ICP-OES Wavelength Calibration Solution Concentrate 15 components: Al 50ug/ml ; As 50ug/ml ; Ba 50ug/ml ; Cd 50ug/ml ; Co 50ug/ml ; Cr 50ug/ml ; Cu 50ug/ml ; Mn 50ug/ml ; Mo 50ug/ml ; Ni 50ug/ml ; Pb 50ug/ml ; Se 50ug/ml ; Sr 50ug/ml ; Zn 50ug/ml ; K 500ug/ml in HNO3 5%