Agilent/ Varian Environmental Calibration Standard 25 components: Ca 1000ug/ml ; Fe 1000ug/ml ; K 1000ug/ml ; Mg 1000ug/ml ; Na 1000ug/ml ; Ag 10ug/ml ; Al 10ug/ml ; As 10ug/ml ; Ba 10ug/ml ; Be 10ug/ml ; Cd 10ug/ml ; Co 10ug/ml ; Cr 10ug/ml ; Cu 10ug/ml ; Mn 10ug/ml ; Mo 10ug/ml ; Ni 10ug/ml ; Pb 10ug/ml ; Sb 10ug/ml ; Se 10ug/ml ; Tl 10ug/ml ; V 10ug/ml ; Zn 10ug/ml ; Th 10ug/ml ; U 10ug/ml in HNO3 10%