Atom-formation processes in carbon-furnace atomizers used in atomic-absorption spectrometry

Campbell, W. C.; Ottaway, J. M.

doi:10.1016/0039-9140(74)80221-3

Cited by 134 publications

(38 citation statements)

References 4 publications

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“…An investigation of the GFAAS measurement parameters, such as pre-atomization temperature, atomization temperatures and time, is very important for achieving precise and sensitive atomic absorbance measurements. The pre-atomization temperature is critical in case of silver since AgNO 3 dissociates to silver oxide (Ag 2 O) at 300 o C, which decomposes immediately, and Ag atomization takes place at 877 o C (53). For optimization of the GFAAS measurement parameters, the effects of the pre-atomization and atomization temperature on the absorbance were investigated using the GF 3000 graphite furnace atomizer in the temperature range of 300-700 o C for Ag in 20 mg/mL of uranium matrix.…”

Section: Resultsmentioning

confidence: 99%

Direct Determination of Silver in Uranium-Zirconium-Based Metallic Fuel Using GFAAS: An Insight Into the Effect of Matrix on the Atomization of Silver

Gupta¹,

Goyal²

2013

At.Spectrosc.

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Atomization of silver in a U+Zr matrix was studied and the effect of Zr/U+Zr composition of the matrix on analyte absorbance was investigated. The changes observed in the absorbance signals for the analyte with a change in composition of the U+Zr matrix are correlated to the relative oxygen partial pressures of UO 2 and ZrO 2. In these studies the direct determination of trace levels of silver in a U+Zr matrix containing 20% Zr was performed by graphite furnace atomic absorption spectrometry (GFAAS), resulting in a relative precision of approximately ±10%. The method was also evaluated by analyzing synthetic U+Zr samples and the results agreed favorably with the added contents. It is of significance to note that the present method gains in importance due to its ability to determine silver without the need of prior chemical separation of the U+Zr matrix. The analytical procedure developed can be applied to the rapid analyses of fast breeder reactor (FBR) sample solutions without pre-treatment of the samples such as separation and pre-concentration of the matrix.

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Section: Resultsmentioning

confidence: 99%

Direct Determination of Silver in Uranium-Zirconium-Based Metallic Fuel Using GFAAS: An Insight Into the Effect of Matrix on the Atomization of Silver

Gupta¹,

Goyal²

2013

At.Spectrosc.

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“…In comparison to the GF atomizer, an ICP atomizer has an inert Ar environment and by virtue of its high temperature, the only mode of atomization in ICP is oxide dissociation. It was reported for Ag (18), Cd, Cu, and Mn ( 19) that in a GF atomizer when AgNO 3 , Cd(NO 3 ) 2 , Cu(NO 3 ) 2 , and Mn(NO 3 ) 2 are atomized, Cd and Mn undergo oxide dissociation, while Ag and Cu undergo a carbothermic reduction reaction. However, the sensitivities obtained for Cu and Mn presently are better with the ICP atomizer than with GF, and hence the mode of atomization alone does not explain the better sensitivities for Cu and Mn in the ICP atomizer.…”

Section: Comparison Of Results For Gf Atomizer With Icp Atomizermentioning

confidence: 99%

Determination of Cu and Mn in Uranium by Inductively Coupled Plasma Atomic Absorption Spectrometry (ICP-AAS)

Goyal¹

2012

At.Spectrosc.

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“…An investigation of the GFAAS measurement parameters (preatomization temperature, atomization temperature, and time) is very important for achieving precise and sensitive atomic absorbance measurements. The pre-atomization temperature is critical in the case of silver since AgNO 3 dissociates to silver oxide (Ag 2 O) at 300 o C, which decomposes immediately, and Ag atomization takes place at 877 o C (25). For optimization of the GFAAS measurement parameters, effects of the pre-atomization and atomization temperature on the absorbance were investigated on GF 3000 in the temperature range of 300-700 o C for Ag in 20 mg/mL thorium matrix.…”

Section: Resultsmentioning

confidence: 99%

Development of Analytical Methods for the Direct Determination of Silver in Plutonium-Thorium and Uranium-Thorium-Based Fuels Using GFAAS

Goyal¹

2011

At.Spectrosc.

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Studies on the atomization of silver in Pu+Th and U+Th matrices were carried out. The effect of matrix composition and its concentration on Ag absorbance using graphite furnace atomic absorption spectrometry (GFAAS) was investigated. These studies showed that the absorbance signal observed for Ag in a mixed matrix was enhanced compared to that observed for a pure thorium matrix, but it is poorer than in matrix-free solutions. The enhancement was found to be more pronounced in a Pu+Th than in U+Th matrix. The difference in the behaviors of Ag atomization efficiency in these matrices is explained on the basis of change of pO 2 during dissociation of plutonium nitrate and uranyl nitrate at the atomization temperature of silver. Accumulation of Pu and U with successive loading in the graphite atomizer did not have any additional effect on the ana-Recent Compact High Temperature Reactor (CHTR) designs generally make use of fuel kernels surrounded by four successive layers

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Atom-formation processes in carbon-furnace atomizers used in atomic-absorption spectrometry

Cited by 134 publications

References 4 publications

Direct Determination of Silver in Uranium-Zirconium-Based Metallic Fuel Using GFAAS: An Insight Into the Effect of Matrix on the Atomization of Silver

Direct Determination of Silver in Uranium-Zirconium-Based Metallic Fuel Using GFAAS: An Insight Into the Effect of Matrix on the Atomization of Silver

Determination of Cu and Mn in Uranium by Inductively Coupled Plasma Atomic Absorption Spectrometry (ICP-AAS)

Development of Analytical Methods for the Direct Determination of Silver in Plutonium-Thorium and Uranium-Thorium-Based Fuels Using GFAAS

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