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  • 1
    Electronic Resource
    Electronic Resource
    Preconcentration of trace heavy metals in water by coprecipitation with magnesium oxinate for electrothermal atomic absorption spectrometry (1996)
    Springer
    Microchimica acta 124 (1996), S. 27-34 
    Details
    ISSN: 1436-5073
    Keywords: preconcentration ; coprecipitation ; magnesium oxinate ; trace heavy metals ; water analysis ; electrothermal atomic absorption spectrometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Nanogram quantities of heavy metals in 200 ml of water were quantitatively preconcentrated by coprecipitation with magnesium oxinate at pH 9–9.5. The precipitate was collected on a 1-μm Nuclepore membrane filter and then dissolved in 5 ml of 1 mol/l nitric acid. After diluting to 10 ml with water, a 10- or 20-μl aliquot of the solution was directly analyzed by electrothermal atomic absorption spectrometry using deuterium background correction. The background absorption due to the collector magnesium oxinate was negligibly small. The optimized coprecipitation technique has been applied to the determination of cobalt, nickel, copper, cadmium and lead at the ppt level in river and seawater. The relative standard deviations were within 10% and the detection limits were 0.025 (for Co), 0.019 (for Ni), 0.006 (for Cu), 0.001 (for Cd) and 0.017 μg/l (for Pb). Blanks through the whole procedure were not detectable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244953
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of carrier elements for coprecipitation and graphite-furnace atomic absorption spectrometry (1997)
    Springer
    Microchimica acta 127 (1997), S. 119-123 
    Details
    ISSN: 1436-5073
    Keywords: coprecipitation ; metal hydroxides ; carrier elements ; thiourea ; graphite-furnace atomic absorption Spectrometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The group IIIB elements (aluminum, gallium and indium) and iron(III) were studied from the standpoint of the advantageous combination of coprecipitation and graphite-furnace atomic absorption Spectrometry (GFAAS). Milligram quantities of four hydroxides were precipitated at different pH's from solutions containing traces of copper(II) and cadmium(II) ions, in order to examine the effect of pH on the coprecipitation. Almost similar results were obtained for gallium, indium and iron hydroxides, with which the copper and cadmium were coprecipitated nearly completely at pH〉7. In case of aluminum hydroxide, the optimal pH range was narrow because of the redissolution of the precipitate in alkaline solutions. The removal of indium carrier was successfully achieved by volatilization as bromide at the pyrolysis stage in GFAAS, otherwise serious background absorption interfered with the trace determination. Volatilization loss of cadmium was eliminated by adding a small amount of miourea. Gallium carrier was mostly removed as chloride, but large background absorption still occurred in the determination of cadmium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01243175
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    Paper (German National Licenses)
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