Write down the classical five-step sequential extraction approach.
Write down the classical five-step sequential extraction approach.
发布时间：2025-03-07 20:09:45
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答案：【计分规则】: Exchangeable metal ions are removed by extraction with neutral ammonium acetate solution; the carbonate fraction extracted using sodium acetate and acetic acid at pH 5; metal ions bound to oxides are removed by reducing these oxides and solubilising the resultant ferrous and manganous species using hydroxylamine and acetic acid; oxidation of organic matter is achieved using hydrogen peroxide in an acidic medium and the final residue metal fraction solubilised by an HF-HClO4 acid digest.
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