Biosorbents Based on the Husk and Sprouts of Barley (Hordeum vulgare), Rice (Oryza sativa), and Pine Sawdust (Pinus sylvestris) for the Solid-Phase Extraction (SPE)-Based Preconcentration of Rare Earth Elements (REEs) with Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) Determination in Lignites
Biosorbents Based on the Husk and Sprouts of Barley (Hordeum vulgare), Rice (Oryza sativa), and Pine Sawdust (Pinus sylvestris) for the Solid-Phase Extraction (SPE)-Based Preconcentration of Rare Earth Elements (REEs) with Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) Determination in Lignites