X-ray standing wave study of arsenite incorporation at the calcite surface

Likwan Cheng; Paul Fenter; Neil C. Sturchio; Zhong Zhong; Michael J. Bedzyk

doi:10.1016/S0016-7037(99)00242-2

X-ray standing wave study of arsenite incorporation at the calcite surface

Likwan Cheng, Paul Fenter, Neil C. Sturchio^*, Zhong Zhong, Michael J. Bedzyk

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Abstract

The location and orientation of arsenite incorporated at the CaCO₃ (1014) cleavage surface from a dilute aqueous solution was examined with the X-ray standing wave (XSW) technique. The high coherent fractions measured for As on the (1014) and (0006) Bragg reflections indicate that the arsenite was well ordered in registration with the calcite surface lattice. The As coherent positions show that arsenite was located at the carbonate site. The XSW analysis is consistent with a structural model in which the pyramidal-shaped arsenite ion was oriented with its oxygen base coincident with the carbonate plane, and its As apex pointing outward from the (1014) surface. The structure observed here for arsenite, and previously for selenite, suggests that other pyramidal trioxyanions could be incorporated at the calcite (1014) surface with the same geometry.

Original language	English (US)
Pages (from-to)	3153-3157
Number of pages	5
Journal	Geochimica et Cosmochimica Acta
Volume	63
Issue number	19-20
DOIs	https://doi.org/10.1016/S0016-7037(99)00242-2
State	Published - Oct 1999

ASJC Scopus subject areas

Geochemistry and Petrology

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title = "X-ray standing wave study of arsenite incorporation at the calcite surface",

abstract = "The location and orientation of arsenite incorporated at the CaCO3 (1014) cleavage surface from a dilute aqueous solution was examined with the X-ray standing wave (XSW) technique. The high coherent fractions measured for As on the (1014) and (0006) Bragg reflections indicate that the arsenite was well ordered in registration with the calcite surface lattice. The As coherent positions show that arsenite was located at the carbonate site. The XSW analysis is consistent with a structural model in which the pyramidal-shaped arsenite ion was oriented with its oxygen base coincident with the carbonate plane, and its As apex pointing outward from the (1014) surface. The structure observed here for arsenite, and previously for selenite, suggests that other pyramidal trioxyanions could be incorporated at the calcite (1014) surface with the same geometry.",

author = "Likwan Cheng and Paul Fenter and Sturchio, {Neil C.} and Zhong Zhong and Bedzyk, {Michael J.}",

note = "Funding Information: This work was supported by the Geosciences Research Program, Office of Basic Energy Sciences, U.S. Department of Energy (DOE), under contract W-31-109-Eng-38 to Argonne National Laboratory (ANL). The National Synchrotron Light Source (NSLS) and the Advanced Photon Source (APS) are both supported by DOE. The NSLS beamline X15A is operated by ANL, Northwestern University and NSLS; the APS beamline 12ID-D is operated by the Basic Energy Sciences Synchrotron Radiation Center (ANL). We thank Rich Reeder, Susan Stipp, and two anonymous reviewers for constructive comments and suggestions.",

year = "1999",

month = oct,

doi = "10.1016/S0016-7037(99)00242-2",

language = "English (US)",

volume = "63",

pages = "3153--3157",

journal = "Geochimica et Cosmochimica Acta",

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number = "19-20",

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T1 - X-ray standing wave study of arsenite incorporation at the calcite surface

AU - Cheng, Likwan

AU - Fenter, Paul

AU - Sturchio, Neil C.

AU - Zhong, Zhong

AU - Bedzyk, Michael J.

N1 - Funding Information: This work was supported by the Geosciences Research Program, Office of Basic Energy Sciences, U.S. Department of Energy (DOE), under contract W-31-109-Eng-38 to Argonne National Laboratory (ANL). The National Synchrotron Light Source (NSLS) and the Advanced Photon Source (APS) are both supported by DOE. The NSLS beamline X15A is operated by ANL, Northwestern University and NSLS; the APS beamline 12ID-D is operated by the Basic Energy Sciences Synchrotron Radiation Center (ANL). We thank Rich Reeder, Susan Stipp, and two anonymous reviewers for constructive comments and suggestions.

PY - 1999/10

Y1 - 1999/10

N2 - The location and orientation of arsenite incorporated at the CaCO3 (1014) cleavage surface from a dilute aqueous solution was examined with the X-ray standing wave (XSW) technique. The high coherent fractions measured for As on the (1014) and (0006) Bragg reflections indicate that the arsenite was well ordered in registration with the calcite surface lattice. The As coherent positions show that arsenite was located at the carbonate site. The XSW analysis is consistent with a structural model in which the pyramidal-shaped arsenite ion was oriented with its oxygen base coincident with the carbonate plane, and its As apex pointing outward from the (1014) surface. The structure observed here for arsenite, and previously for selenite, suggests that other pyramidal trioxyanions could be incorporated at the calcite (1014) surface with the same geometry.

AB - The location and orientation of arsenite incorporated at the CaCO3 (1014) cleavage surface from a dilute aqueous solution was examined with the X-ray standing wave (XSW) technique. The high coherent fractions measured for As on the (1014) and (0006) Bragg reflections indicate that the arsenite was well ordered in registration with the calcite surface lattice. The As coherent positions show that arsenite was located at the carbonate site. The XSW analysis is consistent with a structural model in which the pyramidal-shaped arsenite ion was oriented with its oxygen base coincident with the carbonate plane, and its As apex pointing outward from the (1014) surface. The structure observed here for arsenite, and previously for selenite, suggests that other pyramidal trioxyanions could be incorporated at the calcite (1014) surface with the same geometry.

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X-ray standing wave study of arsenite incorporation at the calcite surface

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