Zinc/ja: Difference between revisions

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 人為的排出と自然排出の割合は20対1である。
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+工業地帯や鉱業地帯を流れる河川の亜鉛濃度は20&nbsp;ppmにもなる。効果的な[[:en:sewage treatment|下水処理]]はこれを大幅に減少させる。例えば[[:en:Rhine|ライン川]]沿いの処理では、亜鉛濃度は50&nbsp;ppbまで低下した。2&nbsp;ppmという低濃度の亜鉛は、魚が血液中に運べる酸素の量に悪影響を与える。
-Zinc in rivers flowing through industrial and mining areas can be as high as 20&nbsp;ppm. Effective [[sewage treatment]] greatly reduces this; treatment along the [[Rhine]], for example, has decreased zinc levels to 50&nbsp;ppb. Concentrations of zinc as low as 2&nbsp;ppm adversely affects the amount of oxygen that fish can carry in their blood.
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