Quality Control Standard 28 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 Si 50 ug/mL, Al, As, Ba, Be, B, Cd, Ca, Cr, Co, Cu, Fe, Pb, Li, Mg, Mn, Mo, Ni, Se, Ag, Na, Sr, Tl, Ti, V, Zn, Sb 100ug/mL each, K 1000ug/mL, stabilized in 5% v/v nitric acid/trace hydrofluoric acid. 125 mL bottle.