id	keyword
american_scientific_journal-1066	leaching
american_scientific_journal-1066	cca
american_scientific_journal-1066	sorbents
american_scientific_journal-1066	wood
american_scientific_journal-1066	metal
american_scientific_journal-1066	chromium
american_scientific_journal-1066	copper
american_scientific_journal-1066	arsenic
american_scientific_journal-1066	engineering