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研究开发了一种硒的循序偏提取步骤，将地球化学样品中的硒选择性地循序提取到六个“操作上”定义的相态中：水溶性硒（水提取）；吸附在氧化矿物和粘土矿物上配位可交换的亚硒酸根离子（０．１ｍｏｌ／ＬＫＨ２ＰＯ４提取）；与有机质结合的硒（０．１ｍｏｌ／ＬＮａ４Ｐ２Ｏ７提取）；与铁锰铝氧化物和碳酸盐结合的硒（４．０ｍｏｌ／ＬＨＣｌ提取）；硫化物中的硒（ＫＣｌＯ３＋浓ＨＣｌ提取）；硅酸盐残渣中以副矿物和被硅质包裹的硒微粒存在的硒（ＨＦ＋ＨＮＯ３＋ＨＣｌＯ４强混合酸溶解）。对提取步骤的可行性和实用性作了详细的讨论。
A selenium step-by-step extraction procedure has been developed to sequentially select selenium in geochemical samples into six “on the operation” defined phases: water-soluble selenium (water extraction); adsorption on oxidized minerals and Exchangeable selenite ion (extracted with 0.1 mol / L KH2PO4); organic selenium (0.1 mol / L Na4P2O7); selenium (4) combined with Fe-Mn-Al oxides and carbonate . Selenium in the sulfide (KClO3 + concentrated HC1 extract); selenium in the silicate residue (soluble in HF + HNO3 + HClO4 mixed solution). The feasibility and practicability of the extraction steps are discussed in detail.