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Uptake and transport of Pb across the iron plaque of waterlogged dropwort (Oenanthe javanica DC.) based on micro-XRF and XANES

  • Jian Liu
  • Liqiang LuoEmail author
Regular Article
  • 77 Downloads

Abstract

Background and aim

Iron plaque at the soil-root interface is a key position for uptake of heavy metals by plants. Exploring iron plaque’s role in Pb uptake by edible vegetable roots aids understanding Pb uptake mechanisms and developing methods to reduce Pb accumulation.

Methods

Soil and plant Pb contents were determined. Micro X-ray fluorescence (micro-XRF) determined Fe and Pb distributions in waterlogged and terrestrial Oenanthe javanica DC. roots, and X-ray absorption near-edge spectroscopy (XANES) identified Pb speciation in bulk soil, rhizosphere soil and plant tissues.

Results

Waterlogged O. javanica accumulated more Pb and exhibited a higher Pb transfer factor than terrestrial O. javanica. In waterlogged O. javanica, the iron plaque and epidermis contained the most Fe, while the root vasculature contained the most Pb. In terrestrial O. javanica roots, Fe and Pb had similar distributions. Bulk and rhizosphere soils contained different Pb species, and rhizosphere soil had Pb-humate. For iron plaque, a new Pb complex, Pb-ferrihydrite, was identified. Biologically important groups bound (-S, -COO) and precipitated (-PO4) Pb were identified in plants.

Conclusions

Waterlogged O. javanica root iron plaque and humic acid increase Pb uptake and accumulation. Thus, avoiding O. javanica root iron plaque formation (dry land growth) and growing in low-humic soil reduce Pb uptake and entry into the food chain.

Keywords

Vegetable Oenanthe javanica DC. Iron plaque Lead (Pb) Uptake 

Abbreviations

DCB

dithionite-citrate-bicarbonate

micro-XRF

micro X-ray fluorescence

XAS

X-ray absorption spectroscopy

XANES

X-ray absorption near-edge spectroscopy

EXAFS

Extended X-ray absorption fine structure spectroscopy

LMWOAs

low-molecular-weight organic acids

XRF

X-ray fluorescence

SSRF

Shanghai Synchrotron Radiation Facility

ICP-MS

inductively coupled plasma mass spectrometry

ICP-OES

inductively coupled plasma optical emission spectroscopy

HA

humic acid

HNS

Hoagland’s nutrient solution

Notes

Acknowledgments

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFC0600603), the National Natural Science Foundation of China (Grant No. 20775018, 41877505 and 41201527), the National High Technology Research and Development Program of China (Grant No. 2007AA06Z124) and the Project of China Geological Survey (Grant No. DD20160340). The Shanghai Synchrotron Radiation Facility is thanked for provision of beam time at beamlines 15 U1 and 14 W1. In addition, we thank associate Professor Yating Shen, Dr. Yuan Zeng and Dr. Xiaoyan Sun for their technical support during the experiments and data collection.

Compliance with ethical standards

Declarations of interest

None

Supplementary material

11104_2019_4106_MOESM1_ESM.docx (28 kb)
ESM 1 (DOCX 28.2 kb)

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.National Research Center of GeoanalysisBeijingPeople’s Republic of China

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