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Full-Text Articles in Physical Sciences and Mathematics
Determination Of Lead In Wine And Rum Samples By Flow Injection-Hydride Generation-Atomic Absorption Spectrometry, L Elci, Z Arslan, Jf Tyson
Determination Of Lead In Wine And Rum Samples By Flow Injection-Hydride Generation-Atomic Absorption Spectrometry, L Elci, Z Arslan, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Determination Of Methylmercury And Inorganic Mercury In Water Samples By Slurry Sampling Cold Vapor Atomic Absorption Spectrometry In A Flow Injection System After Preconcentration On Silica C-18 Modified, Sr Segade, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Determination Of Inorganic Mercury And Total Mercury In Biological And Environmental Samples By Flow Injection-Cold Vapor-Atomic Absorption Spectrometry Using Sodium Borohydride As The Sole Reducing Agent, Sr Segade, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
On-Line Matrix Removal Of Lead For The Determination Of Trace Elements In Forensic Bullet Samples By Flow Injection Inductively Coupled Plasma-Mass Spectrometry, Er Yourd, Jf Tyson, Rd Koons
On-Line Matrix Removal Of Lead For The Determination Of Trace Elements In Forensic Bullet Samples By Flow Injection Inductively Coupled Plasma-Mass Spectrometry, Er Yourd, Jf Tyson, Rd Koons
Chemistry Department Faculty Publication Series
No abstract provided.
Flow Injection Solid Phase Extraction With Chromosorb 102: Determination Of Lead In Soil And Waters By Flame Atomic Absorption Spectrometry, L Elci, Z Arslan, Jf Tyson
Flow Injection Solid Phase Extraction With Chromosorb 102: Determination Of Lead In Soil And Waters By Flame Atomic Absorption Spectrometry, L Elci, Z Arslan, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Determination Of Calcium, Magnesium And Strontium In Soils By Flow Injection Flame Atomic Absorption Spectrometry, Z Arslan, Jf Tyson
Determination Of Calcium, Magnesium And Strontium In Soils By Flow Injection Flame Atomic Absorption Spectrometry, Z Arslan, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Determination Of Chloride By Flow Injection Spectrophotometry With Membrane Reagent Introduction, Sj Chalk, Jf Tyson
Determination Of Chloride By Flow Injection Spectrophotometry With Membrane Reagent Introduction, Sj Chalk, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Flow Injection Determination Of Selenium By Successive Retention Of Se(Iv) And Tetrahydroborate(Iii) On An Anion-Exchange Resin And Hydride Generation Electrothermal Atomization Atomic Absorption Spectrometry With In-Atomizer Trapping - Part 1. Method Development And Investigation Of Interferences, Pe Carrero, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Effect Of Sample Volume On The Limit Of Detection In Flow Injection Hydride Generation Electrothermal Atomic Absorption Spectrometry, Jf Tyson, Ri Ellis, Sa Mcintosh, Cp Hanna
Effect Of Sample Volume On The Limit Of Detection In Flow Injection Hydride Generation Electrothermal Atomic Absorption Spectrometry, Jf Tyson, Ri Ellis, Sa Mcintosh, Cp Hanna
Chemistry Department Faculty Publication Series
No abstract provided.
Determination Of Se In Urine By Flow Injection Hydride Generation Electrothermal Atomic Absorption Spectrometry With In-Atomizer Trapping, Jf Tyson, Ng Sundin, Cp Hanna, Sa Mcintosh
Determination Of Se In Urine By Flow Injection Hydride Generation Electrothermal Atomic Absorption Spectrometry With In-Atomizer Trapping, Jf Tyson, Ng Sundin, Cp Hanna, Sa Mcintosh
Chemistry Department Faculty Publication Series
No abstract provided.
Determination Of Selenium By Atomic Absorption Spectrometry With Simultaneous Retention Of Selenium(Iv) And Tetrahydroborate(Iii) On An Anion-Exchange Resin Followed By Flow Injection Hydride Generation From The Solid Phase, Pe Carrero, Jf Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
On-Line Dilution For Icp-Ms With A Flow Injection Recirculating Loop Manifold, Jf Tyson, Hh Ge, Er Denoyer
On-Line Dilution For Icp-Ms With A Flow Injection Recirculating Loop Manifold, Jf Tyson, Hh Ge, Er Denoyer
Chemistry Department Faculty Publication Series
No abstract provided.
Use Of Surfactant In The Determination Of Arsenic By Flow Injection Hydride Generation Atomic Absorption Spectrometry, Julian Tyson, Robert Ellis
Use Of Surfactant In The Determination Of Arsenic By Flow Injection Hydride Generation Atomic Absorption Spectrometry, Julian Tyson, Robert Ellis
Chemistry Department Faculty Publication Series
The possible benefits of the addition of an anionic surfactant, didodecyldimethylammonium bromide, in the determination of arsenic, by flow injection hydride generation atomic absorption spectrometry using a flame-heated quartz tube atomizer, were studied in the light of previous reports concerning the effects of surfactants on chemical vapor generation procedures. Concentrations of arsenic between 5 and 30 μg 1-1 were used. Calibrations in the presence and absence of the surfactant in the sample solution were not significantly different, either for the case where vesicles were formed in the presence of the analyte or where they were preformed in the surfactant solution …
Flow Injection Determination Of Mercury With Preconcentration By Amalgamation On A Gold-Platinum Gauze By Inductively Coupled Plasma Mass Spectrometry, Ebenezer Debrah, Eric R. Denoyer, Julian Tyson
Flow Injection Determination Of Mercury With Preconcentration By Amalgamation On A Gold-Platinum Gauze By Inductively Coupled Plasma Mass Spectrometry, Ebenezer Debrah, Eric R. Denoyer, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
The Use Of Nafion Dryer Tubes For Moisture Removal In Flow Injection Chemical Vapor Generation Atomic Absorption Spectrometry, Ng Sundin, Julian Tyson, C P. Hanna, S A. Mcintosh
The Use Of Nafion Dryer Tubes For Moisture Removal In Flow Injection Chemical Vapor Generation Atomic Absorption Spectrometry, Ng Sundin, Julian Tyson, C P. Hanna, S A. Mcintosh
Chemistry Department Faculty Publication Series
A significant problem with flow injection chemical vapor generation atomic absorption spectrometry is a loss of sensitivity and blockage of transfer lines due to excessive moisture transported to the atom cell or lodged in the transfer line. A Nafion dryer tube was used to remove moisture from the wet carrier gas stream. The hygroscopic Nafion membrane removed water at 1.7 mg/min at an efficiency of 95 ± 4% when SnCl2 was used as the reductant. When 0.4% (m/v) borohydride was used as the reductant, 2.3 mg/min of water was removed at an efficiency of 91 ± 3%. No measurable change …
Evaluation Of The Precision Of The Flow Injection Doublet Peak, Julian Tyson, Rt Echols
Evaluation Of The Precision Of The Flow Injection Doublet Peak, Julian Tyson, Rt Echols
Chemistry Department Faculty Publication Series
The factors affecting the precision of the flow injection doublet peak method are discussed with particular reference to the contribution from the uncertainty associated with the calibration procedure. A single-line flow injection manifold was used in which the concentration gradients were generated by alternating helical reactors and the reaction products were monitored by a simple detector incorporating diodes as light source and intensity transducer. The reactions between lanthanum and Methyl Thymol Blue and between sodium hydroxide and hydrochloric acid in the presence of Bromothymol Blue were used. Optimization studies involved the method of steepest ascent, two figures of merit (the …
Comparison Of Mixing Devices For Flow Injection Determinations Based On Doublet Peak Formation, Julian Tyson, Rt Echols
Comparison Of Mixing Devices For Flow Injection Determinations Based On Doublet Peak Formation, Julian Tyson, Rt Echols
Chemistry Department Faculty Publication Series
The well-stirred tank model accurately describes the separation (At) between flow-injection doublet peaks and has been found to be applicable to a variety of mixing devices that do not contain moving parts such as a magnetic follower. The reaction between lanthanum(III) and methyl thymol blue was used as a model reaction for a comparison study of mixing devices. Column and open-tubular reactors were included in the study. Mixing devices were compared on the basis of the straight line fit of At versus the natural logarithm of the concentration of injected La(III). The linearity of the At-ln[La(III)] plots was equivalent for …
Solid-State Microprocessor Controlled Detector For Doublet Peak Measurements In Flow Injection Analysis, Julian Tyson, A Murfin, M Conboy, M K. Carroll
Solid-State Microprocessor Controlled Detector For Doublet Peak Measurements In Flow Injection Analysis, Julian Tyson, A Murfin, M Conboy, M K. Carroll
Chemistry Department Faculty Publication Series
No abstract provided.
Flow Injection Reagent Introduction By Supported Liquid And Nafion Membranes: Determination Of Phosphate, Stuart J. Chalk, Julian Tyson
Flow Injection Reagent Introduction By Supported Liquid And Nafion Membranes: Determination Of Phosphate, Stuart J. Chalk, Julian Tyson
Chemistry Department Faculty Publication Series
The use of membrane tubing for the introduction of reagents for the determination of phosphate in waters by flow injection analysis was studied. The use of membranes eliminates the need for confluence points in the design of flow injection manifolds. This increases the sensitivity of the manifold by providing a sufficient reagent excess for the reaction without diluting the sample. Methods for the introduction of acid, molybdate and hydrazine were devised for the determination of phosphate by the Molybdenum Blue method. Several membranes were examined and Nafion and Accurel (microporous polypropylene) were found to be most useful. Molybdate introduction was …
Flow Injection Systems For Directly Coupling On-Line Digestions With Analytical Atomic Spectrometry Part 2. Reactions In A Microwave Field, Julian Tyson, Thomas J. Gluodenis Jr.
Flow Injection Systems For Directly Coupling On-Line Digestions With Analytical Atomic Spectrometry Part 2. Reactions In A Microwave Field, Julian Tyson, Thomas J. Gluodenis Jr.
Chemistry Department Faculty Publication Series
A flow injection system incorporating a stopped-flow microwave-heated reactor was constructed for the preparation of solutions for subsequent analysis by atomic spectrometric techniques. Slurry samples were injected into the manifold and transported into a glass reactor mounted inside a microwave oven. Nitric acid was flushed into the reactor, which was then sealed and the contents were heated by an appropriate microwave programme so that the pressure was held at 400 Ib in-* for 5 min. During this period the presssure was continuously monitored. After cooling, the reactor was vented and the contents were flushed out into a calibrated flask and …
Permeation Tubes For Calibration In Flow Injection Analysis, Stuart J. Chalk, Julian Tyson, Don C. Olson
Permeation Tubes For Calibration In Flow Injection Analysis, Stuart J. Chalk, Julian Tyson, Don C. Olson
Chemistry Department Faculty Publication Series
No abstract provided.
Closed-Loop Recirculating Manifold For Matrix Isolation In Flow Injection Flame Atomic Absorption Spectrometry. Analysis Of Silver Electrolysis Solutions, Ebenezer Debrah, Julian Tyson, Mw Hinds
Closed-Loop Recirculating Manifold For Matrix Isolation In Flow Injection Flame Atomic Absorption Spectrometry. Analysis Of Silver Electrolysis Solutions, Ebenezer Debrah, Julian Tyson, Mw Hinds
Chemistry Department Faculty Publication Series
Two flow injection procedures have been investigated for the determination of some elements in silver electrolysis solutions, for which the problem of the formation of silver acetylide needs to be addressed. A single line manifold was found to give acceptable results for limited time periods, but for prolonged operation it was necessary to remove the silver. This was achieved with a recirculating reactor in which the silver was precipitated as the chloride and retained on a filter of nylon fibers. Good recoveries of copper, iron, nickel and zinc from solutions containing up to 100 g/l. silver were obtained with over …
Flow Injection Spectrochemical Analysis At The Winter Conference, Julian Tyson
Flow Injection Spectrochemical Analysis At The Winter Conference, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Continuous Flow Dilution For Flame Atomic Absorption Spectrometry Using A Variable Volume Dilution Chamber And Peak Area Measurement, Ernest Beinrohr, Pavol Csemi, Julian Tyson
Continuous Flow Dilution For Flame Atomic Absorption Spectrometry Using A Variable Volume Dilution Chamber And Peak Area Measurement, Ernest Beinrohr, Pavol Csemi, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Elimination Of Double Peaks In The Iodimetric Flow Injection Visible Spectrophotometric Determination Of Sulphite Using A Single-Channel Manifold, Julian Tyson, A. G. Fogg, X. Wang
Elimination Of Double Peaks In The Iodimetric Flow Injection Visible Spectrophotometric Determination Of Sulphite Using A Single-Channel Manifold, Julian Tyson, A. G. Fogg, X. Wang
Chemistry Department Faculty Publication Series
A flow injection method of determining sulphite with amperometric monitoring of iodine using a single-channel manifold in which iodine is formed in the reverse flow injection (rFI) manner and reacts with sulphite dispersing in the normal flow injection (nFI) manner has been adapted for use with visible spectrophotometry. The carrier stream consists of an alkaline solution containing iodate and an excess of iodide: injections of acid and then of acidified sulphite are made. The decrease in the iodine signal (measured at 352 nm) in the presence of sulphite is proportional to the sulphite concentration in the injectate. The alkalinity of …
Shapes Of Flow Injection Signals: Effect Of Refractive Index On Spectrophotometric Signals Obtained For On-Line Formation Of Bromine From Bromate, Bromide, And Hydrogen Ion In A Single-Channel Manifold Using Large-Volume Time-Based Injections, Julian Tyson, A. G. Fogg, E. Cipko, L. Farabella
Shapes Of Flow Injection Signals: Effect Of Refractive Index On Spectrophotometric Signals Obtained For On-Line Formation Of Bromine From Bromate, Bromide, And Hydrogen Ion In A Single-Channel Manifold Using Large-Volume Time-Based Injections, Julian Tyson, A. G. Fogg, E. Cipko, L. Farabella
Chemistry Department Faculty Publication Series
The shapes of the spectrophotometric signals obtained with a single-channel manifold for large-volume (4 ml) time-based injections for the six possible combinations of the reagents bromate, bromide and nitric acid in the injectate and carrier stream, by which bromine can be formed on-line, have been determined. The injectate and carrier stream were 5.25 x 10-4 M in bromate, 0.030 M in bromide and 1 M in nitric acid when these reagents were present. The signals consisted of two separate peaks caused by formation of bromine at the front and rear boundaries of the injected bolus. When both injectate and carrier …
Applications Of The Single Well Stirred Tank Model For Dispersion In Flow Injection, Julian Tyson
Applications Of The Single Well Stirred Tank Model For Dispersion In Flow Injection, Julian Tyson
Chemistry Department Faculty Publication Series
The single well stirred tank model in which dispersion is modelled by the passage of a slug of fluid through the tank has been used to compare the sensitivity that can be obtained by the use of three types of flow injection manifold, which incorporate on-line chemical reaction. These manifolds are the single-line manifold, the double-line manifold and the single-line manifold used in the reverse mode (i.e., the reagent is injected into the sample which constitutes the carrier stream). The model indicates that each manifold type will give the same sensitivity, but that operating conditions and throughput will be different …
Flow Injection Manifolds With Membrane Filters For Pre-Concentration And Interference Removal By Precipitation Flow Injection Flame Atomic Absorption Spectrometry, Ebenezer Debrah, C. E. Adeeyinwo, S. R. Bysouth, Julian Tyson
Flow Injection Manifolds With Membrane Filters For Pre-Concentration And Interference Removal By Precipitation Flow Injection Flame Atomic Absorption Spectrometry, Ebenezer Debrah, C. E. Adeeyinwo, S. R. Bysouth, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Use Of Masking Agents In The Determination Of Lead In Tap Water By Flame Atomic Absorption Spectrometry With Flow Injection Pre-Concentration, S. R. Bysouth, Julian Tyson, Peter B. Stockwell
Use Of Masking Agents In The Determination Of Lead In Tap Water By Flame Atomic Absorption Spectrometry With Flow Injection Pre-Concentration, S. R. Bysouth, Julian Tyson, Peter B. Stockwell
Chemistry Department Faculty Publication Series
No abstract provided.
Design And Operation Of An Autosampler Controlled Flow-Injection Preconcentration System For Lead Determination By Flame Atomic Absorption Spectrometry, Julian Tyson, S. R. Bysouth, P. B. Stockwell
Design And Operation Of An Autosampler Controlled Flow-Injection Preconcentration System For Lead Determination By Flame Atomic Absorption Spectrometry, Julian Tyson, S. R. Bysouth, P. B. Stockwell
Chemistry Department Faculty Publication Series
No abstract provided.