Download - 土壤有機質 (soil organic matter,SOM)
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土壤有機質(soil organic matter,SOM)
SOM的含量背景SOM在土壤中的功用、組成、構造SOM與無機土壤組成的相互關係SOM與金屬和有機污染物間對環境問題的重要性
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零電點 (point of zero charge)=等電點(isoelectric point):在一有 H+ 、 OH-及其他離子存在的系統中,經由表面之化學作用如吸附等,而使懸浮顆粒之表面電荷為中性,此時之 pH值稱之為等電點。
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SOM能提供緩衝容量
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腐植質與金屬相互作用
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PZC值之相關訊息 ( 在一般土壤偏鹼的環境 )
PZC土壤 表面電荷 表面吸附 離子交換
低 表土、 SOM 負電 陽離子 CEC大
高 底土、黏土、氧化物 正電 陰離子 AEC大
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