Simultaneous derivative spectrophotometric determination of thorium and uranium in a micellar medium

Agnihotri, Narinder Kumar; Singh, Vinay; Singh, Har Lal

doi:10.1016/0039-9140(93)80107-3

Cited by 24 publications

(12 citation statements)

References 10 publications

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“…It is clear that the best serious interference is insoluble metal hydroxide salts in higher alkaline pH values from 9. 5 4+ and La 3+ ions caused a serious interference. The tolerable limits for these interfering species are given in Table 2 in both the presence and absence of masking agents.…”

Section: Ebt/u(vi) Concentration Ratio Correlation Coefficient Rmentioning

confidence: 99%

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Surfactant Enhanced-Spectrophotometric Determination of Uranium (VI) at Trace Levels by Using Eriochrome Black T as a Chelating Agent

2017

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92440.60 L mol -1 cm -1 and Sandell's sensitivity of 2.92 µg cm 2-in micellar medium while it allows the determination of uranium in the concentration range of 0.25-2.5 µg mL -1 with a molar absorption coefficient of 57019.44 L mol -1 cm -1 and Sandell's sensitivity of 4.74 µg cm 2-at 565 nm in water. The method has a detection limit of 4.60 µg L -1 (C DL : 3S b /m) at an analytical measurement wavelength of 637 nm with a bathochromic shift of 72 nm. The selectivity of chelating reagent was improved by the use of a mixture containing ethylenediaminetetraacetic acid (EDTA), sulfosalycylic acid and NaF as masking agent . The proposed method has been successfully applied to the determination of uranium at trace levels in different environmental water samples such as tap-water, natural springwater and river-water. The precision (with coefficient of variation of 1.85%) and the accuracy obtained were highly satisfactory. In order to test the accuracy and validation of the method, the certified reference material (TMDA-70; fortified lake water sample) was also analyzed. It was found that the found and the certified values were in good agreement for validating the surfactant enhanced-spectrophotometric method.

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Section: Ebt/u(vi) Concentration Ratio Correlation Coefficient Rmentioning

confidence: 99%

“…The method was applied to the determination of uranium in real water samples. The results were evaluated by adding standard U(VI) solutions at known amounts into the samples under the agents after extraction of its complexes in some organic solvents [5][6][7]. These methods lack sensitivity and selectivity.…”

Section: Introductionmentioning

confidence: 99%

Surfactant Enhanced-Spectrophotometric Determination of Uranium (VI) at Trace Levels by Using Eriochrome Black T as a Chelating Agent

2017

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“…Several instrumental methods for the determination of beryllium by spectrophotometry, [12][13][14][15] spectrofluorometry, [16][17][18] atomic absorption spectrometry (AAS), 19 graphite furnace atomic absorption spectrometry (GFAAS), 20 and inductively coupled plasma atomic emission spectrometry (ICP-AES) 21 have been reported. In contrast to the majority of these expensive and sophisticated analysis systems, absorption spectrophotometric methods offer many appealing characteristics, including simple instrumentation, rapid response times and easy operation.…”

Section: Introductionmentioning

confidence: 99%

Cloud-Point Formation Based on Mixed Micelles for the Extraction, Preconcentration and Spectrophotometric Determination of Trace Amounts of Beryllium in Water Samples

Beiraghi¹,

Zarei

Babaee³

2007

ANAL. SCI.

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The use of beryllium metal, alloys and its compounds in metallurgy, aerospace, and nuclear installations as well as their emission during the combustion of coal and oil, and the toxicity makes this element a serious environmental hazard. 1,2 Beryllium is one of the most toxic non-radioactive elements to be found at ultra-trace levels (ng L -1 -sub ng L -1 ) in natural water sources. [3][4][5] However, some acidic river water or hotspring water samples have a high beryllium concentration at trace levels (μg L -1 -sub μg L -1 ). 4,6 Beryllium is an insidious poison with a latent toxicity and prolonged excretion in urine for 10 years of exposure. 7 Although acute and chronic beryllium disease (CBD) occurs mainly by the inhalation of industrial gases and dust, the determination of trace amounts of beryllium in natural water samples is of interest, because it can indicate environmental pollution, and could provide information about the metal uptake through these sources. EPA drinkingwater regulations require that the beryllium levels be maintained below 4 μg L -1 . 8 Chronic beryllium diseases produce scarring of lung tissue. The lung condition may take years (average 10 -15 years) to develop symptoms. 9,10 Because of the seriousness of CBD, the United State Department of Energy (DOE) promulgated in 1999 the CBD preventation program, 10CFR part 850, to protect DOE workers. It requires frequent monitoring of air and possible contaminated surfaces to identify potential health risk;11 there is an increased need for beryllium analysis in DOE facilities.Therefore, highly sensitive analytical methods are necessary for the preconcentration and determination of beryllium.Several instrumental methods for the determination of beryllium by spectrophotometry, 12-15 spectrofluorometry, 16-18 atomic absorption spectrometry (AAS), 19 graphite furnace atomic absorption spectrometry (GFAAS), 20 and inductively coupled plasma atomic emission spectrometry (ICP-AES) 21 have been reported. In contrast to the majority of these expensive and sophisticated analysis systems, absorption spectrophotometric methods offer many appealing characteristics, including simple instrumentation, rapid response times and easy operation. These properties are highly desirable to the future design and development of portable analytical devices capable of quickly responding to trace levels of hazardous beryllium content in the field.Recently, cloud-point extraction (CPE) based on the clouding phenomenon of surfactants over a certain temperature, has become increasingly attractive. As a new separation technique, CPE offers many advantages over traditional liquid-liquid extraction. 22,23 In addition, CPE can lead to a higher recovery efficiency and a large preconcentration factor because the presence of a surfactant can minimize the losses of analytes due to their adsorption onto the container. The small volume of the surfactant-rich phase obtained with this methodology permits the design of extraction schemes that are simple and cheap, and have lower toxicity...

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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.…”

mentioning

confidence: 99%

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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Simultaneous derivative spectrophotometric determination of thorium and uranium in a micellar medium

Cited by 24 publications

References 10 publications

Surfactant Enhanced-Spectrophotometric Determination of Uranium (VI) at Trace Levels by Using Eriochrome Black T as a Chelating Agent

Surfactant Enhanced-Spectrophotometric Determination of Uranium (VI) at Trace Levels by Using Eriochrome Black T as a Chelating Agent

Cloud-Point Formation Based on Mixed Micelles for the Extraction, Preconcentration and Spectrophotometric Determination of Trace Amounts of Beryllium in Water Samples

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

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