ICP-OES wavelength calibration solution LabKings alternative for: OEM 661003000015 Element Mix, 500 mL. K @ 500 mg/L;Al, As, Ba, Cd, Cr, Co, Cu, Pb, Mn, Mo, Ni, Se, Sr, Zn @ 50 mg/L,in 5% HNO3 + Tr HF Shelf life: 18 months