化工产品大多需控制其痕量杂质铁含量。
Chemical products often need coned of their trace iron contents as impurity.
铁离子是铁细菌的营养源，除了对化工设备造成的危害外，还影响到人们的感官性状。
Iron ions are the nutrient fountain of iron bacteria. Iron ions not only destroy chemical equipment, but also influence the sense of people.
化工产品大多需控制其痕量杂质铁含量。
Chemical products often need control of their trace iron contents as impurity.
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