... 0.0005 b.High purity Tellurium(Te 99.999%)The total content of Ag ,Al,Cd,Cu,Fe,Mg,Ni,Pb,Se and Sn is ... ,Cd,Cu,Fe,Mg,Ni,Pb,Se and Sn is below 1ppm;d.Ultra High purity Tellurium(Te 99.99999%)The total content of Ag ... ,Al,Cd,Cu,Fe,Mg,Ni,Pb,Se and Sn is ...