Nancy Miller-Ihli - Academia.edu (original) (raw)

Uploads

Papers by Nancy Miller-Ihli

Research paper thumbnail of Trace element determinations in food and biological samples using ICP-MS

Research paper thumbnail of A direct comparison of electrothermal atomic absorption and emission spectrometry for the analysis of chromium in urine

Research paper thumbnail of Staircase modulation wave form for continuum source atomic absorption spectrometry

Analytical Chemistry, 1984

ABSTRACT A new staircase modulation wave form is implemented for extended range continuum source ... more ABSTRACT A new staircase modulation wave form is implemented for extended range continuum source AAS (atomic absorption spectrometry) measurements, which improves performance and simplifies the computation of concentrations. This wave form facilitates the computation of two absorbances of different sensitivity for every atomization. The resulting two calibration curves allow 4-6 orders of magnitude of concentration to be covered effectively. Calibration curves and concentration error curves are compared for Mn, Zn, Fe, Cu, and Mg with the old bi-Gaussian and the new staircase modulation wave forms. Linearities, sensitivities, and SNR's (signal-to-noise ratios) of the curves obtained by using the two modulation wave forms are compared. In addition, accuracy using the staircase modulation wave form was evaluated by running National Bureau of Standards (NBS) standard reference materials (SRM's). 6 references, 13 figures, 1 table.

Research paper thumbnail of Simultaneous multi-element analysis by carbon furnace atomic-emission spectrometry

Research paper thumbnail of Potential sources of error in capillary electrophoresis–inductively coupled plasma mass spectrometry for chemical speciation†

Research paper thumbnail of Two simple interface designs for capillary electrophoresis–inductively coupled plasma mass spectrometry†

The Analyst, 1998

The design and implementation of two different interfaces for capillary electrophoresis–inductive... more The design and implementation of two different interfaces for capillary electrophoresis–inductively coupled plasma mass spectrometry (CE–ICP-MS) are described. These interfaces will allow for on-line analysis of CE effluents with ICP-MS detection. One interface is based on a ...

Research paper thumbnail of Simultaneous multi-element analysis by continuum source atomic-absorption spectrometry with graphite probe electrothermal atomisation

Research paper thumbnail of Use of a parallel path nebulizer for capillary-based microseparation techniques coupled with an inductively coupled plasma mass spectrometer for speciation measurements

Spectrochimica Acta Part B: Atomic Spectroscopy, 2004

Research paper thumbnail of Parallel path nebulizer: Critical parameters for use with microseparation techniques combined with inductively coupled plasma mass spectrometry

Spectrochimica Acta Part B: Atomic Spectroscopy, 2005

Research paper thumbnail of Calibration and curve fitting for extended range AAS

Spectrochimica Acta Part B: Atomic Spectroscopy, 1984

Research paper thumbnail of Walter Slavin: scientist, mentor and friend

Spectrochimica Acta Part B: Atomic Spectroscopy, 2001

Research paper thumbnail of Slurry sampling graphite furnace atomic absorption spectrometry: a preliminary examination of results from an international collaborative study

Spectrochimica Acta Part B: Atomic Spectroscopy, 1995

Research paper thumbnail of The copper content of foods based on a critical evaluation of published analytical data

Journal of Food Composition and Analysis, 1989

Research paper thumbnail of Trace Element Composition of Municipal Waters in the United States: A Comparison of ICP-AES and ICP-MS Methods

Journal of Food Composition and Analysis, 2001

... Anal. 13 (2000), pp. 379–389. Abstract | PDF (161 K) | View Record in Scopus | Cited By in Sc... more ... Anal. 13 (2000), pp. 379–389. Abstract | PDF (161 K) | View Record in Scopus | Cited By in Scopus (58). 9. MA Saleh, E. Ewane, J. Jones and BL Wilson, Chemical evaluation of commercial bottled drinking water from Egypt. J. Food Comp. Anal. 14 (2001), pp. 127–152. ...

Research paper thumbnail of Fluoride content of municipal water in the United States: what percentage is fluoridated?

Journal of Food Composition and Analysis, 2003

Research paper thumbnail of Conference reports

Journal of Analytical Atomic Spectrometry, 1989

Research paper thumbnail of Comparison of sodium chloride and magnesium chloride interferences in continuum source atomic absorption spectrometry with wall, platform and probe electrothermal atomization

Journal of Analytical Atomic Spectrometry, 1992

ABSTRACT Various masses between 10 and 500 µg of NaCl or MgCl2 were added to 1 ng of Cr, Cu and M... more ABSTRACT Various masses between 10 and 500 µg of NaCl or MgCl2 were added to 1 ng of Cr, Cu and Mn, 2 ng of Cd and Pb and 4 ng of Co, Mo, Ni and V to study the interferences encountered when wall, platform and probe atomization are applied in continuum source electrothermal atomic absorption spectrometry. No char step was used and a compromise atomization temperature of 2700 °C was selected for simultaneous multi-element measurements. No great difference was observed in the analyte signal recovery values obtained with the three atomization modes when NaCl was the interferent. However, with MgCl2, greater interferences were observed with wall atomization. Overall, probe atomization proved as good as, if not better than platform atomization for the elements considered. With both procedures, freedom from NaCl or MgCl2 interferences was achieved at chloride salt: analyte mole ratios of 1 × 103–1 × 105. Although it was not possible to make a definitive assessment of the procedures responsible for the interferences observed, there was some evidence that vapour-phase chemical effects are more important for MgCl2 than for NaCl, occlusion of Cd, Mn and Pb occurs in NaCl and expulsion of Co, Cr, Cu, Mn and Ni occurs due to co-vaporization with NaCl.

Research paper thumbnail of Direct analysis of solids by ultrasonic slurry electrothermal vaporization inductively coupled plasma mass spectrometry

J. Anal. At. Spectrom., 1994

Research paper thumbnail of Slurry sample preparation for simultaneous multi-element graphite furnace atomic absorption spectrometry

Journal of Analytical Atomic Spectrometry, 1988

ABSTRACT

Research paper thumbnail of Trace Element Determinations in Foods and Biological Samples Using Inductively Coupled Plasma Atomic Emission Spectrometry and Flame Atomic Absorption Spectrometry

Journal of Agricultural and Food Chemistry, 1996

Research paper thumbnail of Trace element determinations in food and biological samples using ICP-MS

Research paper thumbnail of A direct comparison of electrothermal atomic absorption and emission spectrometry for the analysis of chromium in urine

Research paper thumbnail of Staircase modulation wave form for continuum source atomic absorption spectrometry

Analytical Chemistry, 1984

ABSTRACT A new staircase modulation wave form is implemented for extended range continuum source ... more ABSTRACT A new staircase modulation wave form is implemented for extended range continuum source AAS (atomic absorption spectrometry) measurements, which improves performance and simplifies the computation of concentrations. This wave form facilitates the computation of two absorbances of different sensitivity for every atomization. The resulting two calibration curves allow 4-6 orders of magnitude of concentration to be covered effectively. Calibration curves and concentration error curves are compared for Mn, Zn, Fe, Cu, and Mg with the old bi-Gaussian and the new staircase modulation wave forms. Linearities, sensitivities, and SNR's (signal-to-noise ratios) of the curves obtained by using the two modulation wave forms are compared. In addition, accuracy using the staircase modulation wave form was evaluated by running National Bureau of Standards (NBS) standard reference materials (SRM's). 6 references, 13 figures, 1 table.

Research paper thumbnail of Simultaneous multi-element analysis by carbon furnace atomic-emission spectrometry

Research paper thumbnail of Potential sources of error in capillary electrophoresis–inductively coupled plasma mass spectrometry for chemical speciation†

Research paper thumbnail of Two simple interface designs for capillary electrophoresis–inductively coupled plasma mass spectrometry†

The Analyst, 1998

The design and implementation of two different interfaces for capillary electrophoresis–inductive... more The design and implementation of two different interfaces for capillary electrophoresis–inductively coupled plasma mass spectrometry (CE–ICP-MS) are described. These interfaces will allow for on-line analysis of CE effluents with ICP-MS detection. One interface is based on a ...

Research paper thumbnail of Simultaneous multi-element analysis by continuum source atomic-absorption spectrometry with graphite probe electrothermal atomisation

Research paper thumbnail of Use of a parallel path nebulizer for capillary-based microseparation techniques coupled with an inductively coupled plasma mass spectrometer for speciation measurements

Spectrochimica Acta Part B: Atomic Spectroscopy, 2004

Research paper thumbnail of Parallel path nebulizer: Critical parameters for use with microseparation techniques combined with inductively coupled plasma mass spectrometry

Spectrochimica Acta Part B: Atomic Spectroscopy, 2005

Research paper thumbnail of Calibration and curve fitting for extended range AAS

Spectrochimica Acta Part B: Atomic Spectroscopy, 1984

Research paper thumbnail of Walter Slavin: scientist, mentor and friend

Spectrochimica Acta Part B: Atomic Spectroscopy, 2001

Research paper thumbnail of Slurry sampling graphite furnace atomic absorption spectrometry: a preliminary examination of results from an international collaborative study

Spectrochimica Acta Part B: Atomic Spectroscopy, 1995

Research paper thumbnail of The copper content of foods based on a critical evaluation of published analytical data

Journal of Food Composition and Analysis, 1989

Research paper thumbnail of Trace Element Composition of Municipal Waters in the United States: A Comparison of ICP-AES and ICP-MS Methods

Journal of Food Composition and Analysis, 2001

... Anal. 13 (2000), pp. 379–389. Abstract | PDF (161 K) | View Record in Scopus | Cited By in Sc... more ... Anal. 13 (2000), pp. 379–389. Abstract | PDF (161 K) | View Record in Scopus | Cited By in Scopus (58). 9. MA Saleh, E. Ewane, J. Jones and BL Wilson, Chemical evaluation of commercial bottled drinking water from Egypt. J. Food Comp. Anal. 14 (2001), pp. 127–152. ...

Research paper thumbnail of Fluoride content of municipal water in the United States: what percentage is fluoridated?

Journal of Food Composition and Analysis, 2003

Research paper thumbnail of Conference reports

Journal of Analytical Atomic Spectrometry, 1989

Research paper thumbnail of Comparison of sodium chloride and magnesium chloride interferences in continuum source atomic absorption spectrometry with wall, platform and probe electrothermal atomization

Journal of Analytical Atomic Spectrometry, 1992

ABSTRACT Various masses between 10 and 500 µg of NaCl or MgCl2 were added to 1 ng of Cr, Cu and M... more ABSTRACT Various masses between 10 and 500 µg of NaCl or MgCl2 were added to 1 ng of Cr, Cu and Mn, 2 ng of Cd and Pb and 4 ng of Co, Mo, Ni and V to study the interferences encountered when wall, platform and probe atomization are applied in continuum source electrothermal atomic absorption spectrometry. No char step was used and a compromise atomization temperature of 2700 °C was selected for simultaneous multi-element measurements. No great difference was observed in the analyte signal recovery values obtained with the three atomization modes when NaCl was the interferent. However, with MgCl2, greater interferences were observed with wall atomization. Overall, probe atomization proved as good as, if not better than platform atomization for the elements considered. With both procedures, freedom from NaCl or MgCl2 interferences was achieved at chloride salt: analyte mole ratios of 1 × 103–1 × 105. Although it was not possible to make a definitive assessment of the procedures responsible for the interferences observed, there was some evidence that vapour-phase chemical effects are more important for MgCl2 than for NaCl, occlusion of Cd, Mn and Pb occurs in NaCl and expulsion of Co, Cr, Cu, Mn and Ni occurs due to co-vaporization with NaCl.

Research paper thumbnail of Direct analysis of solids by ultrasonic slurry electrothermal vaporization inductively coupled plasma mass spectrometry

J. Anal. At. Spectrom., 1994

Research paper thumbnail of Slurry sample preparation for simultaneous multi-element graphite furnace atomic absorption spectrometry

Journal of Analytical Atomic Spectrometry, 1988

ABSTRACT

Research paper thumbnail of Trace Element Determinations in Foods and Biological Samples Using Inductively Coupled Plasma Atomic Emission Spectrometry and Flame Atomic Absorption Spectrometry

Journal of Agricultural and Food Chemistry, 1996