id	keyword
american_scientific_journal-4602	vol
american_scientific_journal-4602	ions
american_scientific_journal-4602	sorption
american_scientific_journal-4602	metal
american_scientific_journal-4602	zinc
american_scientific_journal-4602	concentration
american_scientific_journal-4602	manganese
american_scientific_journal-4602	adsorbent
american_scientific_journal-4602	iron
american_scientific_journal-4602	removal
american_scientific_journal-4602	material