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Full-Text Articles in Physical Sciences and Mathematics
Integrating Arsenic-Related Environmental Topics Into The Education Of The Next Generation Of Citizens For Arsenic-Hit Communities: Awareness And Mobilization, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Keeping Track Of Our Arsenic Intake: A Possible Citizen-Science Project, Julian Tyson
Keeping Track Of Our Arsenic Intake: A Possible Citizen-Science Project, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Improving The Accuracy And Precision Of An Arsenic Field Test Kit: Increased Reaction Time And Digital Image Analysis, James Kearns, Julian Tyson
Improving The Accuracy And Precision Of An Arsenic Field Test Kit: Increased Reaction Time And Digital Image Analysis, James Kearns, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Study Of The Interactions Between Elodea Canadensis And Cuo Nanoparticles, M. E. Johnson, S. A. Ostroumov, Julian Tyson, B. Xing
Study Of The Interactions Between Elodea Canadensis And Cuo Nanoparticles, M. E. Johnson, S. A. Ostroumov, Julian Tyson, B. Xing
Chemistry Department Faculty Publication Series
No abstract provided.
The Arsenic Project: Creating Authentic Research Experiences For First-Year Undergraduates, Julian Tyson
The Arsenic Project: Creating Authentic Research Experiences For First-Year Undergraduates, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Chemistry For A Sustainable Future, Julian Tyson
Chemistry For A Sustainable Future, 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 …
Comparison Of The Maximum Sensitivity Of Different Flow Injection Manifold Configurations: Alternating Variable Search Optimization Of The Iron(Ii)/1,10-Phenanthroline System, Sj Chalk, Julian Tyson
Comparison Of The Maximum Sensitivity Of Different Flow Injection Manifold Configurations: Alternating Variable Search Optimization Of The Iron(Ii)/1,10-Phenanthroline System, Sj Chalk, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Flow Injection Analysis Concepts And Misconceptions, Julian Tyson
Flow Injection Analysis Concepts And Misconceptions, Julian Tyson
Chemistry Department Faculty Publication Series
Aspects of definitions of analytical chemistry and flow injection analysis are discussed. The driving force in analytical research of cost-effectiveness is identified and the characteristics of flow injection examined. Basic concepts of fluid flow relevant to flow injection are explained and some common misconceptions concerning the magnitude of various phenomena examined. The implications fa the design of manifolds for high sensitivity are evaluated and some practical problems addressed. Novel features of FI, which take advantages of the kinetic nature of suitable processes, are identified and illustrated by some of Professor Ishibshi's work.
Determination Of Total Mercury In Waters And Urine By Flow Injection Atomic Absorption Spectrometry Procedures Involving On- And Off-Line Oxidation Of Organomercury Species, Julian Tyson, C P. Hanna, S Mcintosh
Determination Of Total Mercury In Waters And Urine By Flow Injection Atomic Absorption Spectrometry Procedures Involving On- And Off-Line Oxidation Of Organomercury Species, Julian Tyson, C P. Hanna, S Mcintosh
Chemistry Department Faculty Publication Series
No abstract provided.
An Experiment Using Time-Based Detection In Flow Injection Analysis, Mary K. Carroll, Julian Tyson
An Experiment Using Time-Based Detection In Flow Injection Analysis, Mary K. Carroll, Julian Tyson
Chemistry Department Faculty Publication Series
We present a laboratory experiment, suitable for implementation in analytical chemistry courses at the undergraduate level, that demonstrates the utility of time-based measurements with doublet peaks in flow injection analysis. The measurements are taken with an instrument that incorporates a simple solid-state detector, which has as its source a light-emitting diode (LED) and as its detecting element a photodiode (PD). The system studied here is a simple acid-base titration. The experiment could be adapted to any number of chemical reactions that result in a product that absorbs light of the LED wavelength significantly.
Determination Of Arsenic In A Nickel Alloy By Flow Injection Hydride Generation Atomic Absorption Spectrometry, Julian Tyson, C P. Hanna, S G. Offley
Determination Of Arsenic In A Nickel Alloy By Flow Injection Hydride Generation Atomic Absorption Spectrometry, Julian Tyson, C P. Hanna, S G. Offley
Chemistry Department Faculty Publication Series
The development of a method for the direct determination of trace arsenic quantities in nickel alloy digests, by flow injection hydride generation atomic absorption spectrometry, is described. An optimization study of the manifold and chemical parameters produced system performance, in terms of tolerance of the nickel matrix and sensitivity, such that matrix removal and pre-reduction of As(V) to As (111) prior to arsine generation were eliminated. Full recovery of the As(V) signal from a solution containing 5 ng m1- 1 in the presence of 60 µg mJ- 1 nickel was obtained. Validation of the method was achieved by analyzing a …
Putting The Chemistry Back Into Analytical Chemistry, Julian Tyson
Putting The Chemistry Back Into Analytical Chemistry, Julian Tyson
Chemistry Department Faculty Publication Series
Aspects of the current status of and research in analytical chemistry are briefly discussed and the need for cost effective analytical procedures is emphasized. The present and future of a number of aspects of flow-injection analysis are considered. These include the basic theory, the kinetic features, the control features, time-based methodology, and the coupling of sample pretreatment with instrumentation. Several aspects of this latter topic are considered with particular reference to the flow-injection atomic spectrometry combination. Problems of kinetic mismatch between chemistry, manifold residence, and instrument operation are discussed and some possible solutions proposed including the use of closed loop …
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.
Is This Paper Within The Scope Of The Journal?, Julian Tyson
Is This Paper Within The Scope Of The Journal?, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Investigation Into Low Cost Flow Injection Analysis, Julian Tyson
Investigation Into Low Cost Flow Injection Analysis, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Modern Analytical Chemistry, Julian Tyson
Modern Analytical Chemistry, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
A Judicious Mixture Of Reaction Chemistry And Instrumentation, Julian Tyson
A Judicious Mixture Of Reaction Chemistry And Instrumentation, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Atomic Spectrometry And Flow Injection Analysis: A Synergic Combination, Julian Tyson
Atomic Spectrometry And Flow Injection Analysis: A Synergic Combination, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Atomiser, Source, Inductively Coupled Plasmas In Atomic Fluoresence Spectrometry (Asia): A Study Of Chemical And Ionisation Interference Effects, Stanley Greenfield, M. S. Salman, Julian Tyson
Atomiser, Source, Inductively Coupled Plasmas In Atomic Fluoresence Spectrometry (Asia): A Study Of Chemical And Ionisation Interference Effects, Stanley Greenfield, M. S. Salman, Julian Tyson
Chemistry Department Faculty Publication Series
The effects of phosphate, aluminium, sodium and potassium on the atomic fluorescence of calcium at 422.7 nm and the ionic fluorescence at I:393.4-396.8 nm have been studied. When the operating conditions are optimised for maximum fluorescence signal from a solution containing no interferents, interference effects are observed which may be interpreted in terms of stable compound formation, ionisation suppression and fluorescence quenching. These effects may be removed by optimising the operating parameters for minimum interference.
Flow Injection Calibration Techniques, Julian Tyson
Flow Injection Calibration Techniques, Julian Tyson
Chemistry Department Faculty Publication Series
The role of calibration in the overall analytical procedure is discussed and the potential role of flow injection techniques are assessed. The factors affecting the dispersion obtained in a flow injection system are described and examples given of how control of the various factors can be exploited to produce manifolds for calibration purposes. Most of these examples concern atomic spectrometry methods for which there is considerable interest at present in developing extended range calibrations and flow injection versions of the standard additions method. Several examples of the latter are given.
A Simple Lecture Demonstration Of Flow Injection Analysis, Julian Tyson
A Simple Lecture Demonstration Of Flow Injection Analysis, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Classical Analysis In The University, Julian Tyson
Classical Analysis In The University, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Current Calibration Practices For Flame Atomic Absorption Spectrometry - 1. Initial Results From A Survey, S. R. Bysouth, Julian Tyson
Current Calibration Practices For Flame Atomic Absorption Spectrometry - 1. Initial Results From A Survey, S. R. Bysouth, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
The Principles Of Flow Injection Titration, Julian Tyson
The Principles Of Flow Injection Titration, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Analytical Applications Of Absorption Spectroelectrochemistry At Grazing Incidence, Julian Tyson
Analytical Applications Of Absorption Spectroelectrochemistry At Grazing Incidence, Julian Tyson
Chemistry Department Faculty Publication Series
Analytical applications of spectroelectrochemistry are limited by the short path-length, in the absorbing medium, that can be produced with most light-beam/electrode configurations. This disadvantage is overcome for grazing incidence. A cell fitted with glassy-carbon electrodes and used in a conventional spectrophotometer is described and applied to model systems illustrating the use of (a) homogeneous redox reactions, (b) homogeneous redox reaction followed by chemical reaction and (c) electro-deposition followed by stripping into a reagent solution. This last technique is the spectroelectrochemical analogue of anodic-stripping voltammetry.
Peak Width And Reagent Dispersion In Flow Injection Analysis, Julian Tyson
Peak Width And Reagent Dispersion In Flow Injection Analysis, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
Atomic Spectroscopy- The Short Course Organiser's Approach, Julian Tyson
Atomic Spectroscopy- The Short Course Organiser's Approach, Julian Tyson
Chemistry Department Faculty Publication Series
No abstract provided.
A Continuous Dilution Calibration Technique For Flame Atomic-Absorption Spectrophotometry, Julian Tyson, J. M.H. Appleton
A Continuous Dilution Calibration Technique For Flame Atomic-Absorption Spectrophotometry, Julian Tyson, J. M.H. Appleton
Chemistry Department Faculty Publication Series
Calibration in atomic-absorption spectrometry is achieved by means of a concentration-gradient chamber using a single concentrated standard solution. Calibration is rapid and extends over the entire working concentration range of the analyte, irrespective of the shape of the conventionally obtained calibration curve. No curve-fitting approximations are involved. With well-designed apparatus, deviations are less than 1%.