Lignitic Humic Acids as Environmentally-Friendly Adsorbent for Heavy Metals

Table 3

Average participation in total adsorption amount for Cd²⁺, Cu²⁺, Pb²⁺, and Zn²⁺ ions adsorbed from their mixture.

Cd^2+	Cu^2+	Pb^2+	Zn^2+
21.0%	23.7%	31.7%	23.6%