Speciation and Redox Chemistry of Selenium and Arsenic in Wetland Soils and Sediments.

174 Pages·2017·5.98 MB·English

by  Patrick Henri Masscheleyn

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LSU Historical Dissertations and Theses Graduate School
1990
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Patrick Henri Masscheleyn
Louisiana State University and Agricultural & Mechanical College
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Masscheleyn, Patrick Henri, "Speciation and Redox Chemistry of Selenium and Arsenic in Wetland Soils
and Sediments." (1990). LSU Historical Dissertations and Theses. 5076.
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Order Number 9123219
Speciation and redox chemistry of selenium and arsenic in
-wetland soils and sediments
Masscheleyn, Patrick Henri* Ph.D.
The Louisiana State University and Agricultural and Mechanical Col., 1990
UM-I
300 N. Zeeb Rd.
Ann Aibor, MI 48106
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SPECIATION AND REDOX CHEMISTRY OF SELENIUM AND ARSENIC
IN WETLAND SOILS AND SEDIMENTS
A Dissertation
Submitted to the Graduate Faculty of the
Louisiana State University and
Agricultural and Mechanical College
in partial fulfillment of the
requirements for the degree of
Doctor of Philosophy
The Department of Marine Sciences
by
Patrick H. Masscheleyn
Agricultural Chemistry Engineer, 1985
Engineer in Environmental Sanitation, 1987
State University of Ghent, Belgium
December 1990
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ACKNOWLEDGEMENTS
I wish to express my sincere appreciation to Dr. W.H. Patrick, Jr.,
Boyd Professor of Marine Sciences, and Director of the Laboratory for
Wetland Soils and Sediments, for his guidance throughout the course of
my graduate studies at the Louisiana State University. His experience
and suggestions were invaluable, and contributed insights that are
reflected in this work.
Special appreciation is expressed to Dr. R.D. Delaune, for his
assistance and many helpful suggestions throughout this study.
Special thanks are also extended to my committee: Dr. W.H. Patrick,
Jr., Dr. J.S. Hanor, Dr. R.D. Delaune, Dr. R.P. Gambrell, Dr. E.N.
Lambremont, Dr. I.A. Mendelssohn, and Dr. S.P. Meyers, for their
academic expertise and review of the manuscript.
I also would like to thank everyone in the Laboratory for Wetland
Soils and Sediments, for their friendship and support during my three-
year stay at Louisiana State University. Special thanks go to Mr. J.H.
Pardue for reviewing and carefully editing many parts of this
manuscript.
Finally, heartful thanks go to my wife, Elly, for her love and
understanding, which enabled me to continue during times when the unique
nature of selenium and arsenic compounds would have discouraged even the
most avid researcher.
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TABLE OF CONTENTS
Page
ACKNOWLEDGEMENTS ............................................... ii
TABLE OF CONTENTS .............................................. iii
LIST OF TABLES ................................................ vi
LIST OF FIGURES ........................................ vii
ABSTRACT ........................................................ ix
INTRODUCTION
Sources of arsenic and selenium ................................ 1
Importance of arsenic and selenium speciation .................. 3
Research objectives ............................................ 7
References ..................................................... 10
CHAPTER I. Selenium speciation in aqueous solutions using a hydride
generation atomic absorption spectrophotometry technique.
Abstract ....................................................... 14
Introduction ................................................... 15
Materials and Methods .......................................... 17
Analytical performance of the technique ........................ 26
Selenium speciation in sediment water extracts .................. 27
References ..................................................... 30
CHAPTER II. Arsenic speciation using a pH selective hydride generation/
separation technique followed by atomic absorption spectrophotometry
detection.
Abstract ....................................................... 32
Introduction ................................................... 33
Materials and methods .......................................... 35
Results and discussion ...................................... 40
Summary and conclusion............................................ 48
References ..................................................... 49
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