Interference Check Standard 4 for EPA 200.7 is a certified reference material traceable to NIST and manufactured in accordance with stringent quality assurance guidelines. One year expiration date. COA and MSDS are included.
Contains Na 2500ug/mL, Al 3000ug/mL, Mg 7500ug/mL, Fe 12500ug/mL, Ca 15000ug/mL, stabilized in 3% v/v nitric acid. 125 mL bottle.