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Cesium-137 (137Cs) is a main product of the nuclear fission. The release of 137Cs can contaminate soil by deposition from the atmosphere. It is critical to develop a high-efficiency way to determinate 137Cs in the soil. To reach it, the sample pretreatment and 137Cs separation from sample matrix is significant. This work focused on the thermal stability of Cs(I) during soil dry ashing and acid solution evaporation. The separation performance of AMP-PAN resin for Cs(I) was investigated through batch and dynamic column experiments. The results reveal that Cs(I) does not loss during soil sample dry ashing (T < 600 °C) and acidic solution evaporation to dryness at 100 °C. The optimal condition for Cs(I) uptake by AMP-PAN resin was pH 0 − 4, and co-existing interference ions had a detrimental effect on Cs(I) adsorption. The adsorption capacity of AMP-PAN resin for Cs(I) was not significantly decreased after irradiation with different γ radiation doses. Cs(I) could be loaded on the column using 0.1 mol/L HNO3 and eluted with 5 mol/L NH4Cl solution with a high recovery of Cs than 90%. These findings shed fresh light on the separation of target element in the analysis of 137Cs in soil. [ABSTRACT FROM AUTHOR]