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EXAFs study on arsenic species and transformation in arsenic hyperaccumulator

science china(Life sciences) 2004年第2期47卷 124-129页

作者： HUANG Zechun1, chen tongbin1, LEI Mei1, HU Tiandou2.& HUANG Qifei1 1. {2. of Environmental Remediation, institute of Geographical sciences and Natural Resources Research, chinese academy of sciences, beijing 100101, china 2. laboratory of synchrotron radiation, institute of High energy physics, chinese academy of sciences, beijing 10003., china correspondence should be addressed to chen tongbin 1. laboratory of Environmental Remediation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences 100101 Beijing China 2. Plaboratory of synchrotron {2. Institute of High Energy Physics Chinese Academy of Sciences 100039 Beijing China

synchrotron radiation extended X-ray absorption fine structure (sR EXAFs) was employed to study the transformation of coordination environment and the redox speciation of arsenic in a newly discovered arsenic hyperaccumulator, Cretan brake (Pteris cretica L. var ner-vosa Thunb). It showed that the arsenic in the plant mainly coordinated with oxygen, except that some arsenic coordinated with s as As-GsH in root. The complexation of arsenic with GsH might not be the predominant detoxification mechanism in Cretan brake. Although some arsenic in root presented as As(V) in Na2.AsO4 treatments, most of arsenic in plant presented as As(III)-O in both treatments, indicating that As(V) tended to be reduced to As(III) after it was taken up into the root, and arsenic was kept as As(III) when it was transported to the above-ground tissues. The reduction of As(V) primarily proceeded in the root.

关键词： hyperaccumulator, Cretan brake (Pteris cretica L. var nervosa Thunb), arsenic, species, EXAFs.

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Distributions of arsenic and essential elements in pinna of arsenic hyperaccumulator Pteris vittata L.

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science china(Life sciences) 2005年第1期48卷 18-24页

作者： chen tongbin, HUANG Zechun, HUANG Yuying & LEI Mei {2. of Environmental Remediation, institute of Geographic sciences and Natural Resources Research, chinese academy of sciences, beijing 100101, china {2. of synchrotron radiation, institute of High {{12. physics, chinese academy of sciences, beijing 10003., china laboratory of Environmental Remediation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China laboratory of synchrotron {2. Institute of High Energy Physics Chinese Academy of Sciences Beijing100039 China

The distributions of arsenic and 6 essential elements in the pinna of As hyperaccumulator, Pteris vittata L., were studied using synchrotron radiation X-ray fluorescence (sRXRF). significant correlation between the distribution and mobility of the elements revealed that sRXRF study on the elemental distribution was feasible to inspect the transportations of elements in plants. The distribution of As in the pinna showed that As had great abilities to be transported in xylem vessels and from xylem to mesophyll. The distribution of K, one of the most mobile elements in plants, was similar to that of As, whereas the distributions of Fe and Ca with less mobility in plants were almost opposite to that of As in the pinna.

关键词： hyperaccumulator, chinese brake (Pteris vittata L.), arsenic, element, distribution, sRXRF.

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