List of Articles Carbon nanotubes functionalized with carboxyl Open Access Article Abstract Page Full-Text 1 - Solid phase extraction of trace cobalt (II) in industrial wastewaters by modified nanotube carbon carboxyl and its determination with flame atomic spectroscopy Open Access Article Abstract Page Full-Text 2 - Solid phase extraction of trace cobalt (II) in industrial wastewaters by modified nanotube carbon carboxyl and its determination with flame atomic spectroscopy