Determination of isoprene-derived secondary organic aerosol tracers (2-methyltetrols) by HPAEC-PAD: Results from size-resolved aerosols in a tropical rainforest

► New HPAEC-PAD method for identifying and quantifying 2-methyltetrols. ► The size distributions of 2-methyltetrols exhibited a unimodal pattern. ► 2-Methylerythritol correlated excellently with 2-methylthreitol. ► Similar isomeric fractions of the 2-methyltetrols were obtained in all particle sizes.