espodumeno litio procesamiento de minerales Absorption spectroscopy Acetone Activated carbon Arsenic Arsenic speciation Atomic absorption spectrometry Copper Coupled circuits ETAAS Hydride generation-inductively coupled plasma optical emission spectrometry (HG-ICP-OES) Inductively coupled plasma Inductively coupled plasma optical emission spectrometry Iron Knotted reactor Knotted reactors LiF Medicinal herb On-line pre-reduction On-line removal of Cu and Fe interferences Polytetrafluoroethylenes Selenium Selenium determination Spectrometry Tea fluoración molienda de alta energía