As、Hg残留量
arsenic and mercury residues
SO2残留量
SO2 residues
remanent of SO2
SO2 remainder content
the sulphur dioxide residue
八氯二丙醚(S-421)残留量
Octachloro-dipropylether(S421
残留量测定
determination of residue
Determination
determination of residual quantity
多氯联苯残留量
polychlorinated biphenyl residues
二氧化硫残留量
residual SO2
Sulfur dioxide residues
Sulphur Dioxide SO2 residues