... by time-sharing at trace level (ppt), such as As,Se,Hg,Sb.. Features:1,Simultaneously determine two elements at two ... by time-sharing at trace level (ppt), such as As,Se,Hg,Sb,Pb,Cd,Te,Sn,Bi,Ge,Zn.2 ... level gaseous mercury determination2,Parts and operation system for As, Se, Sb , and Hg speciation determination3,Ultra-trace level determination for ...