SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 54:1289-1297 (1990)
© 1990 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Ion Chromatographic Determination of Total Metals in Soils

N. T. Basta and M. A. Tabatabai*

Agronomy Dep., Iowa State Univ., Ames, IA 50011

*Corresponding author.

ABSTRACT

An accurate and precise ion chromatographic (IC) method for determination of total Cu, Ni, and Zn in soils was developed. The sample preparation method consists of three steps: (i) digestion of the soil sample by using HNO3, HClO4, and HF; (ii) extraction of the metals of interest by using dithizone in CHCl3; and (iii) destruction of the metal-dithizonate complex with HNO3. The system consisted of a guard (HPIC-CG5) column and a separator (HPIC-CS5) column followed by postcolumn reaction with 4-(2-pyridylazo) resorcinol (PAR), to form colored metal complexes. The absorbance of the metal-PAR complexes was measured by an ultraviolet-visible light (UV-VIS) detector at 520 nm. Two different eluents were required for separation of these and other metals. Simultaneous determination of Cd, Cu, Mn, and Zn was achieved by using an eluent containing 4 mM 2,6-pyridinedicarboxylic acid (PDCA) and 50 mM HOAc-NaOAc buffer (pH 4.8). Simultaneous determination of Cu, Ni, Pb, and Zn was accomplished by using an eluent containing 40 mM oxalic acid and 50 mM HOAc-LiOAc buffer (pH 4.8). Results by the IC method for determination of total Cu, Ni, and Zn in 14 soils were in good agreement with those obtained by atomic absorption spectrophotometry, but results also showed that the proposed IC method is inadequate for determination of total Cd, Mn, and Pb in soils.

NOTES

Journal Paper no. J-13761 of the Iowa Agric. and Home Econ. Exp. Stn., Ames. Projects 2112 and 2431.

Received for publication October 10, 1989.




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Copyright © 1990 by the Soil Science Society of America.