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Soil Science:
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CHEMISTRY AND SPECIATION OF SOIL WATER FROM SERPENTINITIC SOILS: IMPORTANCE OF COLLOIDS IN THE TRANSPORT OF Cr, Fe, Mg, AND Ni.

GASSER, UBALD G.; JUCHLER, STEPHAN J.; STICHER, HANS

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Abstract

This study focused on the chemistry of soil water samples (SWS) obtained by tension-free lysimetry from serpentinitic, i.e., Cr- and Ni-rich, Dystric Eutrochrepts. Soil water samples from undisturbed soil profiles had total elemental concentrations ([mu]nmol/L) of O.1-3.2 Cr, O.2-3.1 Ni, 3-154 Fe, and 55-401 Mg; however, dialysis revealed that on average, only 72% of total Mg, 39% Ni, 28% Cr and 15% Fe were present in dissolved form. Thus, in serpentinitic soils, colloids can be an important means of element translocation. Among metallic cations, Mg contributed generally more than 50% to the positive charge of SWS; also, there was a high linear correlation between dissolved (dialyzable) Mg

(C) Williams & Wilkins 1994. All Rights Reserved.

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