@article {5137, title = {Analyte ionization in the furnace atomization plasma excitation spectrometry source - spatial and temporal observations}, journal = {Journal of Analytical Atomic Spectrometry}, volume = {16}, number = {3}, year = {2001}, note = {ISI Document Delivery No.: 405MHTimes Cited: 7Cited Reference Count: 34}, pages = {256-262}, type = {Article}, abstract = {Spatially resolved atomic and ionic emission has been measured in a FAPES source at radiofrequency (rf) powers ranging between 10 and 100w. The degree of ionization was spatially dependent, with maxima adjacent to the centre electrode and graphite cuvette wall. Temporally resolved atomic and ionic emission have also been measured in a newly designed FAPES source, and the temporal ionization behaviour of Mg, Cd, Fe, Zn and Cr was derived from these measurements.}, keywords = {EMISSION-SPECTROMETRY, FAPES, FIGURES, GRAPHITE-FURNACE, LEAD, MERIT, silver, SPECTROSCOPY}, isbn = {0267-9477}, url = {://000167163200003}, author = {Lu, S. Y. and LeBlanc, C. W. and Blades, M. W.} } @article {4026, title = {Simplex optimisation of conditions for the determination of antimony in environmental samples by using electrothermal atomic absorption spectrometry}, journal = {Talanta}, volume = {44}, number = {7}, year = {1997}, note = {ISI Document Delivery No.: XE053Times Cited: 14Cited Reference Count: 24}, month = {Jul}, pages = {1241-1251}, type = {Article}, abstract = {Analysis of the total antimony in plant material was unsuccessful using the electrothermal atomic absorption spectrometry (ETAAS) conditions recommended by the instrument manufacturer. For this reason, an optimisation procedure utilising the Plackett-Burman method, simplex optimisation and visualisation of the generated response surface via principal components analysis, was carried out. The Plackett-Burman method was used to eliminate four of the initial variables chosen. Four variables (atomisation temperature, atomisation time, ash temperature and modifier concentration) were subsequently optimised using the composite modified simplex method and the results were visualised as a contour diagram, after reduction to two principal components. The optimised conditions were used for the analysis of both an acid digested pine needle standard reference material (NIST 1575) and a pond weed sample, collected from a contaminated site at Yellowknife Bay, Yellowknife, NWT, Canada. The total concentration of antimony present in the pine needles was statistically indistinguishable from the non-certified value, as was the value for the pond weed sample, compared with a value determined by neutron activation analysis (NAA). The results for the analysis of the pond weed sample by ETAAS agreed with those obtained from a subsequent analysis by inductively coupled plasma-mass spectrometry. (C) 1997 Elsevier Science B.V.}, keywords = {ANTIMONY, electrothermal atomic absorption spectroscopy, environmental, GRAPHITE-FURNACE, HYDRIDE GENERATION, INTERFERENCES, OPTIMIZATION, PLASMA-MASS-SPECTROMETRY, REFLECTIONS, SAMPLES, simplex optimisation and Plackett-Burman design}, isbn = {0039-9140}, url = {://A1997XE05300013}, author = {Koch, I. and Harrington, C. F. and Reimer, K. J. and Cullen, W. R.} } @article {4047, title = {Spatial and temporal profiles of indium in a furnace atomization plasma excitation spectrometry source}, journal = {Applied Spectroscopy}, volume = {51}, number = {11}, year = {1997}, note = {ISI Document Delivery No.: YP332Times Cited: 5Cited Reference Count: 39}, month = {Nov}, pages = {1715-1721}, type = {Article}, abstract = {Spatially resolved emission and absorption intensities from the indium 303.93-nm resonance line were measured in a furnace atomization plasma excitation spectrometry (FAPES) source. These measurements show that the spatial structure observed in the analyte emission is due to two effects, The first is the spatial distribution of analyte atoms in the source. The absorption measurements show that this spatial distribution is fairly uniform. There is a slight gradient, with analyte concentrations increasing from the cuvette wall to the center electrode. The fine structure in the emission intensity profiles must therefore be caused by the dependence of the degree of analyte excitation on position within the cuvette. This structure suggests that the FAPES source operates as an atmospheric-pressure radio-frequency glow discharge. Negative glows are seen adjacent to the graphite cuvette wall and center electrode.}, keywords = {ABSORPTION, aluminum, ANALYTE, ATOMIC-ABSORPTION, CCD, DYNAMICS, emission, EMISSION-SPECTROMETRY, FAPES, FURNACE ATOMIZATION PLASMA EXCITATION SPECTROMETRY, GRAPHITE-FURNACE, indium, INVESTIGATING ELECTROTHERMAL ATOMIZATION, LEAD, profile, SPATIAL, SPECTROSCOPY}, isbn = {0003-7028}, url = {://000071266300022}, author = {LeBlanc, C. W. and Blades, M. W.} } @article {3140, title = {SIMPLEX OPTIMIZATION OF CONDITIONS FOR THE DETERMINATION OF ARSENIC IN ENVIRONMENTAL-SAMPLES BY USING ELECTROTHERMAL ATOMIC-ABSORPTION SPECTROMETRY}, journal = {Talanta}, volume = {41}, number = {2}, year = {1994}, note = {ISI Document Delivery No.: NJ812Times Cited: 18Cited Reference Count: 25}, month = {Feb}, pages = {205-209}, type = {Article}, abstract = {Simplex optimization was used to efficiently delineate the optimum experimental conditions to be used for the electrothermal atomic absorption spectrometric analysis of arsenic in a standard reference material of marine origin. Four experimental variables, were considered: ashing temperature, atomization temperature, modifier concentration, and atomization ramping time. This combination of methods and materials provides a powerful means of rapidly improving the experimental conditions used for analysis of arsenic in a wide variety of samples of environmental origin. Excellent recoveries of arsenic were obtained when using the optimum electrothermal atomic absorption spectrometry conditions to analyze standard solutions of arsenobetaine, arsenocholine and tetramethylarsonium iodide.}, keywords = {GRAPHITE-FURNACE, REFLECTIONS}, isbn = {0039-9140}, url = {://A1994NJ81200007}, author = {Pergantis, S. A. and Cullen, W. R. and Wade, A. P.} } @article {2823, title = {FURNACE ATOMIZATION PLASMA EXCITATION SPECTROMETRY - EFFECTS OF SODIUM-CHLORIDE AND SODIUM-NITRATE ON LEAD AND SILVER EMISSION}, journal = {Journal of Analytical Atomic Spectrometry}, volume = {8}, number = {7}, year = {1993}, note = {ISI Document Delivery No.: ME197Times Cited: 9Cited Reference Count: 22}, month = {Oct}, pages = {955-959}, type = {Article}, abstract = {The effect of alkali halide and nitrate salts on the emission intensity from Ag and Pb, excited using furnace atomization plasma excitation spectrometry, has been studied. Compared with the emission signal obtained when there is no interferent, the presence of either NaNO3 or NaCl as a comcomitant in the sample causes an interference effect by decreasing the emission intensity over the power range 14-40 W.}, keywords = {ATOMIC-ABSORPTION SPECTROMETRY, EASILY IONIZED ELEMENT, FAPES, FURNACE ATOMIZATION PLASMA EXCITATION SPECTROMETRY, GRAPHITE FURNACE, GRAPHITE-FURNACE, HELIUM PLASMA, INTERFERENCE, INTERFERENCES, PLATFORM, SPECTROSCOPY}, isbn = {0267-9477}, url = {://A1993ME19700005}, author = {Hettipathirana, T. D. and Blades, M. W.} } @article {7259, title = {TEMPORAL EMISSION AND ABSORPTION CHARACTERISTICS OF SILVER, LEAD AND MANGANESE IN FURNACE ATOMIZATION PLASMA EXCITATION SPECTROMETRY}, journal = {Journal of Analytical Atomic Spectrometry}, volume = {7}, number = {7}, year = {1992}, note = {ISI Document Delivery No.: JY532Times Cited: 15Cited Reference Count: 37}, month = {Oct}, pages = {1039-1046}, type = {Article}, abstract = {The temporal behaviour of the signal measured for Ag, Pb and Mn in furnace atomization plasma excitation spectrometry was studied using atomic emission and atomic absorption spectrometry. Analyte was deposited both on the wall and on the r.f. electrode with and without the r.f. power applied. Analyte condensation on the r.f. electrode is observed when no plasma is formed. When the plasma is formed inside the furnace it heats the electrode such that, for Ag and Pb, condensation is not observed except for large amounts of analyte. For Ag and Mn, the appearance temperatures and peak temperatures are not significantly affected by the plasma relative to the response obtained using a graphite furnace. For Pb, appearance and peak temperatures are shifted significantly earlier. For Pb, atom formation may be effected by the presence of CO in the gas phase generated from oxidation of the graphite furnace wall and electrode. The role of carbon in atom formation was studied by depositing the sample on both tungsten and graphite electrodes.}, keywords = {ASCORBIC-ACID, ATOMIC-ABSORPTION, DOUBLE PEAKS, ELECTROTHERMAL ATOMIZATION, FAPES, FURNACE ATOMIZATION PLASMA EXCITATION SPECTROMETRY, GRAPHITE FURNACE, GRAPHITE-FURNACE, LEAD AND MANGANESE SIGNALS, MECHANISMS, silver, SURFACE, TEMPERATURE, vaporization}, isbn = {0267-9477}, url = {://A1992JY53200002}, author = {Hettipathirana, T. D. and Blades, M. W.} }