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Determination of sub-microgram amounts of bismuth in water by atomic absorption spectrophotometry following flotation separation

Bestimmung von Sub-Mikrogramm-Mengen Bismut in Wasser durch AAS nach vorausgehender Flotationstrennung

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Zusammenfassung

Bismut(III) wird in einer 1 l-Wasserprobe mit Eisen(III)-hydroxid bei pH 4,0±0,2 mitgefällt. Der Niederschlag wird mit einem Tensidgemisch (Natriumdodecylsulfat + Natriumoleat) mit Hilfe kleiner Luftblasen flotiert, abgetrennt und in verd. Salzsäure gelöst. Vor der Bestimmung wird Kaliumiodid zugesetzt. Bi wird durch AAS in Form von BH3 bestimmt, das mit Hilfe von NaBH4 erzeugt wird. Bi-Mengen von 0,3–0,6 μg in 1000ml einer natürlichen Wasserprobe konnten mit einer Wiederfindung von >97% erfaßt werden. Die rel. Standardabweichung war <3%.

Summary

A method is described for the flotation and determination of sub-microgram levels of bismuth in water. Bismuth(III) in a 1000ml sample of water is coprecipitated with iron(III) hydroxide at pH 4.0±0.2. The precipitate is floated with the aid of a mixed surfactant (sodium dodecyl sulphate and sodium oleate) and small air bubbles, then separated and dissolved in dilute hydrochloric acid. Prior to determination, potassium iodide is added. Finally, the bismuth content is determined by generation of bismuth hydride using sodium borohydride as a reductant and subsequent atomic absorption spectrophotometry with a 60 cm absorption tube. Bismuth at the levels of 0.3 μg and 0.6 μg added to 1000ml of natural water could be determined with a recovery of above 97 % and with a relative standard deviation within 3%.

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  1. Inst. for Agric. and Biol. Sciences, Okayama Univ., Kurashiki-shi, 710, Okayama, Japan

    Susumu Nakashima

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  1. Susumu Nakashima
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Nakashima, S. Determination of sub-microgram amounts of bismuth in water by atomic absorption spectrophotometry following flotation separation. Z. Anal. Chem. 303, 10–13 (1980). https://doi.org/10.1007/BF00474298

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  • DOI: https://doi.org/10.1007/BF00474298

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