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土壤中的铁(以Fe_2O_3计)在1～8%左右。在土壤的原生矿物中一部分存在于铁镁硅酸盐矿物中,另一部分以氧化物状态存在于赤铁矿、钛铁矿及磁铁矿中,在次生矿物中主要是铁的水化氧化物如褐铁矿、针铁矿等,此外还有少量络合态、交换态和水溶态的铁。土壤全铁的测定通常采用重铬酸钾滴定法和邻菲啰啉光度法,或采用原子吸收和等离子光谱等方法,但尚来见到用铁离子选择性电极法的报导,本文报告用我们研制的PVC Fe(Ⅲ)离子选择性电极研究测定全铁的方法与结果。一实验方法原理:土壤用碱式盐熔融,使土壤中全部铁呈
Iron in the soil (calculated as Fe 2 O 3) is about 1 to 8%. Some of the primary minerals in the soil are present in the ferromagnesium silicate minerals while the other is present in the form of oxides in the hematite, ilmenite and magnetite. The secondary minerals are mainly hydrated and oxidized Things such as limonite, goethite, etc., in addition to a small amount of complexation, exchangeable and water-soluble iron. Determination of soil total iron usually potassium dichromate titration and phenanthroline spectrophotometry, or by atomic absorption and plasma spectroscopy and other methods, but still see the use of ferric ion selective electrode method reported, this report uses our Developed PVC Fe (Ⅲ) ion selective electrode method for the determination of total iron and results. An experimental principle: the soil with alkaline salt melting, so that all the soil was iron