Speciation of thallium in river sediments by consecutive leaching techniques View Full Text


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Article Info

DATE

1992-05

AUTHORS

Manfred Sager

ABSTRACT

Freshwater sediments, non-polluted with respect to thallium, have been submitted to two independent sequential leaching procedures. Small concentrations require graphite furnace AAS measurements. The sensitivity of graphite furnace AAS is significantly lowered by matrix effects from both the reagent solutions, and also dissolved Ca, Mg, Fe and P. Separation and enrichment from acetate buffer, dithionite buffer, as well as from NaOH and HNO3 after neutralization, can be achieved by coprecipitation with MnO2. Hydroxylamine in acetic acid as well as oxalate has to be destroyed by oxidation with H2O2, catalyzed by Pd. From NH4Cl and HCl, Tl is not coprecipitated with MnO2. It can be however, separated, by liquid-liquid extraction from 1M HCl into butyl acetate. As a result of the leaching sequence, Tl is found largely in the nitric-acid leachable, and the oxalate-leachable fractions. In the alternative sequence it is evenly distributed among alkali-mobile and acid-mobile fractions. Soluble thallium was completely adsorbed by the sediments from tap water overnight. In subsequent sequential leaching, it was found highly exchangeable at pH 7 against ammonium chloride or ammonium acetate. More... »

PAGES

241-251

References to SciGraph publications

  • 1984. Thallium in ANTHROPOGENIC COMPOUNDS
  • 1959-07. Die Verwendung der Verdampfungsanalyse zur Erfassung geringster Stoffmengen in ANALYTICAL AND BIOANALYTICAL CHEMISTRY
  • 1963-01. Photometrische Bestimmung kleiner Thalliummengen mit primären aromatischen Aminoverbindungen in ANALYTICAL AND BIOANALYTICAL CHEMISTRY
  • Journal

    TITLE

    Microchimica Acta

    ISSUE

    3-6

    VOLUME

    106

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf01242096

    DOI

    http://dx.doi.org/10.1007/bf01242096

    DIMENSIONS

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