Description
Torch 2 Slot Demountable 310-12
P/N: 310-12
Cross Reference(s)
None Available
Instrument Compatibility:
PerkinElmer Optima 3X00 DV
Torch Detail:
Torch Body, 2 Slot, Demountable
What is the Role of the ICP Torch?
A plasma is an ionized gas, consisting of positively charged ions and free (unbound) electrons. The role of the plasma (ICP) in ICP-MS is to ionize the sample. In contrast to so-called ‘soft’ ionization sources in other forms of mass spectrometry, the ICP is a ‘hard’ ionization technique because it completely atomizes most molecules in the sample.
ICP-MS instruments use an argon plasma, although helium plasma is also an option. Although there are several advantages to using helium, argon is the gas of choice since the cost of helium is prohibitive.
What Makes the Torch Work?
Plasma forms at the end of three concentric quartz tubes, collectively known as the torch. Argon gas flows through all three tubes.
- The inner tube is the injector and contains the sample aerosol in a stream of argon that delivers the sample to the plasma.
- Concentric to this tube is another tube of argon. This is the auxiliary gas that forms the plasma.
- The outer argon tube is a cooling layer to prevent the torch from melting.
- The far end of the torch has a copper induction coil (or ‘load coil’) surrounding it that connects to a radio frequency (RF) generator.
How the ICP Torch Ionizes a Sample
The RF generator supplies power to the load coil, creating a high-frequency alternating current. This, in turn, induces a time-varying electromagnetic field in the torch. As a result, with argon gas flowing through the torch, the application of a high-voltage discharge (called a Tesla spark) ionizes a fraction of the argon atoms generating ions and electrons.
The electromagnetic field in the torch then acts on the ions and electrons. As a result, they accelerate and collide with other argon atoms. If these collisions impart enough energy, additional atoms ionize creating electrons and ions that propagate the cascade.
As a result, the movement of electrons and ions in the torch generates tremendous heat. The result is an ICP, which reaches a temperature of up to 10,000 Kelvin (hotter than the surface of the sun).
What Is PFA Inert?
PFA is frequently employed as an inert substance in sample equipment on geochemical or environmental analytical chemistry field sites to assist in avoiding trace amounts of metallic ion contamination.
Features of Torch 2 Slot Demountable 310-12.
Demountable Torch
The D-Torch is a robust and higher-performing alternative to both a single-piece and a semi-demountable quartz torch. The demountable design offers several benefits, including ease of maintenance, flexibility in configuration, and the ability to customize the torch setup for specific analytical requirements. Additionally, it allows for thorough cleaning and removal of any sample residues or contaminants that may accumulate during analysis.
2-Slot Torch
A two-slot ICP torch is a component used in ICP-OES (Optical Emission Spectroscopy) systems. Therefore, it’s designed with two slots to accommodate different viewing configurations for the plasma. This is where the sample is ionized and emits light at characteristic wavelengths that can be measured.
The two-slot torch typically refers to a torch with a slot for radial viewing, which can be part of a dual-view system allowing both radial and axial viewing. This design helps in handling tough samples with less cleaning and a longer torch lifetime. Some two-slot torches are also semi- or fully demountable, which can reduce operating costs by enabling parts like the outer tube or the injector to be replaced separately.
- Axially viewed systems, where the torch is oriented horizontally and viewed end-on, offering greater sensitivity.
- Radially viewed systems, where the torch is vertical and viewed from the side. This is the preference for complex high matrix samples and volatile organic solvents because the vertical orientation reduces matrix or carbon buildup on the torch.
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