Index Catalog // ScholarsArchive@OSU

Monitoring redox conditions with redox indicators during microbial reductive dechlorination in microcosms and bioaugmented columns

Creator:: Ruiz-Haas, Peter A.
Abstract:: New methods, sensors, and devices based on redox indicators were developed to monitor redox conditions in anoxic and anaerobic laboratory systems and the subsurface environment. The primary application was monitoring redox conditions during the dechlorination of tetrachioroethene (PCE) to ethene (ETH) in packed columns and microcosm bottles containing an enriched...
Resource Type:: Dissertation
Full Text:: Columns. Abstract approved: James D. Ingle, Jr. New methods, sensors, and devices based on redox

Design and application of a microcomputer automated multielement flame atomic fluorescence instrument

Creator:: Neyzari, Shahrokh Ghaffari
Abstract:: An automated multielement flame atomic fluorescence (AF) spectrometer based on microcomputer control was constructed to determine four elements simultaneously. The instrument employs a multiple exit slit monochromator where the light from various exit slits is directed to a single detector with a mirrored funnel. Each element is excited to fluoresce...
Resource Type:: Dissertation
Full Text:: Design and application of a microcomputer automated

A microcomputer automated anodic stripping voltammetric analyzer for trace heavy metal speciation

Creator:: Dewald, Lamar Robert
Abstract:: An automated instrument based on a single-board microcomputer was developed for use in voltammetric analyses. Operator input of numerous experiment parameters allows any type of voltammetric analysis to be implemented and multiple scans to be run unattended. A three operational amplifier potentiostat is used to control the cell voltage and...
Resource Type:: Dissertation
Full Text:: A microcomputer automated anodic stripping voltammetric

Development and evaluation of sampling techniques, instrumentation, and pyridine derivative reagents for fluorometric determination of chloroform and TCE in water with a portable fluorometer

Creator:: Prayoonpokarach, Sanchai
Abstract:: A novel, portable, filter fluorometer was developed for the determination of chloroform and TCE at environmentally-relevant levels when coupled with improved sampling techniques and reagents. Reagents selective for the TCE or chloroform convert these toxic species into fluorescent species that can be monitored. The fluorometer is based on LED excitation...
Resource Type:: Dissertation
Full Text:: Chloroform and TCE in Water with a Portable Fluorometer Abstract approved: James D. Ingle, Jr. A novel

The development and characterization of miniature spectrometers for measuring the redox status of environmental samples

Creator:: Cantrell, Kevin
Abstract:: A spectrometer, here denoted a Simple, Low-power, Inexpensive. Microcontroller-based or SLIM spectrometer. was developed that exploits the small size and low cost of solid-state electronic devices. This approach results in customizable spectrometers that are considerably less expensive and smaller than traditional instrumentation. The performance of the SLIM spectrometer was evaluated...
Resource Type:: Dissertation
Full Text:: approved: James D. Ingle, Jr. A spectrometer, here denoted a Simple, Low-power, Inexpensive

Fiber optic sensors and spectrometry for the detection of volatile gem-polyhalogenated hydrocarbons

Creator:: Louch, Jeff
Abstract:: A fiber optic fluorometer utilizing a double-fiber optic probe was constructed. The absolute fluorescence signal and effective collection efficiency are approximately one fifth those of typical cuvette fluorometers and agree with those predicted by theory. A quinine sulfate calibration curve shows linearity from a detection limit of 10 pg/mL to...
Resource Type:: Dissertation
Full Text:: Privacy James D. Ingle, Jr. A fiber optic fluorometer utilizing a double-fiber optic probe was

Theoretical and experimental factors affecting the accuracy and precision of atomic absorption measurements

Creator:: Bower, Nathan Wayne
Abstract:: A procedure for evaluating the precision of atomic absorption measurements is presented and applied to 21 elements under varying instrumental conditions. The experimental relative standard deviations (RSD's) in absorbance obtained from repetitive measurements made with a high resolution voltmeter and on-line computer, are compared to those predicted by a recently...
Resource Type:: Dissertation
Full Text:: : J. D. Ingle, Jr. A procedure for evaluating the precision of atomic absorption measurements is

Development of automated on-line ion exchange systems for the determination of chemical speciation of trace metals in natural waters

Creator:: Liu, Yan
Abstract:: An automated on-line ion exchange trace enrichment system has been developed to improve the detection limits of flame atomic absorption (AA) spectrophotometry in the determination of trace metals in natural waters. The sample solution is passed through a column of Chelex-100 chelating resin by a carrier buffer stream delivered from...
Resource Type:: Dissertation
Full Text:: Speciation of Trace Metals in Natural Waters Abstract approved : Redacted for privacy James D. Ingle, Jr

Characterization and applications of polyphenol chemiluminescence reactions and flow cell instrumentation

Creator:: Miller, Robert J. (Robert James), 1933-
Resource Type:: Dissertation
Full Text:: approved: Redacted for Privacy James D. Ingle, Jr. This thesis encompasses the development of direct

Development of trace enrichment techniques for trace metals in natural waters using high pressure liquid chromatography

Creator:: Ambrose, Arthur Sigurd
Abstract:: An on-line trace enrichment (TE) system, based on high pressure liquid chromatogroaphy (HPLC) and flame atomic absorption (AA), has been developed for trace metal analysis. The sample is pumped through a column filled with a cation exchange resin which traps metal ions. The ions are subsequently stripped from the column...
Resource Type:: Dissertation
Full Text:: Chromatography Abstract approved: Redacted for Privacy James D. Ingle, Jr. An on-line trace enrichment (TE

ScholarsArchive@OSU

Monitoring redox conditions with redox indicators during microbial reductive dechlorination in microcosms and bioaugmented columns

Design and application of a microcomputer automated multielement flame atomic fluorescence instrument

A microcomputer automated anodic stripping voltammetric analyzer for trace heavy metal speciation

Development and evaluation of sampling techniques, instrumentation, and pyridine derivative reagents for fluorometric determination of chloroform and TCE in water with a portable fluorometer

The development and characterization of miniature spectrometers for measuring the redox status of environmental samples

Fiber optic sensors and spectrometry for the detection of volatile gem-polyhalogenated hydrocarbons

Theoretical and experimental factors affecting the accuracy and precision of atomic absorption measurements

Development of automated on-line ion exchange systems for the determination of chemical speciation of trace metals in natural waters

Characterization and applications of polyphenol chemiluminescence reactions and flow cell instrumentation

Development of trace enrichment techniques for trace metals in natural waters using high pressure liquid chromatography

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