Solid Phase Extraction Methodology for Robust Isotope Analysis of Atmospheric Ammonium.

The stable nitrogen isotope composition (δN) of atmospheric ammonia (NH) and ammonium (NH) has emerged as a potent tool for improving our understanding of the atmospheric burden of reduced nitrogen. However, current chemical oxidation methodologies commonly utilized for characterizing δN values of NH samples have been found to lead to low precision for low concentration (i.e.