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Articles 391 - 394 of 394
Full-Text Articles in Materials Science and Engineering
Metal Cation/Anion Speciation Via Paired-Ion, Reversed Phase Hplc With Refractive Index And/Or Inductively Coupled Plasma Emission Spectroscopic Detection Methods, Richard N. Savage, D. Bushee, I. S. Krull, S. B. Smith, Jr.
Metal Cation/Anion Speciation Via Paired-Ion, Reversed Phase Hplc With Refractive Index And/Or Inductively Coupled Plasma Emission Spectroscopic Detection Methods, Richard N. Savage, D. Bushee, I. S. Krull, S. B. Smith, Jr.
Materials Engineering
Conventional high performance liquid chromatography instrumentation and packing materials can be inexpensively and rapidly utilized for the qualitative and quantitative analysis of various metal cations or anions. The final approaches utilize reversed phase HPLC in the form of paired-ion separations. The detection of individually eluted, fully resolved metal cations or anions is possible via conventional refractive index or inductively coupled plasma emission spectroscopic detection. In many cases, unresolved mixtures of metal cations, eluted as a single peak on HPLC, can be resolved and identified via the use of ICP detection. Both metal cations and anions can be easily resolved, according …
Development And Characterization Of A 9-Mm Inductively-Coupled Argon Plasma Source For Atomic Emission Spectrometry, A. D. Weiss, Richard N. Savage, G. M. Hieftje
Development And Characterization Of A 9-Mm Inductively-Coupled Argon Plasma Source For Atomic Emission Spectrometry, A. D. Weiss, Richard N. Savage, G. M. Hieftje
Materials Engineering
A new 9-mm (i.d.) inductively-coupled plasma (ICP) torch is described which supports a stable, analytically useful plasma at less than 500 W of r.f. power and 7 l min-1 total argon gas flow. Detection limits, working curves and other analytical characteristics of the new device are compared with those of both a miniature (13-mm i.d.) and conventional (19-mm i.d.) ICP. Although temperatures of the new plasma are somewhat lower than those in the larger plasmas, the new system offers promise for future, miniaturized ICP instruments.
Characteristics Of The Background Emission Spectrum From A Miniature Inductively-Coupled Plasma, Richard N. Savage, G. M. Hieftje
Characteristics Of The Background Emission Spectrum From A Miniature Inductively-Coupled Plasma, Richard N. Savage, G. M. Hieftje
Materials Engineering
The spectral characteristics of the background radiation emitted by a miniature inductively-coupled plasma (i.c.p.) are carefully examined and methods for reducing undesirable features discussed. The complex nature of the background emission spectrum for the mini-i.c.p. indicates that careful line selection criteria and background correction procedures should be employed. Extending the torch coolant tube to the bottom of the region being observed in the plasma proved to be the most effective method for reducing undesirable spectral band features. Acute changes in background emission levels with r.f. power and nebulizer gas flow rates emphasize the need for careful control of these parameters …
Enhancement Of Pneumatic Nebulization Efficiency Through Application Of An Electric Field, Richard N. Savage, G. M. Hieftje
Enhancement Of Pneumatic Nebulization Efficiency Through Application Of An Electric Field, Richard N. Savage, G. M. Hieftje
Materials Engineering
A novel technique is described for reducing the size of aerosol droplets produced by a pneumatic nebulizer of the kind commonly used in flame or plasma spectrometry. The technique involves the application of an electric field to the tip of the nebulizer, resulting in an induced surface charge on the liquid being nebulized. In turn, the surface charge reduces the liquid's surface tension and results in the generation of a finer aerosol. In this study, the effect of the electric field is quantified in terms of the spatial dispersion and size distribution of aerosol droplets formed in the presence and …