Validation of adsorbents for sample preconcentration in compound-specific isotope analysis of common vapor intrusion pollutants

► Adsorbents samplers permit preconcentration of volatiles from dilute air vapor. ► Isotope effects were determined in preconcentration of PCE, TCE and benzene. ► Tests performed for 100 L air samples with PCE, TCE and benzene vapor. ► Carboxen 1016 performed without isotope ratio artifacts for all parameters tested. ► Carboxen 1016 suitable for isotope ratio analysis of PCE, TCE or benzene vapor.