Dispersion of magnetic graphene oxide nanoparticles coated with a deep eutectic solvent using ultrasound assistance for preconcentration of methadone in biological and water samples followed by GC–FID and GC–MS

Lamei, Navid, Ezoddin, Maryam, Ardestani, Mehdi Shafiee · Analytical and Bioanalytical Chemistry · 2017