Determination of oil reservoir radiotracer (S14CN−) in a single step using a plastic scintillator extractive resin

► A new procedure for S14CN− radiotracer determination using PS resin was established. ► The minimum detectable activity for a 100 mL sample is 0.08 Bq L−1. ► The minimum quantifiable activity for a 100 mL sample is 0.31 Bq L−1. ► PS resin is capable to quantify S14CN− radiotracer samples with errors lower than 5%. ► PS resin is also capable to quantify complex matrices obtained from oil reservoirs.