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We extend our technique for observing very small concentrations of impuritiesin xenon gas to the problem of krypton detection. We use a conventional massspectrometer to identify the krypton content of the xenon, but we improve thesensitivity of the device by about five orders of magnitude with a liquidnitrogen cold trap. We find that the absolute krypton concentration of thexenon can be inferred from the mass spectrometry measurements, and we identifykrypton signals at concentrations as low as 0.5x10^{-12} mol/mol (Kr/Xe). Thistechnique simplifies the monitoring of krypton backgrounds for WIMP dark mattersearches in liquid xenon.

Detection of krypton in xenon for dark matter applications