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Questions and Answers
In argon plasma, our sample will be ______ & ionized
atomized
ICP-OES uses ______ to determine the composition of elements in a sample
plasma & spectrometer
The device which produces the IC plasma is commonly referred to as the ICP ______
torch
The excitation temperature of argon ICP is ______ - 7000 K, which efficiently excites many elements
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The argon and analyte flow into a radio frequency (RF) field, usually at 40.68 ______
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After leaving injector, sample moves at high velocity and punches hole in centre of ______
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Sample is turned into aerosol by ______
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Aerosol vapour is transported to the plasma. Vapour desolvates and mixes with the plasma. Atomization occurs within the plasma. Atoms get excited to atomic and ionic states. Rich spectra produced because of presence of both atomic and ionic lines. Because of their different excitation energies, different emission lines will have maximum intensities at different vertical positions in the plasma. The droplets coming from the nebuliser can vary greatly in size, from less than 1 µm to more than 10 µm. Since droplets going into the IC plasma should be kept below 5 µm in size, it is necessary to remove the large droplets. This is done in a ______. The liquid spray from the nebuliser enters the spray chamber. By sheer size, the larger droplets fall to the bottom of the chamber and exit through the drain. The finer droplets in the vapour are transported to the plasma.
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Atomisation / Ionisation In plasma, sample moves through several zones: Zone Temperature (K) Preheating zone (PHZ) 8000 Desolvation/evaporation Initial radiation zone (IRZ) 6500-7500 Vaporisation, Atomisation Normal analytical zone (NAZ) 6000-6500 ______ Spray chamber 25 Detection limits 26 Application
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ICP-OES used for quantitative analysis of: Soil, sediment, rocks, minerals, air Geochemistry Mineralogy Agriculture Forestry Forensics (Hair analysis) Environmental sciences Food ______
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