Summary
A method is described for the determination of gold at ppM levels in geological materials by the use of flameless A. A. spectroscopy. The gold is separated as bromoaurate from HBr solution by methyl isobutyl ketone (MIBK). The MIBK phase is pipetted directly into an HGA-2000 Graphite Furnace. Detection limits of about 0.6–0.8 ppM Au for a 1-g sample are achieved. The error of determination (relative standard deviation) varies in the range 5–50%, depending on the absolute gold level.
Zusammenfassung
Ein Verfahren zur Bestimmung von ppM-Mengen Gold in geologischem Material mit Hilfe der flammenlosen Atomarabsorption wurde beschrieben. Dabei wird das Gold als Bromoaurat aus bromwasserstoffsaurer Lösung mit Methylisobutylketon extrahiert. Die organische Phase wird unmittelbar in einen HGA-2000 Graphitofen pipettiert. Die Nachweisgrenze beträgt etwa 0,6–0,8 ppM Au in einer 1-g-Einwaage. Die relative Standardabweichung variiert je nach der absoluten Goldmenge zwischen 5 und 50%.
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Sighinolfi, G.P., Santos, A.M. Determination of gold in geological samples at parts per milliard levels by flameless atomic-absorption spectroscopy. Mikrochim Acta 66, 33–40 (1976). https://doi.org/10.1007/BF01257090
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DOI: https://doi.org/10.1007/BF01257090