometric determination of lead and cadmium directly in nitric-perchloric acid tissue digests. Lanthanum tends to promote the formation of a smooth lead atomiza...

The further application of acid hydrolysis as a preparative procedure for orange juice is described. The hydrolysate is a useful matrix for the flame atomic absorption determination of eight metals, Ca, Cu, Fe, K, Mg, Mn, Na, and Zn. Precision studies are...

A Tm/sup 170/ source was used in the x-ray spectrometric determining yttrium by K-edge absorption. The analysis does not depend on the content of the specimen and can be carried out in relatively thick layers. The order of accuracy is 4%. (tr-auth)

... on the gas chromatographic mass spectrometric determination of nerve ... Identification of chemicals related to the chemical weapons convention ...

... Title : Mass Spectrometric Determination of Chemical Warfare Agents in Indoor Sample Media Typically Collected During Forensic Investigations. ...

... continuing correlation programs are essential to the management and control of the laboratories engaged in the spectrometric oil analysis programs ...

Arsenite - but not arsenate, methylarsonic acid, or dimethylarsinic acid - is extracted from water samples by 5 mL of a 0.01M hexane solution of sec-dibutylthiophosphate. A 10 microliters aliquot of the extract is injected into an atomic absorption spectrometer with a graphic fur...

... Title : Method for the Particle Size Independent Spectrometric Determination of Metal Particles in Lubricating Oils and Hydraulic Fluids. ...

... Title : A Method for the Particle Size Independent Spectrometric Determination of Metal Particles in Lubricating Oils and Hydraulic Fluids. ...

Analyses of very complex samples involving capillary and chip electrophoresis often require dual (multiple) detection to attain sufficient selectivity of determination. The present work reviews and critically evaluates selected combinations of electrochemical detection techniques among themselves and with absorption spectrometric, ...

A simple and reliable method based upon impregnation of Cyanex302 on octadecyl bonded silica membrane disk has been developed for separation and atomic absorption spectrometric determination of nickel. The influence of various parameters like aqueous phase pH, flow rate and volume of eluent were investigated systematically to optimize ...

A dry ashing, flameless atomic absorption spectrometric method was evaluated to determine arsenic and selenium in foods. Samples were dry-ashed with Mg(NO3)2-MgO and dissolved in HCl. Selenate was reduced to selenite by boiling in 4N HCl. Selenate was reduced to selenite by boiling in 4N HCl, and arsenate to arsenite by treatment with ...

The EPA protocols for SW-846 Methods 7470 and 7471 are cold-vapor atomic absorption spectrometric (CV-AAS) methods for the determination of mercury in aqueous and solid environmental samples. In continuation of a previous single-laboratory study in which a revised more sensitive ...

In the present study IR spectrometric analysis was used to determine clear research octane number, heat of formation, specific gravity and mole fraction of methyl group, simultaneously in hydrocarbon mixtures. IR absorption spectrum can be used to provide information, that can be obtained by several existing test methods.

The structure of a modified uridine derivative which was detected at the first letter position of the anticodon of Bacillus subtilis tRNA1Lys was determined to be 5-(carboxymethylaminomethyl)-2-thiouridine. The determination was mainly based in this ultraviolet absorption spectra and mass spectrometric analysis of ...

A simple and sensitive combined solvent-extraction and atomic-absorption spectrometric method has been developed for the determination of gold in silver, copper, lead, selenium and anode slime. Samples are decomposed with hydrochloric and nitric acids, and gold is extracted as the trioctylmethylammonium-gold bromide complex and ...

An atomic absorption (AA) spectrometric method is described for the determination of the total lead content of gasoline regardless of the lead alkyl type. The gasoline sample is diluted with methyl isobutyl ketone, and the alkyl lead compounds are stabilized by reaction with iodine and a quaternary ammonium salt. The lead is ...

A method for the determination of arsenic in whole human blood is presented. To decrease the matrix effects from this complex sample, the blood was prediluted with a matrix modifier solution. The modifier solution contained a surfactant, Triton X-100, which homogenized the sample and allowed accurate pipetting by an autosampler. The modifier also contained nickel nitrate which ...

A discrete sample nebulization technique was employed to determine trace metals in nuclear grade zirconium and Zircaloy by flame atomic-absorption spectrometry. With 10% (w v ) sample solutions, detection limits for Cd, Cu, Mn, Ni, and Pb were 0.6, 2, 1,3, and 10 mug g . Micro standard-addition procedures and background correction were employed to minimize ...

The measurement of the absolute activity or the mass of radioactive substances by gamma spectrometry needs to include a correction for the radiation absorption inside the source volume, the so-called self-absorption factor. It depends on geometry and material composition of the source, the detector geometry and on the geometrical arrangement of source and ...

Two sensitive spectrophotometric and atomic absorption spectrometric procedures are developed for the determination of certain cephalosporins (cefotaxime sodium and cefuroxime sodium). The spectrophotometric methods are based on the charge-transfer complex formation between these drugs as n-donors and 7,7,8,8-tetracyanoquinodimethane ...

This report describes a method which has been employed using phenolate ion absorption at 291 nm for the measurement of phenols in water. The monohydric phenols measured are among those abundant in coal gasification by-products. The errors obtained in employing an average proportionality constant for the calculation of concentrations of individual phenols are discussed. Using ...

The relationships between differential and integral cross sections are considered together with their application to the calculation of reaction rates in reactor spectra. A brief review of the measurement of these quantities is given in order to show the importance of chemical analysis in all methods. Particular attention is devoted to the determination of integral ...

This article reviews numerous analytical techniques for determining trace amounts of selenium in body fluids. In addition, sampling storage and treatment procedures are evaluated. The analytical techniques reviewed include the following: spectrofluorometry and spectrophotometry; atomic absorption spectrometry; fluorescence and atomic emission spectroscopy; ...

Provides procedures to measure the calcium concentration in fruit juice by atomic absorption. Fruit juice is used because: (1) it is an important consumer product; (2) large samples are available; and (3) calcium exists in fruit juice at concentrations that do not require excessive dilution or preconcentration prior to measurement. (JN)

An x-ray absorption spectrometric technique is described. A preliminary experiment to observe emission lines from a wide range of targets was attempted. (DLC)

An x-ray absorption spectrometric technique is described. A preliminary experiment to observe emission lines from a wide range of targets was attempted. (ERA citation 11:016775)

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

Ultraviolet-polarization absorption spectra and theoretical models were used to determine the band structure of single crystal four- and five-valence molybdenum and tungsten octacyano complexes in the spectral region 10 to 50 kK. A special developed micro...

The authors report on the room-temperature characterization of a narrow absorption signature in an organic molecular solid (?-lactose monohydrate) centered around 530 GHz and having a full width at half maximum as small as 23 GHz. Three different spectrometric techniques were applied, two of them (tunable photomixing and tunable frequency multiplication) ...

Ionic alkyllead compounds are extracted from water samples into pentane by complexation with sodium diethyldithiocarbamate. Inorganic lead is complexed with EDTA. The organic phase is evaporated to dryness by vacuum distillation, after which butylation with n-butyl Grignard reagent is carried out in a microvolume of n-nonane. The analysis is performed by gas chromatography with atomic ...

A scheme for selecting resonant frequencies for the analysis of gaseous air pollutants using long-path absorption of narrow-band infrared sources is presented. A computer search is conducted using existing spectrometric data to determine lines with minimum interference and maximum sensitivity. Results are given for the pollutants O/sub ...

Cadmium determination in soils that contain arsenic may be subject to interference. When this problem is not appreciated spurious results may be accepted as correct. Spectrometric methods for the quantitative determination of cadmium in the presence of arsenic were compared. Data are given for each method to demonstrate the problem of ...

Collinear dual beam thermal lens spectrometric (TLS) detection, combined with flow injection analysis (FIA), was developed and applied to determine simultaneously concentrations of ionic and colloidal silver in the Russian drinking water supplies of the International Space Station (ISS). The newly developed method is based on on-line generation of silver ...

A method is disclosed for determining the concentration of trivalent chromium Cr(III) in a sample. The addition of perchloric acid has been found to increase the atomic chromium spectrometric signal due to Cr(III), while leaving the signal due to hexavalent chromium Cr(VI) unchanged. This enables determination of the Cr(III) ...

Spectrometric studies on the complexation of zirconium IV (Zr(IV)) with five new pyrazolonic derivatives were carried out. The influence of ortho-substituted groups on the operational parameters of the spectrometric method of determining Zr(IV) was investigated. The absorption spectra revealed that the wavelengths ...

This review focuses on the determination of uranium using spectroanalytical techniques that are aimed at total determination such as flame atomic absorption spectrometry (FAAS), electrothermal atomic absorption spectrometry (ETAAS), inductively coupled plasma optical emission spectrometry (ICP-OES); and inductively ...