Determination of 90Sr in contaminated environmental samples by tuneable bandpass dynamic reaction cell ICP-MS.
A rapid method for the extraction and determination of 90Sr in natural water, plant and sediment samples was developed using extraction chromatography and dynamic reaction cell ICP-MS, with O2 as a reaction gas. While isobaric interference from the stable isotope 90Zr was efficiently removed by this method, interferences produced from in-cell reactions with Fe+ and Ni+ required suppression by tuneable bandpass, and in sediments, additional chromatographic separation. Method detection limits were 0.1 pg g-1 (0.5 Bq g-1), 0.04 pg g-1(0.2 Bq g-1), and 3 pg L-1 (5 Bq L-1) for sediments, plant and water samples, respectively, and 90Sr concentrations determined by ICP-MS were in good agreement with activities determined by Cerenkov counting and with certified reference values. While mass spectrometric determination does not rival detection limits achievable by radiometric counting, radiometric determination of 90Sr, a pure beta-emitter, is hindered by long analysis times (several weeks); the comparatively fast analysis achieved via ICP-MS enables same-day preparation and analysis of samples, making this an important technique for the environmental monitoring of areas contaminated by radioactivity.
Taylor
V F
VF
Environmental and Resources Studies, Trent University, Peterborough, ON, K9J 7B8, Canada. vitaylor@trentu.ca
Evans
R D
RD
Cornett
R J
RJ
D002853:Chromatography, Liquid / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D005618:Fresh Water / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods*; D008872:Microwaves; D009532:Nickel / Q000737:chemistry; D017942:Nitric Acid / Q000737:chemistry; D010944:Plants / Q000737:chemistry; D011848:Radioactive Pollutants / Q000032:analysis*; D013326:Strontium Radioisotopes / Q000032:analysis; D014867:Water / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
D004785:Environmental Pollutants; D011848:Radioactive Pollutants; D013326:Strontium Radioisotopes; D014867:Water; D017942:Nitric Acid; D009532:Nickel; D015040:Zirconium; D007501:Iron