Determination Of Aluminium Research Articles

Evaluation and Expression of Uncertainty in the Determination of Alumina in Deodorants Using Complexometric Method

Abstract Recent studies reveal that aluminum has several adverse effects on human life and causes several diseases. There are various sources by which aluminum can enter into a human body: The deodorant is one of them. In this paper, the concentration of alumina (%Al2O3) has been assessed for three different deodorants (namely, A, B, and C) using an indirect complexometric method along with an uncertainty budget. The uncertainty in the measurement has been evaluated and expressed according to the requirements of the standard ISO/IEC 17025:2005. It has been identified that the uncertainty in the measurement arises mainly from repeatability, standardization of zinc acetate, and volume measurement, which have been evaluated and combined according to the EURACHEM guidelines. The concentrations of alumina were 0.81±0.01, 0.73±0.01, and 0.49±0.01 g per 100 mL, respectively, for A, B, and C deodorants. The uncertainty in the measurement varies from 1.2 % to 2 % for the three deodorants. The results show that a person using A and B brand deodorants receives, respectively, 65 % and 48 % higher exposure to aluminum on the skin than a person using the C brand.

Deproteinization of blood serum by acid treatment and microwave irradiation for the determinationof aluminium by electrothermal atomicabsorption spectrometry

A method of deproteinizing serum was employed to reduce the protein concentration in the determination of aluminium by electrothermal atomic absorption spectrometry. The procedure combines the action of microwave irradiation with acids, at a concentration 10 times lower than that in the usual acid deproteinization methods, and promotes a protein reduction >99% with a small dilution factor (1+1). The best results with respect to aluminium determination were obtained with trichloroacetic acid at a concentration of 1.0%. Before the deproteinization procedure for recovery measurements, serum samples were submitted to an incubation treatment at 37 °C to bond aluminium ions to the proteins. The proposed method was compared with the usual deproteinization with acids for the separation of proteins, and for the determination of aluminium with direct injection of diluted serum samples into the graphite furnace. The regression for the correlation analysis of the proposed method and the direct determination of aluminium, applied to the analysis of 20 serum samples, indicated that the deproteinization procedure is efficient and generates comparable results. The reduction of the proteins allowed the use of a simple and fast graphite furnace heating programme for the analysis of serum samples without matrix interferences.

Comparison of the behaviour of glassy carbon and some metals for use as nonconsumable anodes in alumina-cryolite melts

Current interest exists in development of nonconsumable anodes for the Hall-Heroult process of aluminium production and also in situ analytical probes for determination of Al2O3 content in the cryolite melts used in this process. A comparison of the behaviour of glassy carbon and metals such as tungsten, tungsten carbide, nickel and stainless steel (SS-316) used as anodes in alumina-cryolite melts is investigated by means of electrochemical transient techniques (cyclic voltammetry and chronoamperometry) and Tafel anodic polarization experiments. The results show that only glassy carbon could be used as a successful sensor electrode for an in situ determination of Al203 in alumina-cryolite melts and that the metals investigated are unresistant to anodic attack in such melts. Consequently, the metals investigated cannot be used as sensor electrodes for in situ electro-analytical determination of alumina in alumina-cryolite melts, nor as anodes in the production of aluminium by the Hall-Heroult process.

Methods of analyzing refractories. Improving the determination of alumina in aluminosilicate raw materials on the BARS-3L instrument

On a developpe une methode d'analyse de l'alumine dans les argiles utilisees comme matieres premieres pour les refractaires aluminosiliceux

Simultaneous determination of silica and alumina in bulk bauxite samples by fast neutron activation

A prototype of a bulk bauxite analyzer based on fast neutron activation analysis has been developed for simultaneously determining the chemical concentrations of alumina and silica in both dried and undried bulk bauxite samples (about 3.5 kg). The determination of alumina is based on measuring the count rate in the 0.844 MeV ..gamma..-ray peak emitted by /sup 27/Mg formed in the activation of aluminum. The determination of silica is based on measuring the count rate in the 1.78 MeV ..gamma..-ray peak emitted by /sup 28/Al formed in the activation of silicon. The interference from alumina in the determination of silica was eliminated by measuring an additional parameter, the thermal neutrons underneath the bulk sample. The technique enables up to 10 analyses per hour with an accuracy (1 sigma) of 0.28% silica and 0.9% alumina. The samples analyzed contained 48 to 62% alumina and 2 to 11% silica. The tests indicated that the accuracy of analysis was similar for samples which had been oven-dried (0 to 5% free moisture) and samples which were taken from the benefication plant with free moisture varying in a narrow range (10 to 14% free moisture). The results also indicated that crushing and grinding of samplesmore » did not significantly improve the accuracy.« less

The determination of alumina in a copper matrix by atomic absorption spectrometry

The determination of alumina in a copper matrix by atomic absorption spectrometry

The determination of alumina in iron ores, slags and refractory materials by atomic-absorption spectroscopy

As chemical methods of determining alumina are time-consuming, the simpler, more rapid atomic-absorption technique was adapted to iron ores, slags and refractory materials.The basic technique comprises fusion of the sample with a sodium tetraborate-sodium carbonate mixture, extraction with dilute nitric acid, appropriate dilution and spraying under recommended conditions for aluminium. As the flux materials enhance the aluminium absorption, sample and corresponding calibration solutions should contain equivalent amounts.Interference tests on synthetic solutions of the other constituents showed that the inhibiting effect of silica was suppressed by lanthanum chloride. A standard addition of lanthanum chloride was therefore incorporated and calibration conditions were developed to cover the ranges 0 to 1 per cent., 0 to 5 per cent., 0 to 10 per cent. and 10 to 35 per cent. of aluminium.Applications to miscellaneous B.C.S. materials showed good agreement with accepted values and reproducibilities of ±0·035 per cent., ±0·12 per cent., ±0·18 per cent. and ±0·38 per cent. of aluminium, respectively, at the above levels.

Determination of alumina in sintered aluminium powder by activation with 14-MeV neutrons

Fast neutrons of 14 MeV produced in the IMICAM CISE 150-kV generator by the (d, t) reaction in a tritium-titanium target, were used in the indirect determination of Al(2)O(3). The samples were irradiated for 30 sec and the total (16)N activity was determined, by counting for ten 2-sec periods and graphically integrating. The standards were a known sintered aluminium powder and nylon pieces of identical shape. The method is competitive with the chemical one, because of its quickness, sensitivity and precision.

Micro-analysis of silicate rocks. Part V. Spectrophotometric determination of alumina

Alumina is determined spectrophotometrically as the 8-hydroxy-quinolinate after ligand exchange in the organic phase with aluminium acetylacetonate extracted into benzene from aqueous medium at pH 6 to 7. Interfering elements such as iron, titanium, vanadium and zirconium are removed by extraction into o-dichlorobenzene from M hydrochloric acid, but beryllium is not removed by this procedure.

Study on the determination of alumina in aluminium (M. T. Method)

It has been reported by Mr. M. Taurnaire on the analytical method of alumina in aluminium by means of separating alumina from aluminium with dilute hydrochloric acid solution.This method is quite simple in operation and can easily applied to the routine analysis work in plants. But, it is considered that the accuracy in this method is not very good because alumina is solved into dilute hydrochloric acid, though slightly.In this connection, the authors have investigated on the solubility of alumina when treated with dilute hydrochloric acid solution by the M. T. method, and on how to opperate the analysis in this method.The findings are summed up as follows:1. The solubility of alumina in dilute hydrochloric acid solution.(1) The solubility of alumina in dilute hydrochloric acid solution decreases with the increase in calcination temperature of alumina.(2) The solubility of alumina increases with the increase in the concentration of hydrochloric acid.(3) The solubility of alumina increases slightly with the increase in standing time after the addition of hydrochloric acid.(4) The temperature of solution is very important. The solubility of alumina increases as the temperature of solution is raised within the range of room temperature. It is especially increased when the temperature of solution is raised to about 40°C. To keep the accuracy of this method, therefore, it must be essential to keep the temperature of solution below room temperature.(5) Amounts of alumina and volume of solution have no effect on the solubility of alumina.2. Others(1) The surface oxide of sample should be removed by use of sodium hydroxide solution and dilute nitric acid solution.(2) For washing out the solution of absorbed aluminium from filter paper, 0.1 N hydrochloric acid and hot water are suitable.(3) In the process of hydrofluoric acid-sulfuric acid treatment, metallic silicon, if present, can be volatized by the addition of few drops of nitric acid.

Complexometric determination of alumina in high-alumina materials

Complexometric determination of alumina in high-alumina materials

The polarographic determination of aluminium : The elimination of interfering elements and the determination ofaluminium by oscillographic polarography

A study is reported of the effect of some ion species on the determination of aluminium by osicillographic polarography under the conditions. previously established. The development of an electrolytic procedure for the removal of interfering metal ions is described and details of unsuccessful attempts to remove interference by fluoride are given. The method for the determination of aluminium is given in detail and result obtained with it are presented.

The determination of alumina in silicates (Rocks and Refractories)

New procedures have been developed for determining the alumina contents of silicate material (rocks and refractories). The material is first taken into solution by a peroxide sinter technique, followed by dissolving the sinter in warm water and the addition of sufficient hydrochloric acid to render the solution acid to litmus. A different technique is used for silicates containing less than 5% alumina. The majority of the silica is first removed by treating with hydrofluoric-sulphuric acids and the residue is fused with potassium bisulphate. Extractions with cupferron are next employed to remove iron, titanium, zirconium etc., and the aluminium is subsequently separated from other sample constituents by precipitating as its insoluble benzoate. After filtration the aluminium benzoate is dissolved in hydrochloric acid and the aluminium concentration determined volumetrically with ethylenediaminetetraacetic acid.

Micro-analysis of silicate rocks. Part IV. The determination of alumina

Micro-analysis of silicate rocks. Part IV. The determination of alumina

Determination of Alumina in Steel

Determination of Alumina in Steel

Additions and Corrections - Determination of Alumina in Iron Ore

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdditions and Corrections - Determination of Alumina in Iron OreG. F. Smith and F. W. Cagle, Jr.Cite this: Anal. Chem. 1948, 20, 12, 1237Publication Date (Print):December 1, 1948Publication History Published online8 October 2003Published inissue 1 December 1948https://doi.org/10.1021/ac60024a603RIGHTS & PERMISSIONSArticle Views19Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (908 KB) Get e-Alerts Get e-Alerts

Determination of Alumina in Iron Ore

Determination of Alumina in Iron Ore

Determination of Alumina in Chrome Ore and Chrome-Magnesite Refractories

(1946). Determination of Alumina in Chrome Ore and Chrome-Magnesite Refractories. Transactions of the Indian Ceramic Society: Vol. 5, No. 3, pp. 101-103.

Determination of alumina and silica in steel by the hydrochloric acid residue method

Determination of alumina and silica in steel by the hydrochloric acid residue method