Citation: | ZHANG Sui’an,YANG Zhongrui,DUAN Yuyu,et al. Free Iron Determination in Soil by Flame Atomic Absorption Spectrometry[J]. Rock and Mineral Analysis,2024,43(4):614−621. DOI: 10.15898/j.ykcs.202305110067 |
Free iron oxide in soil is a product of weathering, migration, and transformation of soil parent materials. Its form, activation, and aging degree can reflect the soil forming process and environment. It is also the main carrier of soil variable charge and an important mineral bonding substance in soil, which can directly reflect the formation environment, formation process, and climate change of the soil. Therefore, accurate determination of free iron in soil has important practical significance. At present, free iron is measured using ultraviolet spectrophotometry. The experimental process for free iron is long, requiring the reduction of high valent iron to low valent iron. In addition, it requires a color development time of up to 24h, which is time-consuming and cannot meet the needs of large-scale sample testing. Flame atomic absorption spectrometry method is used to determine free iron in soil, and the influence of experimental conditions on the determination of free iron is studied. By optimizing the amount of sodium bicarbonate, reaction temperature, reaction time, and cleaning times during the sample determination process, a method for determining free iron in soil is established. The optimal experimental conditions are determined as follows: weigh 0.5g of sample, add 20mL of sodium citrate solution and 2mL of sodium bicarbonate solution, and cleaned once each at a reaction temperature of 75−80℃ for 15min. The detection limit (3