Comparison of Aerosol Sample Introduction Systems for a DCP

1990 ◽  
Vol 44 (1) ◽  
pp. 96-100 ◽  
Author(s):  
Gary D. Rayson ◽  
Vanessa M. Chrisman
Keyword(s):  
Dynamic Range ◽  
Cross Flow ◽  
Sample Introduction ◽  
Aerosol Sample ◽  
Spray Chamber ◽  
Linear Dynamic Range ◽  
Double Pass ◽  
Direct Current Plasma ◽  
Phosphate Salts ◽  
Nebulizer Spray

The results of a comparative study of the relative analytical performance of different nebulizer and spray-chamber designs with a direct-current plasma (DCP) are described. Concentric-glass, cross-flow, and Babington-type nebulizers were each evaluated with either a double-pass or an open spray-chamber geometry for the effect of each combination on the observed linear dynamic range and the magnitude of interferences arising from the presence of an easily ionizable element (sodium) and difficult-to-vaporize species (phosphate salts). The performance of each of these combinations was compared to that of the nebulizer/spray-chamber configuration provided by the manufacturer. For nearly all cases, the manufacturer's configuration provided, at worst, comparable signal intensities for all conditions investigated.

scholarly journals Diagnostics of Plasma Pencil Discharge for Chemical Analysis

2019 ◽  
Vol 6 (1) ◽  
pp. 95-98
Author(s):  
P. Slavíček ◽  
A. Hrdlicka ◽  
M. Dvorakova ◽  
V. Kanicky
Keyword(s):  
Atmospheric Pressure ◽  
Optical Emission Spectroscopy ◽  
Optical Emission ◽  
Sample Introduction ◽  
Rf Plasma ◽  
Aerosol Sample ◽  
Spray Chamber ◽  
Double Pass ◽  
Plasma Pencil ◽  
Nozzle Flows

We present diagnostics of plasma pencil discharge as alternative excitation source for analytical chemistry. The plasma pencil is special type of rf plasma nozzle at atmospheric pressure. Through this nozzle flows working gas argon with aerosol. The aerosol sample introduction system employed a double pass Scott spray chamber with a pneumatic concentric nebulizer. The parameters of the plasma were calculated by optical emission spectroscopy.<br /><br />

An HF-Resistant Sample Introduction System for the Inductively Coupled Plasma

1983 ◽  
Vol 37 (1) ◽  
pp. 17-19 ◽  
Author(s):  
Ramon M. Barnes ◽  
Himansu S. Mahanti
Keyword(s):  
Memory Effect ◽  
Inductively Coupled Plasma ◽  
System Analysis ◽  
Cross Flow ◽  
Sample Introduction ◽  
Spray Chamber ◽  
Conventional System ◽  
Inductively Coupled ◽  
Sample Introduction System

A sample introduction system constructed of materials completely resistant to HF was developed for analysis of HF-containing samples. A machined graphite injector tube, polytetrafluoroethylene (PTFE) spray chamber, and cross flow nebulizer containing PTFE capillaries were employed. The arrangement is completely compatible with commercial ICP systems and can be interchanged readily. The nebulizer efficiency and memory effect were studied and compared with a conventional system. Analysis of silicon in commercial HF acid was performed.

Single Particle Inductively Coupled Plasma Mass Spectrometry: Investigating Nonlinear Response Observed in Pulse Counting Mode and Extending the Linear Dynamic Range by Compensating for Dead Time Related Count Losses on a Microsecond Timescale

2019 ◽  
Author(s):  
Ingo Strenge ◽  
Carsten Engelhard
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Nonlinear Response ◽  
Dynamic Range ◽  
Dead Time ◽  
Inorganic Nanoparticles ◽  
Linear Dynamic Range ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

<p>The article demonstrates the importance of using a suitable approach to compensate for dead time relate count losses (a certain measurement artefact) whenever short, but potentially strong transient signals are to be analysed using inductively coupled plasma mass spectrometry (ICP-MS). Findings strongly support the theory that inadequate time resolution, and therefore insufficient compensation for these count losses, is one of the main reasons for size underestimation observed when analysing inorganic nanoparticles using ICP-MS, a topic still controversially discussed.</p>

Characterization of an Improved dc Plasma Excitation Source

1980 ◽  
Vol 34 (1) ◽  
pp. 24-30 ◽  
Author(s):  
G. N. Coleman ◽  
W. P. Braun ◽  
A. M. Allen
Keyword(s):  
Thermal Conductivity ◽  
Direct Current ◽  
Direct Evidence ◽  
Plasma Jet ◽  
Sample Introduction ◽  
Direct Current Plasma ◽  
Actual Mechanism ◽  
Improved Stability ◽  
Plasma Excitation

Several modifications of the direct current plasma jet have resulted in significantly enhanced analysis capabilities. Reducing the electrode angle, decreasing the aerosol chimney size, and operating in a diffuse mode with helium have provided improved stability, sensitivity, freedom from interferences, and detection limits. While the actual mechanism of the helium enhancement is not clear, no direct evidence was found which supports participation in the excitation step. Rather, improved desolvation, vaporization and possibly sample introduction result from the thermal conductivity of helium being much greater than that of argon.

Convenient Fiber-Optic-Based Sample Cell for Shpol'skii and Low-Temperature Phosphorescence Spectrometry

1989 ◽  
Vol 43 (3) ◽  
pp. 422-425 ◽  
Author(s):  
Richard T. Madison ◽  
Mary K. Carroll ◽  
Gary M. Hieftje
Keyword(s):  
Low Temperature ◽  
Fiber Optic ◽  
Dynamic Range ◽  
Detection Limits ◽  
Linear Dynamic Range ◽  
Sample Cell ◽  
Linear Dynamic ◽  
Light Guides

A sample cell for observing the Shpol'skii effect at 77 K is described and analytically assessed. The cell employs fiber-optic light guides to transport excitation and emission radiation. The system is compact, inexpensive, and simple to construct from commercially available laboratory components, and it alleviates several problems inherent in conventional refrigerated-cell designs. Detection limits for anthracene, coronene, and pyrene obtained with the sample cell are 8.8 × 10−8 M, 8.4 × 10−7 M, and 3.5 × 10−7 M, respectively. The linear dynamic range for each compound is 2 to 3 orders of magnitude.

Sign in / Sign up

Export Citation Format

Share Document