Includes 100ug/ml: Ag, Al, As, B, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe,  Mg, Mn, Mo, Na, Ni, Pb, Sb, Se,  Ti, Tl, V, Zn 
               1000ug/ml: k
               50ug/ml: Si
at specified concentrations in dil HNO3/tr HF