Simultaneous Determination Of Aluminium Research Articles

Spectrophotometric Determination of Fe(II) and Fe(III) Using 5-(4-Ethylphenyl azo ) 2-Hydroxybenzaldehyde Oxime Reagent

Spectrophotometric Determination of Fe(II) and Fe(III) Using 5-(4-Ethylphenyl azo ) 2-Hydroxybenzaldehyde Oxime Reagent

Evaluation of Multi-Mixtures of Acids for the Sample Preparation of Organic Soil Amendments for Multi-Element Determination by ICP OES

ABSTRACTA method for the simultaneous determination of aluminum (Al), arsenic (As), calcium (Ca), cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), magnesium (Mg), manganese (Mn), phosphorus (P), lead (Pb), sulfur (S), selenium (Se), vanadium (V), and zinc (Zn) in organic soil amendments using microwave-assisted acid digestion and inductively coupled plasma optical emission spectroscopy (ICP OES) is proposed. Concentrated or diluted acids mixtures (HNO3, HF, HBF4, and H3BO3) combined or not with H2O2 were systematically evaluated in order to achieve the best digestion procedure for masses of around 150 mg of samples. Principal component analysis (PCA) was applied in order to choose the best acid mixture for digestion (3 mL HNO3 + 1 mL HBF4 + 2 mL H2O). The determined concentrations were in accordance with certified values of CRM 029 at the 95% confidence level, according to the Student-t test. This acid mixture was successfully applied for the digestion of four organic soil amendment samples (organic fertilizers, substrates, and soil conditioners) and element determination.

2, 2'-ジヒドロキシァゾベンゼンを用いる吸光検出-イオン対逆相分配高速液体クロマトグラフィによる血清アルミニウムと鉄の同時測定法

2, 2'-ジヒドロキシァゾベンゼンを用いる吸光検出-イオン対逆相分配高速液体クロマトグラフィによる血清アルミニウムと鉄の同時測定法

Simultaneous determination of aluminium, aluminium fluoride complexes and iron in groundwater samples by new HPLC–UVVIS method

The paper presents the application of the new HPLC–UVVIS method used in speciation analysis of aluminium form Al3+, aluminium complexes with fluorides and iron in groundwater samples. Based on the obtained results of groundwater samples analysis, the separation of iron in the retention time ≈3.7, was obtained. The conditions of the occurrence of particular aluminium forms based on the speciation analysis and modeling in the Mineql program were presented and confirmed. The influence of pH and ligand concentration on forming complexes was shown. The preliminary study of aluminium complexes with sulfates based on model solutions did not allow for the separation of the above complexes in presented analytical system. The paper presents the possible types of transformation of aluminium hydroxy forms and aluminium sulfate complexes by the reaction of the sample with mobile phase. An indirect method for the determination of aluminium in the form of aluminium sulfate was proposed. The new method was successfully applied in the determination of the following aluminium forms: Al3+, AlF2+, AlF30, AlF4−, AlF2+ and Fe3+.

Simultaneous determination of aluminum, copper, iron and zinc in Oscillatoria, Juncus littoralis tissues and wetland water samples by ultrasound-assisted emulsification-microextraction combined with ICP-OES

Ultrasound-assisted emulsification microextraction (USAEME) followed by inductively coupled plasma-optical emission spectrometry (ICP-OES) for simultaneous extraction, preconcentration and determination of trace levels of aluminum, copper, iron and zinc in Oscillatoria, Juncus littoralis tissues and wetland water samples is presented. Sodium diethyldithiocarbamate trihydrate (Na-DDTC·3H2O) was used as a chelating agent and tetrachloroethylene was selected as an extraction solvent. The effective parameters of the USAEME method including volume of extraction solvent, ultrasonic time, salt concentration, temperature, concentration of ligand and pH were investigated by a fractional factorial design. The results showed that temperature had no considerable effect on the efficiency. A Box-Behnken design (BBD) was applied to optimize the effective parameters. The optimal conditions were obtained as 48 μL for volume of extraction solvent, 6 min for ultrasonic time, 16.6 (w/v %) for salt concentration, 1440 mg L−1 for concentration of the ligand and 7 for pH. The linear dynamic range (LDR) was 1–1000 μg L−1 with determination coefficient of 0.994–0.998. The limits of detection (LODs) and relative standard deviations (RSDs) were 0.64–0.91 μg L−1 and 2.6–5.3%, respectively. The method was successfully applied to the determination of Al, Cu, Fe and Zn in real environmental samples and satisfactory relative recoveries (92–99%) were obtained.

Facile Spectrophotometric Determination of Aluminum(III) and Copper(II) Simultaneously with Alizarin Yellow R in Aluminum-Copper Alloys

A facile, highly sensitive, and selective spectrophotometric method has been developed for the determination of aluminum and copper in different alloys. The method is based on the formation of the binary complexes of aluminum and copper with Alizarin yellow R (AYR) [5-(4-nitrophenylazo) salicylic acid] at pH 2.0 and 6.2, respectively, at wavelengths 422 and 445 nm with molar absorbtivity 1.1 × 104 l mol−1 cm−1 for each one. Aluminum and copper were thus determined in the ranges 0.4–2.0 μg ml−1 and 1.9–3.6 μg ml−1, respectively, in the presence of one to another. The detection limits were found to be 1.4 ng ml−1 of aluminum and 0.015 μg ml−1 for copper. The relative standard deviations were in all instances less than 1.3%. The proposed method was successfully applied for the simultaneous determination of aluminum and copper in certified reference aluminum-copper alloys.

Simultaneous determination of aluminum (III) and iron (III) by first-derivative spectrophotometry in alloys

A highly sensitive and selective first-derivative spectrophotometric method has been developed for the determination of aluminum and iron in mixtures. The method is based on the formation of the binary complexes of aluminum and iron with Alizarin yellow R (AYR) 5-[4-nitrophenylazo]salicylic acid at pH 2.0 with molar absorptivity of 1.1∙104 l⋅mol–1⋅cm–1. A zero-crossing technique is found suitable for the direct measurement of the first derivative value at the specified wavelength, so aluminum and iron were thus determined in the ranges 1.3–5.4 μg/ml and 1.1–8.3 μg/ml, respectively, in the presence of both components. The detection limits were found to be 1.4 ng/ml for aluminum and 2.8 ng/ml for iron. The relative standard deviations were in all cases less than 1.5%. The proposed method was successfully applied for the simultaneous determination of aluminum and iron in certified reference aluminum samples.

Elemental Analysis Using NMR: Simultaneous Determination of Aluminum and Sodium in Zeolite a Using Low-Field NMR

The standard methods for elemental analysis of aluminum and sodium in zeolites typically require significant sample and reagent preparation before the final titrimetric or atomic spectroscopic measurement. Low-resolution, bench top nuclear magnetic resonance (NMR) has shown important applications for rapid quantitative analysis of hydrogen and/or fluorine containing materials without sample preparation in the food, chemical, and polymer industries. Here we demonstrate the determination of aluminum and sodium in zeolite A without sample preparation by using multinuclear, low-field NMR. The simultaneous determination of aluminum and sodium can be performed in under five minutes with a precision of ∼ 1% relative. The method, calibration, data collection, and significant other applications are discussed.

Simultaneous Determination of Aluminium, Titanium and Vanadium in Serum by Electrothermal Vaporization–Inductively Coupled Plasma Mass Spectrometry

L. YU, S. ROY KOIRTYOHANN, MELVIN L. RUEPPEL, ANASTASIA K. SKIPOR and JOSHUA J. JACOBS, J. Anal. At. Spectrom., 1997, 12, 69 DOI: 10.1039/A604797A

Simultaneous determination of aluminium and beryllium at the subnanogram per millilitre level by solid-phase derivative spectrophotometry

The applicability of derivative solid-phase spectrophotometry is demonstrated for the resolution of mixtures of aluminium and beryllium with closely overlapping absorption profiles. A spectrophotometric method for the simultaneous determination of beryllium and aluminium based on first-derivative solid-phase spectrophotometry is proposed. Both metal ions were fixed on a dextran-type anion-exchanger gel at pH 4.4, as coloured complexes with Eriochrome Cyanine R in the presence of ethylenediaminetetra-acetic acid. The absorption spectrum of the gel, packed in a 1 mm cell, was recorded directly. The application range is up to 60 ng ml −1 for aluminium and up to 4.0 ng ml −1 for beryllium, and the RSD is 3.5% and 3.8%, respectively. The detection limit is 0.04 ng ml −1 for beryllium and 2.25 ng ml −1 for aluminium. The relative error obtained in the analysis of a synthetic aqueous solution is 1.50% for beryllium and 1.75% for aluminium. The method was applied to the determination of both analytes in natural water, orange juice, geological and botanical samples.

Separation and simultaneous determination of aluminum, iron, and manganese in natural water samples by using high-performance liquid chromatography with spectrophotometric and electrochemical detection

Reversed-phase liquid chromatography has been used to determine simultaneously trace levels of Al, Fe, and Mn in natural water samples after direct injection of their 8-quinolinol complexes onto a Bondasphere ODS column. Chromatographic separation can be made with the mobile phase of 2:3 acetonitrile/20 mM acetate buffer solution containing 5 mM 8-quinolinol reagent. Excellent sensitivity is obtained by spectrophotometric detection at 390 nm. The spectrometric detection limits of these metals are at the part per billion levels of test solution. The tolerance limits of numerous other metal ions are reported. Only Cr(III) and Ni(II) interfere with the determination of Al, and Mo(VI) interferes with the determination of Mn at concentrations less than a 100-fold excess. Analytical data obtained on river and sea water samples are in agreement with expected values. Amperometric detection of Mn and Fe with a thin-layer flow cell and a glassy-carbon working electrode is also described. This method is less sensitive but more specific than spectrophotometric detection.

Simultaneous determination of aluminium(III) and gallium(III) with lumogallion by phase-resolved fluorimetry

The simultaneous determination of AlIII and GaIII by the formation of fluorescent lumogallion chelates is described. The fluorescence spectra of the chelates severely overlap, but the fluorescence lifetime difference of 0.7 ns between the two chelates is large enough to permit phase-resolved fluorimetric determinations. The effects of pH on the fluorescence lifetimes and intensities of the metal chelates were studied. Steady-state and phase-resolved limits of detection and determination for the individual metal chelates were also examined.

Simultaneous Determination of Aluminum, Iron, Calcium, and Magnesium in Wet-Process Phosphoric Acid by DC Argon Plasma Emission Spectrometry

Abstract A method has been developed for the simultaneous determination of Al, Fe, Ca, and Mg in wet-process phosphoric acid by dc argon plasma emission spectrometry. The suppression of Ca and Mg emission by phosphate encountered in flame analyses was nonexistent, and other interferences were minimal. Results obtained by the procedure were compared with those obtained by atomic absorption spectrometry. The paired t-test showed no significant difference between the 2 methods at the 95% confidence level.

Simultaneous determination of aluminium and phosphorus by neutron activation analysis

With the use of the pneumatic tube system of the BER II reactor, the irradiation position of which is equipped with a movable cadmium shield, the aluminium and phosphorus levels in bone powder and in human bone biopsies were determined. The contribution of aluminium and phosphorus to the28Al activity could be separated mathematically after the samples had been irradiated with and without cadmium shielding. The sensitivity and limit of quantitative determination of the analytical procedure were determined using the addition method and the fact that the levels of each element measured was independent of the amount of the other element was proved.

Simultaneous elemental determination of aluminum and silicon in soils by gamma-ray detection following inelastic neutron scattering

The detection of prompt γ-rays produced by the inelastic scattering of fast monoenergetic neutrons has been used to determine the elemental composition of soil samples. Multigram samples were bombarded with 2.5 MeV neutrons, and concentrations were measured by analyzing the spectrum of emitted γ-rays. Particular emphasis has been placed on the simultaneous determination of aluminum and silicon. Possible extensions of the method to light elements are suggested.

Complexometric Determination of Trivalent Metal Ions Using 1,2‐Naphthoquinone‐4‐Sulphonic Acid‐2‐Thiosemicarbazone as Metallochromic Indicator

Abstract1,2‐Naphthoquinone‐4‐sulphonic acid‐2‐thiosemicarbazone (NQTS‐4S) has been used as visual indicator in the complexometric determination of trivalent metal ions, aluminium, gallium, indium, bismuth and iron. Simultaneous determination of aluminium and iron and of aluminium and copper has also been carried out. The standard deviation and percentage errors have also been calculated.

Simultaneous determination of aluminum and iron in plutonium

Simultaneous determination of aluminum and iron in plutonium

A microelectrode for measuring intracellular PO2.

A simple and reliable method of constructing an intracellular pH microelectrode is described. Antimony is used as the pH sensor. Antimony electrodes have been used in biological systems as early as 1927 (1). Since then several investigators have used different kinds of Sb electrodes. Roos and Boton (3) describe the latest methods of construction and application of pH sensitive micro-electrodes. In most cases the pH electrodes were fabricated by pulling glass capillaries filled with molten antimony and in a few cases by coating glass with antimony. The electrodes were of the open type.