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

Abstract. Using two statistical models, based on the two-level full factorial designs and sequential experimental Doehlert designs, a simultaneous determination of cadmium and zinc by solid-phase derivative spectrophotometry has been proposed. These chemometric techniques have been used for the optimization of the instrumental and experimental variables of the system. The complexes formed between cadmium and zinc with 4-(2-pyridylazo) resorcinol, in the presence of potassium iodide, were ®xed on a dextran-type anionexchange gel, at pH 8.7. The absorbance spectra of the gel, packed in a 1-mm cell, were recorded directly. The performance characteristics of the proposed method have been established. The method was applied to the simultaneous determination of both analytes in synthetic mixtures and natural water samples.

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“…Cadmium stock solution. Prepared from 3CdSO 4 . 8H 2 O (Merck) in 1 M H 2 SO 4 solution according to [17].…”

Section: Reagents and Solid Ion Exchangermentioning

confidence: 99%

“…There also exist various methods for the resolution of mixtures of compounds. Some, such as the determination of beryllium and aluminium, require the prior formation of coloured complexes [4]. Others, such as the simultaneous determination of sulphonamides [5] or the determination of samarium and europium [6] are measured directly in the UV.…”

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confidence: 99%

Experimental Designs Applied to Solid-Phase Derivative Spectrophotometry

2000

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Section: Introductionmentioning

confidence: 99%

“…11,12 Simultaneous determination of Al(III) and Be(II) was also reported. [13][14][15] Capitán et al 13 determined Al(III) and Be(II) in mixtures in the range of 0.5 -5.0 ng mL -1 for both the cations, by first-derivative synchronous solid-phase spectrofluorometry, based on their complexes with morine.A derivative spectrophotometric method for simultaneous determination of Al(III) and Be(II) in the ranges of 108.0 -1080.0 ng mL -1 and 36.0 -360.0 ng mL -1 , respectively, was reported based on their complexes with 5,8-dihydroxy-1,4-naphthoquinone. 14 Valencia et al 15 reported a method for simultaneous determination of Al(III) and Be(II) by first derivative solid phase spectrophotometric method based on their complexes with Eriochrome Cyanine R. The application range was up to 60 ng mL -1 for aluminium and up to 4.0 ng mL -1 for beryllium.…”

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confidence: 99%

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Simultaneous Kinetic Determination of Beryllium and Aluminium by Spectrophotometric H-Point Standard Addition Method

Afkhami

Zarei

2004

ANAL. SCI.

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The toxicity of beryllium and aluminium as well as the need for sensitive and selective methods for determining these elements are well documented. Several instrumental methods for determination of beryllium and aluminium by spectrophotometry, 1-3 spectrofluorimetry, 4-7 flame atomic absorption spectrometry (AAS), 8 graphite furnace atomic absorption spectrometry (GFAAS), 9 and inductively coupled plasma atomic emission spectrometry (ICP-AES) 10 have been reported. The complexes of Be(II) and Al(III) with Chrome Azurol S (CAS) have been proposed for the spectrophotometric determination of both the elements individually. 11,12 Simultaneous determination of Al(III) and Be(II) was also reported. [13][14][15] Capitán et al. 13 determined Al(III) and Be(II) in mixtures in the range of 0.5 -5.0 ng mL -1 for both the cations, by first-derivative synchronous solid-phase spectrofluorometry, based on their complexes with morine.A derivative spectrophotometric method for simultaneous determination of Al(III) and Be(II) in the ranges of 108.0 -1080.0 ng mL -1 and 36.0 -360.0 ng mL -1 , respectively, was reported based on their complexes with 5,8-dihydroxy-1,4-naphthoquinone. 14 Valencia et al. 15 reported a method for simultaneous determination of Al(III) and Be(II) by first derivative solid phase spectrophotometric method based on their complexes with Eriochrome Cyanine R. The application range was up to 60 ng mL -1 for aluminium and up to 4.0 ng mL -1 for beryllium.H-point standard addition method (HPSAM) is a suitable method for resolving mixtures of substances with overlapping spectra. [16][17][18][19][20] The greatest advantage of HPSAM is that it can remove the errors resulting from the presence of an interference and reagent blank. 16 HPSAM can determine the two components simultaneously with extensively or even coincident overlapping spectra. 18 The Bosch-Reig et al. 21 method was aimed at establishing the fundamentals for application of the HPSAM to kinetic data for the simultaneous analysis of binary mixtures or the calculation of analyte concentrations completely free from bias error. For this purpose, they used two variants of the HPSAM: one is applied when the reaction of one component is faster than that of the other or the latter does not take place at all. This variant of the method is based on the assumption that only analyte X evolves with time and that the other species or interferents do not affect the analytical signal with time. In this case the variables to be fixed are two times t1 and t2 at which the species Y, which does not evolve with time or over the range between these times, should have the same absorbance. The other variant of the method is used when the rate constants of the two components are time-dependent. In this case, the two species in a mixture, X and Y, both evolve with time.In this paper, we describe a rapid, simple, precise and accurate method for the simultaneous determination of beryllium and aluminium by spectrophotometric H-point standard addition method. This method is based o...

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Spectrophotometric determination of trace amounts of beryllium using 1,8-dihydroxyanthrone as a new chromogenic reagent

Beiraghi¹,

Babaee²

2007

JICS

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A simple, rapid, and sensitive spectrophotometric method for the trace level determination of beryllium based on the formation of a 1:2 complex with anthralin (1,8-dihydroxyanthrone) as a new reagent is developed. A spectrophotometric method was used to determine the acidity constant and stepwise proton dissociation of the reagent. The experimental conditions for determining beryllium including the influences of pH, reagent concentration and time were evaluated and optimized. Under the optimum experimental conditions, the molar absorptivity of the complex is 0.47 × 10 4 l mol -1 cm -1 at 545 nm. Calibration graph was linear in the range of 0.04-1.04 μg ml -1 with a detection limit of 0.012 μg ml -1 and a %RSD of 0.43%, for 5 replicate determinations at 0.48 μg ml -1 of Be( ). The interferring effect of some cations and anions was also studied. The method was applied for the determination of beryllium in beryl, silicate rock and alloys. Ethylenediaminetetraacetic acid (EDTA) was used for masking interfering ions.

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

Cited by 20 publications

References 17 publications

Experimental Designs Applied to Solid-Phase Derivative Spectrophotometry

Experimental Designs Applied to Solid-Phase Derivative Spectrophotometry

Simultaneous Kinetic Determination of Beryllium and Aluminium by Spectrophotometric H-Point Standard Addition Method

Spectrophotometric determination of trace amounts of beryllium using 1,8-dihydroxyanthrone as a new chromogenic reagent

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