The air purification agent (6) can be bamboo charcoal tablets.

空气净化物（6）可为竹炭粒。

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The effects of adding purifying agent during the process of water purification were studied. The best opportunity for applying purification agent to water during purification process was obtained.

对水质净化过程中投加净化剂的效果进行了研究，得出了在冬春低温低浊季节，水力循环澄清池-快滤池净化过程投加净化剂脱混的最佳选择。

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Some products can have "traces" of thiomersal when the chemical is used during the production process as an antibacterial agent, which is later removed during the purification process.

如果在生产过程中使用硫柳汞作为抗菌剂，然后在净化过程中清除该化学品，有些制品就可有微量硫柳汞。

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The hormone was prepared from human pituitary glands recovered from cadavers, and the absence of rigorous collection guidelines and purification procedures permitted contamination of the formulated drug with the agent that causes Creutzfeldt-Jacob disease, the human equivalent of "mad-cow disease, " or bovine spongiform encephalopathy (BSE).

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