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Title: Reducing Arsenic Concentration in Panax notoginseng via Contaminant Immobilization in Soil Using Fe–Ce Oxide

Abstract

Panax notoginseng (Burk.) F.H. Chen, a precious Chinese medicine, is currently confronted with arsenic (As) contamination in China due to soil pollution. Our previous research demonstrated that Fe(0) and zeolite had certain inhibitory effect on As accumulation in P. notoginseng. To further increase the As immobilization efficiency and to reduce As accumulation in the plant, a synthetic iron material (Fe-Ce oxide, FC) with high As adsorption capacity was tested for As remediation. P. notoginseng was planted in As-contaminated soil when the FC amendment was applied to the soil. The As leaching behavior of the treated soil and As accumulation in P. notoginseng were evaluated. Results showed that FC more effectively immobilized As than Fe(0) and zeolite in soils with high As concentrations. When the FC dosage was 0.5 wt.%, As concentration of P. notoginseng root (the main medicinal part) decreased by 55.8%, and its biomass increased by 54.6%. FC could reduce the non-specifically adsorbed As fraction (F1) and specifically adsorbed As fraction (F2) by 21.8%-30.6% and 4.6%-16.6%, respectively, thus reducing the TCLP (Toxicity Characteristic Leaching Procedure) concentration by 40.6%-67.0%. The finding of iron plaque coating on root and its function as a barrier for As uptake for P. notoginseng wasmore » reported for the first time. The occurrence of iron plaque led to As concentration reduction in the phellem and xylem/phloem by 65.6%-79.7% and 43.2%-70.2%, respectively, thus raising the proportion of As(III) to 75%. This study is of significance in developing As contamination control in P. notoginseng planting areas.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1455282
Report Number(s):
PNNL-SA-130195
Journal ID: ISSN 0047-2425
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Environmental Quality; Journal Volume: 47; Journal Issue: 2
Country of Publication:
United States
Language:
English

Citation Formats

Lin, Longyong, Zhong, Lirong, Yan, Xiulan, and Fei, Yang. Reducing Arsenic Concentration in Panax notoginseng via Contaminant Immobilization in Soil Using Fe–Ce Oxide. United States: N. p., 2018. Web. doi:10.2134/jeq2017.07.0297.
Lin, Longyong, Zhong, Lirong, Yan, Xiulan, & Fei, Yang. Reducing Arsenic Concentration in Panax notoginseng via Contaminant Immobilization in Soil Using Fe–Ce Oxide. United States. doi:10.2134/jeq2017.07.0297.
Lin, Longyong, Zhong, Lirong, Yan, Xiulan, and Fei, Yang. Mon . "Reducing Arsenic Concentration in Panax notoginseng via Contaminant Immobilization in Soil Using Fe–Ce Oxide". United States. doi:10.2134/jeq2017.07.0297.
@article{osti_1455282,
title = {Reducing Arsenic Concentration in Panax notoginseng via Contaminant Immobilization in Soil Using Fe–Ce Oxide},
author = {Lin, Longyong and Zhong, Lirong and Yan, Xiulan and Fei, Yang},
abstractNote = {Panax notoginseng (Burk.) F.H. Chen, a precious Chinese medicine, is currently confronted with arsenic (As) contamination in China due to soil pollution. Our previous research demonstrated that Fe(0) and zeolite had certain inhibitory effect on As accumulation in P. notoginseng. To further increase the As immobilization efficiency and to reduce As accumulation in the plant, a synthetic iron material (Fe-Ce oxide, FC) with high As adsorption capacity was tested for As remediation. P. notoginseng was planted in As-contaminated soil when the FC amendment was applied to the soil. The As leaching behavior of the treated soil and As accumulation in P. notoginseng were evaluated. Results showed that FC more effectively immobilized As than Fe(0) and zeolite in soils with high As concentrations. When the FC dosage was 0.5 wt.%, As concentration of P. notoginseng root (the main medicinal part) decreased by 55.8%, and its biomass increased by 54.6%. FC could reduce the non-specifically adsorbed As fraction (F1) and specifically adsorbed As fraction (F2) by 21.8%-30.6% and 4.6%-16.6%, respectively, thus reducing the TCLP (Toxicity Characteristic Leaching Procedure) concentration by 40.6%-67.0%. The finding of iron plaque coating on root and its function as a barrier for As uptake for P. notoginseng was reported for the first time. The occurrence of iron plaque led to As concentration reduction in the phellem and xylem/phloem by 65.6%-79.7% and 43.2%-70.2%, respectively, thus raising the proportion of As(III) to 75%. This study is of significance in developing As contamination control in P. notoginseng planting areas.},
doi = {10.2134/jeq2017.07.0297},
journal = {Journal of Environmental Quality},
number = 2,
volume = 47,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2018},
month = {Mon Jan 01 00:00:00 EST 2018}
}