impurity

Definitions

im- (not) + pur (clean) + -ity (state/thing) = "the state of not being pure," or concretely, the foreign matter that makes something impure. Often countable: the impurities in the water.

Common Collocations

• 1.chemical impurity化学杂质
• 2.trace impurity微量杂质
• 3.remove impurities清除杂质

Example Sentences

• 1.

  The refining process removes impurities from the crude metal.

• 2.

  Even trace impurities can ruin the experiment.