| http://www.w3.org/ns/prov#value | - Preferably, the intercalating agent is a solution containing a mixture of X/Y, wherein X can be sulfuric acid or sulfuric acid and phosphoric acid and Y is an oxidizing agent, such as nitric acid, perchloric acid, chromic acid, potassium permanganate, sodium nitrate, hydrogen peroxide, iodic or periodic acids.
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