Vapour Generation – an alternative technique in Atomic Absorption Spectroscopy

Trace metals are routinely analysed in ppm and ppb or even sub- ppb levels using conventional flame and graphite furnace Atomic Absorption Spectroscopy techniques. The vapour generation techniques offer an alternative for low-level determinations. Cold vapour technique for Mercury analysis Mercury is an element which has assumed global concern due to its high toxicity. It […]

Vapour Generation – an alternative technique in Atomic Absorption Spectroscopy

Trace metals are routinely analysed in ppm and ppb or even sub- ppb levels using conventional flame and graphite furnace Atomic Absorption Spectroscopy techniques. The vapour generation techniques offer an alternative for low-level determinations. Cold vapour technique for Mercury analysis Mercury is an element which has assumed global concern due to its high toxicity. It […]

Organic Solvents in Atomic Absorption Spectroscopy

Water is a universal solvent and is used in a majority of atomic absorption spectroscopic applications. Benefits of using water as solvent: Non-Toxic so no toxic fumes on ignition Non-flammable Constant physical parameters such as viscosity, density and specific Heat Apart from Its Safe Use constant physical parameters permit optimum use and design of nebulizers, […]

Dispersion of Light in Spectroscopy

Light sources of spectrometers generally emit a broad spectrum of wavelength bands which require to be separated into individual wavelength lines for use by the spectrometer. The component which plays the role of isolation of a single wavelength and directing it to the sample compartment is called the monochromator. The light dispersion element inside the […]

What Processes take place in the Flame during Atomic Absorption Analysis?

Most of you would have observed the changes in colour of the Atomic Absorption Spectroscopy flame on aspiration of sample into it and wondered as to what processes lead to such changes. A brief introduction to the phenomena has been made in the article Air or Nitrous oxide – which is the right oxidant gas for […]

Know the Performance Parameters of AAS Monochromator

Monochromator is a vital optical component of the Atomic Absorption Spectrometer. It plays the function of isolating the wavelengths of interest from the broad spectrum of wavelengths emanating from the hollow cathode lamp. For a brief description of monochromator component parts and their role browse through the article Dispersion and resolution of light in atomic […]

Comparison between Electrode-less Discharge Lamps and Hollow Cathode Lamps as light sources in AAS

Electrode – less discharge lamps provide high intensity (!0-100 times) and narrow emission lines which lead to higher signal – to -noise ratios over the lines obtained using hollow cathode lamps. Our earlier article Types of light sources in Atomic Absorption Spectroscopy covered the essential features of the two commonly used light sources – hollow […]

Multi Element Hollow Cathode Lamps – How they compare with Single Element Hollow Cathode Lamps? 

The light source used in Atomic Absorption Spectroscopy is unique. It looks like any other lamp but its uniqueness lies in the fact that its cathode is made of the same element which you have to determine in your sample. This means that you have to use a different lamp for every element whose analysis […]

Flow Spoiler or Impact Bead – which is the optimum choice in Flame AAS analysis?

A flow spoiler or an impact bead is positioned at the exit of the nebulizer stream in the spray chamber and it serves to remove the large droplets in the aerosol stream to the burner head and eventually into the flame. In Flame Atomic Absorption Spectroscopy the sample solution is never introduced as a stream […]

Influence of Burner Head Geometry on Flame characteristics in AAS analysis

The flame of the atomic absorption spectrometer is comparable to the absorption cell in an optical spectrometer. Atoms in the ground state serve as the light absorbing species. The absorption signal is dependent on flame length and number of absorbing ground state atoms in the light path. Role of AAS Burner has been briefly discussed […]

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