Cadmium Isotope Fractionations Induced by Foliar and Root Uptake for Rice Exposed to Atmospheric Particles: Implications for Environmental Source Tracing,Environmental Science & Technology Letters

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Cadmium Isotope Fractionations Induced by Foliar and Root Uptake for Rice Exposed to Atmospheric Particles: Implications for Environmental Source Tracing
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2023-10-07 , DOI: 10.1021/acs.estlett.3c00610
Ruizhi Xia _{1,

2} , Jun Zhou _{1,

2} , Zhen Zeng ₃ , Yufang Sun ₃ , Hongbiao Cui ₄ , Hailong Liu ₅ , Jing Zhou _{1,

2}

Affiliation

Rice roots and leaves were exposed to cadmium (Cd)-contaminated particles in a greenhouse to modify the fractionation during Cd uptake and transport in the plants by using the Bayesian mixing model. The exposure to atmospheric Cd in rice near a copper smelter was determined under the field conditions. The results showed that the leaves directly absorb and accumulate atmospheric Cd in other aboveground tissues by 84–99%. Positive values of Δ^114/110Cd_{Leaf–Particle} (0.08–0.11‰), Δ^114/110Cd_Node–Leaf (0.77–0.81‰), and Δ^114/110Cd_Grain–Leaf (0.39–0.43‰) following foliar exposure as well as Δ^114/110Cd_{Root–Particle} (0.19–0.22‰) and Δ^114/110Cd_Grain–Root (−0.29 to 0.34‰) following root exposure suggested that particles released heavy isotopes. The roots and leaves preferentially retained light isotopes and transported heavy isotopes upward. The Cd isotope fractionations in the plant were constant under both root and foliar exposures at two dosages. The results were used to correct the parameters in the isotope mixing models and to trace the source of atmospheric Cd in rice tissues in the field. Both models of isotope mixing and mass balance suggested 50–63% Cd deposition on the grains. This study provides a theoretical basis for tracing the source of Cd isotopes in plants.

中文翻译：

暴露于大气颗粒的水稻叶和根吸收引起的镉同位素分馏：对环境源追踪的影响

将水稻根和叶暴露在温室中的镉 (Cd) 污染颗粒中，利用贝叶斯混合模型修改植物吸收和运输镉过程中的分馏。在现场条件下测定了铜冶炼厂附近稻米中镉的暴露量。结果表明，叶片直接吸收大气中的Cd，并在其他地上组织中积累84%~99%。叶面处理后Δ ^114/110 Cd_叶-颗粒(0.08–0.11‰)、Δ ^114/110 Cd_节–叶(0.77–0.81‰) 和 Δ ^114/110 Cd_粒–叶(0.39–0.43‰)的正值暴露以及根部暴露后的Δ ^114/110 Cd_根-颗粒(0.19–0.22‰) 和 Δ ^114/110 Cd_{颗粒-根(-0.29 至 0.34‰) 表明颗粒释放了重同位素。}根和叶优先保留轻同位素，向上输送重同位素。在两种剂量的根部和叶部暴露下，植物中的镉同位素分馏是恒定的。结果用于校正同位素混合模型中的参数，并追踪田间水稻组织中大气镉的来源。同位素混合和质量平衡的两种模型都表明颗粒上有 50-63% 的镉沉积。该研究为植物中Cd同位素的来源溯源提供了理论依据。

更新日期：2023-10-07

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