Radioactive cesium (Cs) in the soil represents a severe threat to human health and the environment. Plant uptake is an important pathway for the migration of Cs to the human food chain. It is therefore essential to find effective amendments for reducing the phytoavailability of Cs. In this study, we aimed to evaluate the effectiveness and possible mechanisms of biochar (BC), incinerated sewage sludge ash (ISSA) and zeolite (ZL) on the immobilization of Cs in the contaminated soil. Greenhouse pot experiment was conducted using Napier grass (Pennisetum purpureum) to investigate the effects of BC, ISSA and ZL (10% application rate, w/w) on the soil properties, plant biomass, the accumulation and distribution of Cs in the grass grown on the contaminated soil added with Cs as a rate of 100 mg kg ⁻¹. The results showed that all amendments enhanced the grass growth, with the maximum biomass recorded in the ISSA treatment. The concentrations of Cs in the leaf blade, leaf sheath and root of grass significantly decreased with all amendment applications. Especially the BC application showed the lowest Cs concentration in grass, decreased by up to 95% compared to control (no amended soil). Moreover, the obtained results in terms of pH, cation exchange capacity, surface charge, specific surface area and potassium concentration of amendments and potting soils highlighted the remarkable efficiency of biochar to adsorb Cs and reduce the plant uptake of Cs providing key evidences for Cs immobilization.

土壤中的放射性铯（Cs）对人类健康和环境构成了严重威胁。植物吸收是Cs向人类食物链迁移的重要途径。因此，必须找到有效的修正方法来降低Cs的植物利用率。在这项研究中，我们旨在评估生物炭（BC），焚化的污水污泥灰（ISSA）和沸石（ZL）对Cs固定在污染土壤中的有效性和可能的​​机理。用纳皮尔草（Pennisetum purpureum）进行温室盆栽试验，研究BC，ISSA和ZL（10％施用量，w / w）对土壤，植物生物量，Cs在草中的积累和分布的影响。以100 mg kg ^-1的比例添加Cs的污染土壤。结果表明，所有的改良剂都促进了草的生长，在ISSA处理中记录了最大的生物量。随着所有改良剂的应用，叶片，叶鞘和草根中Cs的浓度均显着降低。特别是BC施用显示草中的Cs浓度最低，与对照（无改良土壤）相比，降低了多达95％。此外，从pH，阳离子交换能力，表面电荷，比表面积和改良剂和盆栽土壤钾浓度方面获得的结果突出了生物炭吸附Cs和减少植物对Cs吸收的显着效率，为固定Cs提供了重要证据。 。