leaching
浸出
解説 Definition
leaching は leach（液体によって成分を浸出させる、しみ出させる）の現在分詞・動名詞です。名詞としては、土壌や物質から水などで成分が溶け出す「浸出」を表します。
The process by which water or another liquid passes through soil or a material and dissolves, removes, or carries away nutrients, metals, chemicals, or other soluble substances.
覚え方のコツ Memory Tip
原形 leach「液体で成分を溶かし出す」に -ing を付けた形です。名詞では、水が土壌や材料を通り抜け、養分・金属・化学物質を運び出す「浸出」を指します。leaching of nutrients from soil や chemicals leaching into groundwater という、出発点と流入先の組み合わせで覚えましょう。
Link leaching to the verb leach: liquid moves through a material and carries dissolved substances out of it. Adding -ing creates the participle or gerund leaching; here it functions as a noun naming the process. Picture heavy rain passing through soil and taking nutrients downward with it. Common patterns show both the source and destination: leaching of nutrients from soil and chemicals leaching into groundwater. Unlike ordinary washing, leaching emphasizes substances being dissolved or extracted as liquid travels through a solid material.
例文
Heavy rain caused leaching of nutrients from the soil.
大雨によって土壌から養分が浸出しました。
The engineers tested the material for metal leaching.
技術者たちは、その材料から金属が浸出するかを検査しました。
Careful storage can reduce leaching of chemicals into groundwater.
慎重に保管すれば、化学物質が地下水へ浸出するのを減らせます。
leaching の類義語・関連語
leaching の語源・成り立ち Etymology
古英語 leccan（湿らせる）に由来し、水が物質を通過して成分を溶かし出す過程を指す。ゲルマン祖語 *lakjaną が語根。関連語にleach（浸出する）、lye（灰汁）がある。雨水が土壌の養分を洗い流すイメージが原義そのもの。
Leaching is formed from leach plus the suffix -ing. Leach is historically connected with Old English leccan, meaning “to wet” or “moisten,” and belongs to a Germanic history associated with liquid passing through material. The modern technical meaning focuses on soluble components being dissolved and carried away by water or another liquid, as when rainfall removes nutrients from soil or a laboratory process extracts metal from a substance.
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