Rapid determination of ultra-trace plutonium isotopes (Pu, Pu and Pu) in small-volume human urine bioassay using sector-field inductively coupled plasma mass spectrometry.
Journal:
Analytica chimica acta
Published Date:
Oct 17, 2017
Abstract
A rapid method with enhanced U decontamination was developed for ultra-trace Pu analysis in small-volume urine bioassays. This method consists of acid digestion, co-precipitation, extraction chromatography and sector-field inductively coupled plasma mass spectrometry (SF-ICP-MS) measurement. Parameters that may influence the analytical performance were studied systematically. This method achieved a high U decontamination factor (3.8 × 10) and the Pu recovery was stable for 20 mL and 100 mL urine bioassays with an average value of 72.7 ± 5.5%. The limits of detection for Pu, Pu and Pu by the method were 0.016 fg mL, 0.016 fg mL and 0.019 fg mL for 20 mL urine samples and 0.003 fg mL, 0.002 fg mL and 0.003 fg mL for 100 mL urine samples, respectively. Considering the small volume of urine employed in this study, the absolute detection limits of the method were comparable or even better than those measured with thermal ionization mass spectrometry and accelerator mass spectrometry. All procedures for 20 mL and 100 mL urine bioassays were completed in 9.5 h and 11 h, respectively, and analysis of 10 samples could be finished within one day. With the considerably low detection limits of Pu isotopes and high sample throughput, this method would be a promising tool for the quick response to radiological emergencies and for rapid screening of unexpected occupational exposures of workers involved in the future FDNPP reactor decommissioning operations.