ICPMS Tuning Solution 250 mL certified reference material. Set in a nitric acid matrix for stability. This standard is traceable to NIST and manufactured in accordance with stringent Quality Assurance guidelines. Contains 10 ppb Be, 5 ppb Co, 5 ppb Mn, 2 ppb Ce, 2 ppb In and 2 ppb Bi, and 2ppb U for ICPMS-2030LF mass adjustment procedure in 5% v/v nitric acid. Up to four year expiration date in the sealed TCT bag and up to an additional year after removed from the package. Undiluted tune solution - no sample prep required.