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Exploring the interactions and binding sites between Cd and functional groups in soil DOM using two-dimensional correlation spectroscopy and synchrotron radiation based spectromicroscopies

  • [设施]:上海设施
  • [期刊/会议名称]:Journal of Hazardous Materials
  • [摘要]:Understanding how heavy metals bind and interact in soils is essential for predicting their distributions, reactions and fates in the environment. Here we propose a novel strategy, i.e., combining two-dimensional correlation spectroscopy (2D COS) and synchrotron radiation based spectromicroscopies, for identifying heavy metal binding to functional groups in soils. The results showed that although long-term (23 yrs) organic fertilization treatment caused the accumulation of Cd (over 3 times) in soils when compared to no fertilization and chemical fertilization treatments, it significantly (p < 0.05) reduced the Cd concentration in wheat grain. The 2D COS analyses demonstrated that soil functional groups controlling Cd binding were modified by fertilization treatments, providing implications for the reduced bioavailability of heavy metals in organic fertilized soils. Furthermore, correlative micro X-ray fluorescence spectromicroscopy, electron probe micro-analyzer mapping, and synchrotron-radiation-based FTIR spectromicroscopy analysis showed that Cd, minerals, and organic functional groups were heterogeneously distributed at the micro-scale in soil colloids. Only minerals, rather than organic groups, had a similar distribution pattern with Cd. Together, this strategy has a potential to explore the interactions and binding sites among heavy metals, minerals and organic components in soil.
  • [发表日期]:2017
  • [第一作者]:孙富生
  • [第一作者单位]:南京农业大学
  • [通讯作者]:余光辉
  • [通讯作者单位]:南京农业大学
  • [论文类型]:0
  • [期刊分类]:SCI1区
  • [学科分类]:环境科学_ 生态学
  • [影响因子]:6.06
  • [关键词]:cadmium; soil; long-term fertilization experiment; two-dimensional correlation spectroscopy; synchrotron-radiation-based spectromicroscopy
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