An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the
United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Google Analytics Dashboard for Nicotine, acetanilide and urea multi-level<sup>2</sup>H-,<sup>13</sup>C- and<sup>15</sup>N-abundance reference materials for continuous-flow isotope ratio mass spectrometry
Nicotine, acetanilide and urea multi-level<sup>2</sup>H-,<sup>13</sup>C- and<sup>15</sup>N-abundance reference materials for continuous-flow isotope ratio mass spectrometry