This representative block diagram for AAS is taken from here.Ī representative UV/Vis spectrometer block diagram is from this sourceīottom Line AAS needs a wavelength selector to ensure that the analytical line of interest is the only radiation hitting the detector and it minimizes the negative effects of radiation scattered in the flame.
The energy source most frequently used in atomic absorption spectroscopy is the hollow-cathode lamp. If you compare the block diagram of an AAS vs a typical visible spectrometer, you'll note that the wavelength selector is typically placed after the sample compartment for AAS to address these concerns about scattered light however the issue is not that significant in visible spectroscopy so the wavelength selector can be placed before the sample holder. this procedure improves the results obtained with individual lamps. Working of Hollow Cathode Lamp How HCL are used Hollow Cathode Lamps are ideal source of spectral lines that are used for testing in laboratories. Lajunen.Ī wavelength selector is needed in order to ensure that only one of the emission lines is being used for the analysis.Īdditionally, light can be scattered in the flame, which can introduce errors in the analysis if not eliminated. July 4th, 2018 The idea of this blog post is to cover working aspect of Hollow Cathode Lamps followed by its various advantages that fulfills Hollow Cathode Lamps’ usage in AAS. Here, for example, is the emission from a nickel HCL, taken from Spectrochemical Analysis by Atomic Absorption and Emission by L. The emission spectrum from HCLs have multiple lines. The AA-6880 can simultaneously light any two hollow cathode lamps. The first point to consider is what the source really looks like. The hollow cathode lamp (HCL) uses a cathode made of the element of interest with a low internal pressure of an inert gas.
Atomic absorption spectroscopy (AAS) uses a hollow cathode lamp (HCL) as a source, and HCLs are line sources therefore, if a line source is being used, why would an instrument need to be made more complex by adding a wavelength selector?
This means the same cathode lamp can be used to determine multiple elements during analysis, minimizing lamp changes and extending the elemental coverage. Whether you require a single dedicated element or a multi-element. Agilent multi element hollow cathode lamps have cathode compositions that feature up to 6 elements in combination.
#Hollow cathode lamp faas series
This question has lingered on the site for a long time, which is a shame because it is a good question to ask. For maximum flexibility from your Thermo Scientific iCE 3000 Series Atomic Absorption spectrometer, a huge range of pre-coded and un-coded Thermo Scientific Hollow Cathode Lamps are available, to handle your chosen elements for analysis.
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