The standard states that the citric acid-sodium nitrate treatment is the least hazardous for removalof free iron and other metallic contamination and light surface contamination.
该标准声明：柠檬酸-硝酸钠处理在去除游离铁合其他金属污染和轻的表面污染物时，危险性最低。
2
Removalof prion contamination is a complicated matter, with studies showing that cleaning chemistries can decrease or even increase the resistance of prion contamination to steam sterilization.
去除阮病毒的污染是个复杂的事情，研究表明用化学试剂清洗可以降低或者增加阮病毒对蒸汽灭菌的抑制。
3
The biological characteristics of algae, and the prevention and removalof the contamination by algae in the production of barreled mineral water for drinking are described in the paper.