ISSN:
1573-2932
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
Notes:
Abstract This study evaluated the effect of extreme HCl deposition on soil acid neutralization following simulated shuttle rocket launches. Four soils along a soil chronosequence from Vandenberg Air Force Base were selected and evaluated as a function of pH spike addition (pH=1.0, 2.5, 4.0, and 5.6) and time (0 to 4 mo) in a leaching-incubation experiment. The pH=1.0 treatment led to a rapid soil extract pH decrease to 2.5 in poorly buffered soils and increased leaching of basic cations (Ca, Mg, K, and Na), Al, and Si. In general, there were no significant differences among the pH= 2.5, 4.0, and 5.6 treatments. Acid neutralization capacity increased with increasing soil age. The acid neutralization process involved two steps. In Step 1, acid is neutralized by direct or indirect exchange with exchangeable basic cations. The most likely mechanisms for this step are: (1) the direct exchange of H′ for basic cations followed by an interchange reaction between surface H′ and structural Al, and (2) the indirect exchange through H+ neutralization by polyhydroxyl-Al complexes with concurrent base displacement. Acid neutralization by a gibbsite-like mineral is an unlikely mechanism controlling the initial acid neutralization step. Eventually a pure acidic (H-A l) complex develops. In Step 2, further acid neutralization is governed by mineral dissolution via the acidic cations (H′, All').
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00279201
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