| http://www.w3.org/ns/prov#value | - For example, this group may be the carboxyl acid group --COOH, or more or less neutral salt, or ester group --COOM or --COOR', where M is a metal and R' is a polyhydric alcohol, or a basic amine group such as NH3 OH. If the silica gel matrix contains a metallic hydroxide, a true chemical bond may occur by reaction with a --COOH group of the surface active agent.
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