基于稳定同位素比值的大气沉降对小麦组织中铅污染的影响。
Effects of Atmospheric Fallout on Lead Contamination of Wheat Tissues Based on Stable Isotope Ratios.
机构信息
School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China.
Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Zhengzhou University of Light Industry, Zhengzhou, China.
出版信息
Bull Environ Contam Toxicol. 2019 Nov;103(5):676-682. doi: 10.1007/s00128-019-02702-1. Epub 2019 Aug 30.
In order to trace the source of Pb pollution in wheat, the contribution ratio of soil and atmospheric fallout source was quantified based on stable isotope ratios. Results showed that the average Pb content of soil was significantly lower than that of fallout, and Pb in the fallout had a higher weak acid fraction than soil. Pb in wheat had a distinct distribution in its tissues and the content of Pb in wheat roots was significantly higher than it in shoots. The Pb/Pb ratio of soil was significantly higher than that in atmospheric fallout (p < 0.05). According to a binary mixing model, the Pb/Pb ratio in wheat roots, leaves, and grains reflect 67%, 65%, and 90% of Pb content contributions from fallout, respectively. This results suggest that fallout Pb was absorbed by wheat leaves and transferred to other organs, and it is important to develop effective strategies to control fallout Pb risks.
为了追溯小麦中 Pb 污染的来源，基于稳定同位素比值定量了土壤和大气沉降源的贡献比例。结果表明，土壤中的平均 Pb 含量明显低于沉降物，沉降物中的 Pb 弱酸部分比例高于土壤。小麦中 Pb 在其组织中有明显的分布，且小麦根部的 Pb 含量明显高于茎叶。土壤中的 Pb/Pb 比值明显高于大气沉降物（p<0.05）。根据二元混合模型，小麦根部、叶片和籽粒中的 Pb/Pb 比值分别反映了沉降物中 Pb 含量的 67%、65%和 90%的贡献。这些结果表明，沉降 Pb 被小麦叶片吸收并转移到其他器官，因此开发控制沉降 Pb 风险的有效策略非常重要。
Zotero 插件