Proconcentration of trace elements from high-purity thorium and uranium on Chelex-100 and determination by graphite furnace atomic absorption spectrometry with Zeeman-effect background correction

Raje, Naina; Kayasth, S. R.; Asari, T.P.S.; Gangadhaŕan, S.

doi:10.1016/0003-2670(94)80125-8

Cited by 19 publications

(8 citation statements)

References 21 publications

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“…Raje et al [24] reported a method with preconcentration of trace impurities from large-sized samples of uranium metal and thorium oxide using a small column of Chelex-100 followed by their determination using graphite furnace atomic absorption spectrometry (GFAAS). The 0.5-10 g of sample (uranium metal or thorium oxide) was dissolved, complexed with ammonium carbonate and submitted to the ion-exchange procedure.…”

Section: Electrothermal Atomic Absorption Spectrometry With Graphite mentioning

confidence: 99%

“…Low concentrations of these impurities in the range of mg g −1 to μg g −1 associated with uranium complex matrices as UO 2 , U 3 Si 2 , U 3 O 8 , U-MO, need to be developed and compatible analytical methodologies must to be validated [24]. A strict quality control is needed to produce nuclear fuel based on uranium.…”

Section: Introductionmentioning

confidence: 99%

“…No single analytical technique seems ideally suitable to estimate all the elemental impurities, since most of the elements are in ultratraces levels, and sometimes the techniques used do not exhibit a detection limit required for the determination of these analytes [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An overview of spectrometric techniques and sample preparation for the determination of impurities in uranium nuclear fuel grade

Souza

Cotrim

Pires

2013

Microchemical Journal

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Section: Electrothermal Atomic Absorption Spectrometry With Graphite mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An overview of spectrometric techniques and sample preparation for the determination of impurities in uranium nuclear fuel grade

Souza

Cotrim

Pires

2013

Microchemical Journal

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“…GFAAS is one of the few analytical techniques which fulfills these requirements, and is the method most frequently used. GFAAS was used for the determination of trace impurities from large size sam-ples of uranium metal and thorium oxide using a small column of chelx-100 [17]. Multi-element GFAAS was used for the determination of minor and trace amount of elements in silicate rock, lake and stream sediments [18].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Trace Elements in Fly Ash Released from Coal Combustion

Eltayeib¹

2014

OALib

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Qingshan Thermoelectric Plant located in Wuhan City, Hubei Province, China, and it uses coal as a fuel. Coal combustion generates not only gaseous pollutants like SO 2 and NO x but also toxic and heavy metals to the atmosphere. From the environmental point of view, the determination and speciation of trace toxic and heavy metals released from coal combustion are very important. In this work, the atomic spectroscopic methods for determination of some trace elements were first established. Graphite furnace atomic absorption spectrometry (GFAAS) method was used to determine the trace Pb in standard reference material SRM 8322 (fly ash from combustion of pulverized coal). The hydride generation atomic absorption spectrometry coupled with flow injection analysis (HGAAS-FIA) was used to analyze the concentration of As in SRM 8322 and the ICP-AES for determination of trace elements Co, Ni, Cu, Cr, etc. For the laboratory research work, all the coal samples were digested with a mixture of acids (HNO3-HF-HCLO4) after burned at 650˚C for one hour. Based on the establishment of atomic spectroscopic determination methods Tessier sequential speciation and separation methods were used in the studies of speciation distribution of some heavy metals in fine particles released from coal combustion of Qingshan Thermoelectric Plant. The transition elements in two samples from Qingshan Thermoelectric Plant (with different combustion condition) were extracted into five fractions by sequential extraction. In each fraction a suitable reagents with an optimum pH and time were used. Centrifugate separation of liquid part from the solid part was used after each fraction, the liquid part is taken for analysis and the solid part was extracted with a suitable reagents for the next fraction and the reaction continued for certain time. This procedure was done for the five fractions (exchangeable, carbonate bounded, Fe-Mn oxide bounded, organic matter bounded and residual). The experiment of the stimulant acid rain reacted with coal ash were also done in order to evaluate the transformation of these trace elements into water system after the fine particles of coal ash act with acid rain. The results showed that most parts of the metal in particles are stable. In order to study the distribution tendency of trace elements in coal, the separation of different coal particles were done using organic solvent extraction and gravity settlement method. The results showed that different trace elements had different distribution tendency in coal.

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“…15 However, certain pretreatments are required when the concentrations of the interesting species are below the detection limit. The pretreatments used for determining ultra-trace cobalt include: (1) co-precipitation: as disulfides, 16 or as Ni/8-quinolinol/1-nitroso-2-naphthol complexes; 17 (2) ion-exchanging with Chelex-100 18 or Amberlite IR-120 resin; 19 and (3) adsorption with chitosan 20 or on-line sorption in a knotted pre-coated reactor. 21 The selection of an effective chemical modifier has been a critical step in successful ETAAS analysis.…”

Section: Introductionmentioning

confidence: 99%

Ascorbic acid as effective chemical modifier for cobalt determination in nickel-based alloys by electrothermal atomic absorption spectrometry with longitudinal Zeeman background correction

Sun

Shiue

Tsai

2001

J. Anal. At. Spectrom.

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Proconcentration of trace elements from high-purity thorium and uranium on Chelex-100 and determination by graphite furnace atomic absorption spectrometry with Zeeman-effect background correction

Cited by 19 publications

References 21 publications

An overview of spectrometric techniques and sample preparation for the determination of impurities in uranium nuclear fuel grade

An overview of spectrometric techniques and sample preparation for the determination of impurities in uranium nuclear fuel grade

Estimation of Trace Elements in Fly Ash Released from Coal Combustion

Ascorbic acid as effective chemical modifier for cobalt determination in nickel-based alloys by electrothermal atomic absorption spectrometry with longitudinal Zeeman background correction

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