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  • isotopic
  • It is possible for some of the Cr(III) to convert into Cr(VI) during sample preparation, and, to ascertain the amount of Cr(III) that was not originally present in the sample, one can add isotopic spikes of both Cr(III) and Cr(VI), each enriched in a different isotope of chromium. (iberlibro.com)
  • The stable isotope results also show isotopic variations due to elevation differences among the collection points. (unt.edu)
  • results
  • The stable isotope ({delta}D/{delta}{sup 18}O) results record seasonal variations in precipitation as the weather patterns shift from sources in the Pacific Ocean to sources in the Gulf of Mexico. (unt.edu)
  • basis
  • The table below lists certified values for CNC-1, expressed on a dry mass basis. (gc.ca)
  • All listed values are expressed on a dry mass basis. (gc.ca)
  • amount
  • Unlike the popular, related method of standard addition, which usually relies on extensive analytical response (peak area or signal intensity), isotope dilution uses intensive response: the isotope amount ratio. (iberlibro.com)
  • study
  • Precipitation collectors were installed at 14 locations on the Pajarito Plateau and surrounding areas to study variations in chemistry, stable isotopes and tritium for the years 1990 to 1993. (unt.edu)