第三步(酸洗)：去除金属表面的自由离子、金属残渣、氧化物和其他腐蚀产物。
The Third Step (Acid Wash) is to remove free iron, metallic residues, oxides, and other corrosion products from the surface of the metal.
不溶性氧化物相留存在残渣中。
应用连续浸提技术将土壤中Se划分为5种形态：水溶态、可交换态、酸溶态(碳酸盐及铁锰氧化物结合态)、有机物结合态、残渣态。
Application of sequential extraction technique in soil se into five forms: water soluble, exchangeable, acid soluble (carbonate and manganese oxides), organic matter bound and residual.
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