Correlations between soil characteristics and the Kr for individual and competitive sorption or retention of Pb²⁺ and Cd²⁺.

<p>Kr,s: Kr sorption; Kr,r: Kr retention. Ssa: Specific surface area. Nc: No correlation.</p><p>**The correlation is significant at the level of 0.01 (bilateral).</p><p>*The correlation is significant at the level of 0.05 (bilateral).</p><p>Correlations between soil characteristics and the Kr for individual and competitive sorption or retention of Pb²⁺ and Cd²⁺.