Determination of chromium in gallium arsenide by electrothermal atomic absorption spectrometry

doi:10.1016/S0003-2670(00)84315-9

Analytica Chimica Acta

Volume 159, 1984, Pages 375-380

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Abstract

The sample is decomposed with 50% (v/v) aqua regia and the diluted solution is injected into the graphite furnace. The temperature program developed minimizes non-specific background signals, so that correction is not required. For a 100-mg sample, the 3σ detection limit is 70 ng Cr g⁻¹. The relative standard deviation of the overall procedure is 5–7%.

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An ion exchange method is described for the quantitative separation of ca. twenty trace elements from high purity gallium metal. 0.5–2 g of matrix is dissolved and subjected to a separation procedure using an anion exchanger in hydrochloric acid followed by sodium hydroxide medium to preconcentrate the analytes. Desorbed analytes are then available for their quantification depending upon the availability of the technique and its sensitivity. Graphite furnace atomic absorption spectrometry and neutron activation analysis techniques have been used for their final determination during this work. Most of the analytes found were in the ng g⁻¹ range. Depending on the blank values, the reproducibility of the overall procedure is 2–10%. Separation of the matrix and recovery of the analytes were essentially complete as confirmed by standard addition of the analytes to the matrix and also by tracer studies.
Determination of trace elements in gallium arsenide by graphite-furnace atomic absorption spectrometry after pretreatment in gas streams
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Atomic absorption spectrometry (AAS) with a resistively-heated graphite furnace is used for the determination of chromium (0.3–1 atom/10⁶ atom) in chromium-doped gallium arsenide after pretreatment in a separate furnace in a stream of argon to remove arsenic, and of manganese and silver (0.03 and 0.04 atom/10⁶ atoms, respectively) by a similar procedure after pretreatment with argon and chlorine, the latter to remove both gallium and arsenic as volatile chlorides. Results for chromium were in agreement with those obtained by furnace AAS after dissolution and by spark-source mass spectrometry (SSMS) but AAS after dissolution is more precise. Results for manganese and silver obtained by both gas pretreatments were in good agreement, but were higher than those obtained for presparked material by SSMS, indicating that surface contamination of gallium arsenide was not completely removed by the etching methods used. The procedures established that the concentrations of bismuth, indium and lead in the gallium arsenide sample were below the limits of detection of 3 × 10⁻³, 10 × 10⁻³ and 1 × 10⁻³ atom/10⁶ atoms, respectively. In all cases, calibration graphs were constructed from data obtained with aqueous solutions of appropriate salts.
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Short communicationDetermination of chromium in gallium arsenide by electrothermal atomic absorption spectrometry

Abstract

J. Cryst. Growth

Anal. Chim. Acta

Anal. Chim. Acta

Spectrochim. Acta

Short communication
Determination of chromium in gallium arsenide by electrothermal atomic absorption spectrometry