... study was made of spectrophotometric methods for determination of tantalum and ... Absorption spectra studies were made of compounds of ...
DTIC Science & Technology
... Abstract : An absorption maximum was observed at ... samples by a spectrophotometric method, which ... in the quantitative determination of ...
Spectrophotometric studies were made of plutonyl nitrate complex formation in acetone. The compositions of the complexes and their evolution were determined. The absorption spectra of a complex trinitratoplutonyl compound had complex characteristics and differed considerably from perchlorate and plutonyl nitrate spectra. ...
Energy Citations Database
... Title : SPECTROPHOTOMETRIC INVESTIGATION OF REACTION OF ... of the absorption spectrum. ... are convenient for determination of niobium in ...
... Title : SPECTROPHOTOMETRIC DETERMINATION OF NITRITE ESTERS AND SALTS IN ... The absorption of visible light at 400 millimicrons by the ...
... Given is also an evaluation of possibilities of the spectrophotometric method in determination of metals by the magnitude of light absorption of their ...
... maintenance of performance in air- dase also has a weak absorption band in the near infrared ... manuscnipt was iccepted flr publication ir June 1987 ...
A new spectrophotometric method for the determination of micro nickel p-acetyl arsenazo was studied. The maximum absorption of the Ni-p-acetyl-arsenazo complex was observed at 640 nm with the molar absorptivity of 6.03 x 10(4) L.ml-1.cm-1. The nickel content within 0-0.8 mg/L followed the Beer's Law. PMID:12725094
PubMed
A simple, rapid and reliable method for the determination of lead in hair and teeth samples has been described. The method incorporates digestion of the samples by nitric acid followed by atomic absorption spectrophotometric determination of lead using 283.3 nm wavelength. PMID:6746188
>A spectrophotometric determination of beryllium using beryllon II was studied. It was recognized that beryllium formed a blue water-soluble chelate compound with beryllon II under a basic condition and had a maximum absorption at 620 m mu . Absorbance followed Beer's law at the range of 0.02 to 0.5 ppm of ...
Solvent extraction spectrophotometric and atomic absorption spectrophotometric methods for the determination of selenium(IV) in microgram quantities are described. The selenium(IV) forms yellow colored complex with N-phenylbenzohydroxamic acid (PBHA) extractable into chloroform from 7 M HClO/sub 4/. Se-PBHA complex has maximum ...
The following are reported: spectroscopic studies of selected actinides in molten dimethyl sulfone; absorption spectrophotometric study of actinide halides under pressure; spectroscopic investigations of americium (V) and (VI) in concentrated aqueous carb...
National Technical Information Service (NTIS)
... Title : Spectrophotometric Studies of Iodine Complexes in an Aluminum Chloride - Butylpyridinium Chloride Ionic Liquid. ...
A comparative study was made of the absorption spectra of colored peroxide Ce complexes in pure solutions and in the presence of other rare earths and Mg. The spectrum regions are shown where optical density should be measured when Ce is determined by the peroxide method. (auth)
The distribution of selected trace metals in airborne dust from local atmosphere was studied using the atomic absorption spectrophotometric method. The metals included in the study were: Pb, Ni, Fe, Zn, Mn, Cr, Cd and Cu. Total suspended particulate matte...
A comparison between spectrophotometric and gravimetric methods to study MWD of asphalt is presented. Spectrophotometry suffers from not detecting saturated compounds, as well as from variation of molar absorptivity during analysis. To address these shortcoming, the whole asphalt sample is fractionated, and the relative molar ...
Triaminotriphenylamine was used as a new spectrophotometric reagent for the determination of sulfur dioxide and nitrogen dioxide in the atmosphere. The absorption maxima of SO/sub 2/ and NO/sub 2/ compounds differ from that of the reagent. Based on a kinetic study, the experimental conditions for the determination of sulfur dioxide in ...
A simultaneous determination of olmesartan medoxomil and hydrochlorothiazide by absorption ratio spectrophotometric method has been developed in combined tablet dosage form. The method is based on measurements of absorbance at isoabsoptive point. The Beer's law obeys in the range of 10-30 mug/ml for both olmesartan medoxomil and hydrochlorothiazide ...
In studies of the highly sensitive reactions between some polyvalent metal ions, chromeazurol S and cetyltrimethylammonium bromide, it was found that thorium also forms a pure blue complex in aqueous solution. An investigation of the properties of this ternary, water-soluble thorium complex is being made because of its very high molar absorptivity ...
A simultaneous determination of olmesartan medoxomil and hydrochlorothiazide by absorption ratio spectrophotometric method has been developed in combined tablet dosage form. The method is based on measurements of absorbance at isoabsoptive point. The Beer's law obeys in the range of 10�30 ?g/ml for both olmesartan medoxomil and hydrochlorothiazide ...
PubMed Central
Absorption spectra for Nb--Ta alloys were studied, and interfering effects of various elements in spectrophotometric determinations were analyzed. It is shown that rhodonide extraction method is best for Nb, while methyl violet is best for Ta. (R.V.J.)
The absorption spectra of niobium in hydrochloric acid solutions were studied in the presence of tartaric acid and small amounts of sulfate ions. The influence of accompanying elements on the determination of niobium in a hydrochloric medium by a differential spectrophotometric method is given. A differential method was ...
Plutonium ions in solution have absorption spectra so different that it is possible to use them for analytical purposes. Detailed studies have been performed in nitric solutions. Some very convenient methods for the determination of plutonium and its oxid...
Topics covered in this report include atomic absorption analysis of arsenic in animal tissues and meat products; standards for atomic absorption spectrophotometric methods; preparation of high purity standard solutions for Biological Reference Materials; studies on cadmium and lead in earthenware; emission ...
... VAPOR PRESSURE OF ATOMIC SPECIES FROM SPECTROPHOTOMETRIC MEASUREMENTS OF THE ABSORPTION OF RESONANCE LINES. ...
... Abstract : Evaluation of a spectrophotometric procedure for ... The specific absorption wavelength of the ... a means of quantitative determination of the ...
NASW-2522. SPECTROPHOTOMETRIC STUDY OF ASTEROIDS. Final Report. August, 1974. I( NASA-CR-140511) SPECTROPHOTOMETRIC STUDY. N74-35240 ...
NASA Website
This paper describes the possibility of direct determination of scandium in aluminum alloys with a high titanium content. It is shown that when sodium molybdate is introduced into solutions containing titanium (IV) ions and arsenazo III, there is an increase in the value of the light absorption and a long-wave shift of the absorption band. Also ...
Solvent extraction, spectrophotometric and atomic absorption spectrophotometric determination of tellurium-(IV) in nanogram levels are described. The tellurium(IV) forms yellow colored complex with N-phenylbenzohydroxamic acid (PBHA) which is extractable into chloroform from 7 M HClO/sub 4/. Te-PBHA complex has a maximum absorbance at ...
Galangin (3,5,7-trihydroxyflavone) forms an intense yellow-colored complex wlth thorium ions. The color reaction was investigated for spectrophotometric determination of thorium. The complex shows maximum absorption at 410 m at pH 2.2. The region of maximum absorption shifts slightiy toward the higher wave lengths with ...
... cj~ I-- SPECTROPHOTOMETRIC DETERMINATION Cr� ... and r-naphthylamine akve been determined from their aiiUav'e�st uV absorption spectra in ...
Electron donor-acceptor (EDA) complexes of tri-n-octylamine (TOA) with [60]- and [70]fullerenes and some other electron acceptors have been studied in chloroform medium by absorption spectrophotometric technique. Charge transfer (CT) absorption bands are observed in the visible region. Vertical ionization potential ...
A collaborative study to determine the accuracy and precision of flame atomic absorption spectrophotometric determination of lead, cadmium, zinc, and copper in clams and oysters is detailed. Samples containing levels of lead and cadmium too low to be measured by direct atomic absorption spectrophotometry were first ...
A spectrophotometric study of the uranium(VI)-3-acetyl4-hydroxycoumarin complex was made in about 95% ethanol. The complex was found to have a molar composition of 1: 1 and obeys Lambert-Beer's law at 380 m mu in the range of 0 to 57.0 ppm of uranium. The presence of a hydrogen bonded system in the molecule was confirmed by the infrared ...
Stable solid complexes were isolated and are shown to have the same formulas as metal complexes previously synergistically extracted from aqueous solution by an organic phase containing thenoyl trifluoroacetone (HTTA) and neutral organophosphorus compounds. The formulas were confirmed by uv and visible absorption spectrophotometric measurements of ...
The solid-state absorption spectra of Cf(III) ions as a dopant in lanthanide trihalide hosts (LnCl sub 3 : Ln = Ce, Sm, and Y; LnBr sub 3 : Ln = Ce, Sm, Tb, and Y; LnI sub 3 : Ln = Ce and Y) have been recorded. The spectra of Cf(III) have been correlated ...
A spectrophotometric method for the determination of ozone dissolved in aqueous solution is described. Principle of the method is based on the absorption of ozone in alkaline potassium iodide solution. Iodine is released upon acidification and the chromophoric properties quantitated at the maximum absorption peak in the visible ...
A hydride generator was used with the described atomic absorption spectrophotometric method to determine the arsenic and selenium in sewer effluent. For analysis, the optimum concentration of hydrochloric acid was found to be 0.9N for arsenic and 3N for selenium. Studies were also conducted on the time required to collect the generated ...
A method is described for the determination of cobalt in foods. After wet digestion, iron in the sample is removed by liquid-liquid extraction, and cobalt is isolated and extracted. Final determination is done by flame atomic absorption spectrophotometry. Analysis of NBS reference materials by this procedure gives results in close agreement with certified values. The limit of ...
A previously reported method for the determination of chromium in plants and biological materials has been simplified. The method, which involves wet digestion, isolation and concentration of chromium by liquid-liquid extraction, and final determination by atomic absorption spectrophotometry, is sensitive to about 20 ng chromium. Recovery studies and ...
A simple, sensitive, rapid, accurate and precise spectrophotometric method has been developed for the estimation of bicalutamide in bulk and pharmaceutical dosage forms. Bicalutamide shows maximum absorbance at 272 nm with molar absorptivity of 2.3399�10(4) l/mol/cm. Beer's law was obeyed in the concentration range of 1.5-18 ?g/ml. The limit of detection ...
A method is described for the spectrophotometric determin%tion of 20 to 100 mu g of a rare earth element using xylenol orange. The complexes of Ce(III), La(III), Nd(III), and Y(III) with xylenol orange have an absorption maximum at 575 to 578 m mu vs the reagent blank. Each of them is a 1: 1 complex and has a formation constant of approximately ...
A rapid, simple, sensitive and selective spectrophotometric determination of nitrite using new diazotizing and coupling reagents is described. The method is based on a diazotization-coupling reaction between dapsone and iminodibenzyl in a hydrochloric acid medium. The molar absorptivity and Sandell's sensitivity were found to be 7.5 x 10(4) l mol(-1) ...
A spectrophotometric study of the reaction between thorium ion and beta -hydronaphthazarin disulfonate (dipotussium 1,2,3,4-tetrahydro-5,8-dihydroxy-1,4- diketonaphthalene-2,6-disulfonic acid) in aqueous solution showed that two water- soluble complexes were formed, a green complex with a metal to ligand ratio of 1: 1 and a blue complex with a ...
Annual progress report for the period July 1972 through June Difficulty in the atomic absorption spectrophotometric determination of mercury in the test materials for the /sup 252/Cf evaluation program was traced to the presence of mercury(I) in the solutions for analysis. (auth)
The determination of wear metals in certain used automobile engine oil and aircraft engine oil by the atomic absorption spectrophotometric method is described. Preparation of synthetic metal naphthanates for calibration is described.The procedures develop...
... obtained by the spectrophotometric method agree ... for the determination of binding ... EQUILIBRIUM(PHYSIOLOGY), ABSORPTION, SERUM ALBUMIN ...
... the accuracy in the determination of the ... coefficient, k, around the absorption edge, it ... results obtained from the spectrophotometric and ellipsometric ...
