Free Iron Determination in Soil by Flame Atomic Absorption Spectrometry

ZHANG Sui’an; YANG Zhongrui; DUAN Yuyu; YANG Kaiqi; HU Zhijie; YANG Chun; HOU Sha

doi:10.15898/j.ykcs.202305110067

Rock and Mineral Analysis > 2024 > 43(4): 614-621. > DOI: 10.15898/j.ykcs.202305110067

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

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Free Iron Determination in Soil by Flame Atomic Absorption Spectrometry

ZHANG Sui’an^{1, 2,},
YANG Zhongrui^{1, 2},
DUAN Yuyu^{1, 2},
YANG Kaiqi^{1, 2},
HU Zhijie^{1, 2},
YANG Chun^{1, 2},
HOU Sha^{1, 2}

1.
Shaanxi Institute of Geological Survey Experiment Center, Xi’an 71000, China
2.
Ecological Environmental Damage Identification and Assessment Center, Xi’an 71000, China

More Information

Received Date: May 10, 2023
Revised Date: May 29, 2024
Accepted Date: June 20, 2024
Available Online: July 24, 2024

Abstract

ABSTRACT

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 (3σ) of this method is 0.05g/kg, the quantification limit is 0.20g/kg, the linear correlation coefficient of the standard curve is 0.9995, the precision (RSD, n=6) is 1.95%−3.76%, and the standard error is less than 5%, which meets the analysis requirements of soil investigation. It can be widely applied to the analysis of soil and sediment samples in soil investigation.
- soil,
- free iron,
- flame atomic absorption spectrometry,
- sodium citrate solution,
- sodium bicarbonate solution

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References (33)

References

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