Inductively coupled plasma spectrometry: Noise characteristics of aerosols, application of generalized standard additions method, and Mach disk as an emission source
- Iowa State Univ., Ames, IA (United States)
This dissertation is focused on three problem areas in the performance of inductively coupled plasma (ICP) source. The noise characteristics of aerosols produced by ICP nebulizers are investigated. A laser beam is scattered by aerosol and detected by a photomultiplier tube and the noise amplitude spectrum of the scattered radiation is measured by a spectrum analyzer. Discrete frequency noise in the aerosol generated by a Meinhard nebulizer or a direct injection nebulizer is primarily caused by pulsation in the liquid flow from the pump. A Scott-type spray chamber suppresses white noise, while a conical, straight-pass spray chamber enhances white noise, relative to the noise seen from the primary aerosol. Simultaneous correction for both spectral interferences and matrix effects in ICP atomic emission spectrometry (AES) can be accomplished by using the generalized standard additions method (GSAM). Results obtained with the application of the GSAM to the Perkin-Elmer Optima 3000 ICP atomic emission spectrometer are presented. The echelle-based polychromator with segmented-array charge-coupled device detectors enables the direct, visual examination of the overlapping lines Cd (1) 228.802 nm and As (1) 228.812 nm. The slit translation capability allows a large number of data points to be sampled, therefore, the advantage of noise averaging is gained. An ICP is extracted into a small quartz vacuum chamber through a sampling orifice in a water-cooled copper plate. Optical emission from the Mach disk region is measured with a new type of echelle spectrometer equipped with two segmented-array charge-coupled-device detectors, with an effort to improve the detection limits for simultaneous multielement analysis by ICP-AES.
- Research Organization:
- Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 174678
- Report Number(s):
- IS-T--1733; ON: DE96003727
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fundamental and analytical studies of optical emission from the Mach disk extracted from an ICP
Inductively coupled plasma-atomic emission spectroscopy: an alternative approach to ''flameless'' atomic absorption spectroscopy
In-situ droplet monitoring for self-tuning spectrometers
Conference
·
Fri Dec 30 23:00:00 EST 1994
·
OSTI ID:191716
Inductively coupled plasma-atomic emission spectroscopy: an alternative approach to ''flameless'' atomic absorption spectroscopy
Conference
·
Wed Dec 31 23:00:00 EST 1975
·
OSTI ID:7196966
In-situ droplet monitoring for self-tuning spectrometers
Patent
·
Tue Sep 28 00:00:00 EDT 2010
·
OSTI ID:1014555