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July 1, 1974Journal of Environmental Quality

Determination of Trace Metals in Sodium Dithionite‐Citrate Extracts of Soils and Sediments by Atomic Absorption

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Authors

EJE.A. JenneJBJames W. BallCSC.L. Simpson

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Overview

Methodological study demonstrates accurate trace metal quantification in soil and sediment dithionite-citrate extracts, indicating effective elimination of iron and zinc interference.

Key Points

  • Develop an atomic absorption spectrometry method to determine trace metals, including cobalt, copper, nickel, molybdenum, and zinc, in dithionite-citrate extracts of soils and sediments.
  • Precleaned sodium dithionite-citrate extractant solutions to eliminate background zinc contamination.
  • Adjusted sample aliquot volumes to maintain a constant iron content of 5,000 µg across all samples, standards, and blanks.
  • Cheated and concentrated trace elements alongside iron using ammonium-1-pyrrolidine dithiocarbamate followed by two sequential 10-mL methyl isobutyl ketone extractions.
  • Precleaning the dithionite-citrate mixture markedly lowered the analytical detection threshold for zinc and other target trace metals.
  • Standardizing iron concentration to 5,000 µg prevented flame matrix interferences during atomic absorption while avoiding extraction-phase overloading.
  • Natural fulvic acids released during iron and manganese oxide dissolution produced no notable interference during solvent extraction due to iron-mediated releasing effects.

Cite This Study

Jenne et al. (1974) studied this question.

synapsesocial.com/papers/6a9523ab2dd91e6efbf221f7https://doi.org/10.2134/jeq1974.00472425000300030021x
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