Cao Rui, Aer Buji, Li Jiang, Xie Yuyan, Li Haitao, Yang Hong
Resources and environment department, Xichang University, Xichang, 615000, Sichuan, China.
Sci Rep. 2025 Jul 2;15(1):22490. doi: 10.1038/s41598-025-06435-6.
Rare earth elements are widely used due to their distinctive magnetic, optical and electrical properties. As a consequence, they inevitably enter the environment, potentially posing a threat to human health through the food chain. This experiment sought to investigate the impact of compost made by kiwifruit branches and sheep manure on the lanthanum (La) and cerium (Ce) in soils. The concentration of La and Ce in different state was detected, employing the Tessier's method. The result indicated that, the proportions of La and Ce in the effective state, comprising exchangeable state, Bound to Carbonates state, and Bound to Iron and Manganese oxides state, were found to be markedly decreased; the conversion occurred predominantly between the 14th and 21st day after compost added. It was thus demonstrated that compost markedly accelerated the conversion of La and Ce from their effective state to a stable state; Furthermore, the effect was found to be proportionate to the quantity of compost added, with higher ratios yielding more pronounced outcomes. The effect is better with more compost for soil environment remediation, while a compost ratio of 10% can be selected for agricultural cultivation and cost control.
稀土元素因其独特的磁、光和电性能而被广泛使用。因此，它们不可避免地进入环境，有可能通过食物链对人类健康构成威胁。本实验旨在研究猕猴桃枝条与羊粪制成的堆肥对土壤中镧（La）和铈（Ce）的影响。采用 Tessier 方法检测不同形态下 La 和 Ce 的浓度。结果表明，有效态（包括可交换态、碳酸盐结合态和铁锰氧化物结合态）中 La 和 Ce 的比例显著降低；这种转化主要发生在添加堆肥后的第 14 天至第 21 天之间。由此证明，堆肥显著加速了 La 和 Ce 从有效态向稳定态的转化；此外，发现该效果与添加的堆肥量成比例，比例越高效果越明显。对于土壤环境修复，堆肥量越多效果越好，而对于农业种植和成本控制，可选择 10%的堆肥比例。
