15 components: Al 50 ug/ml, As 50 ug/ml, Ba 50 ug/ml, Cd 50 ug/ml, Co 50 ug/ml, Cr 50 ug/ml, Cu 50 ug/ml, Mn 50 ug/ml, Mo 50 ug/ml, Ni 50 ug/ml, Pb 50 ug/ml, Se 50 ug/ml, Sr 50 ug/ml, Zn 50 ug/ml, K 500 ug/ml in 5% HNO₃