金丝/金粉280000元/kgCas号7440-57-5分子式Au分子量196.97质量标准品级GradeIIIIII主金属含量（%）99.99999.9999.95杂质含量不大于（%）Pt0.00005Pd0.000050.0050.02Ag0.00030.0050.02Cu0.000050.0020.015Fe0.000050.0020.003Ni0.000050.0003Al0.00005Pb0.000050.0010.003Mn0.000050.0003Cr0.000050.0003Mg0.000050.003Sn0.000050.001Si0.00010.005Zn0.00005Bi0.00050.0020.002Sb0.000050.0010.002As0.000050.003Be0.00005Ca0.00005杂质总量不大于（%）0.0010.010.05)