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本文提出用ＥＤＴＡ—Ｎａ２预处理阴离子交换膜，同时提取土壤Ｐ、Ｆｅ和Ｎ元素的方法。结果表明，其测定值可以反映土壤有效Ｐ、有效Ｆｅ和有效Ｎ的释放速率。
In this paper, the method of pretreating anion exchange membrane with EDTA-Na2 and simultaneously extracting P, Fe and N from soil was proposed. The results show that the measured values can reflect the effective P, available Fe and available N release rate.