Design, fabrication and performance evaluation of a 22-channel direct reading atomic emission spectrometer using inductively coupled plasma as a source of excitation |
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Authors: | R P Shukla S S Bhattacharya D V Udupa T Jayasekharan P P Khanna S M Marathe Sampath Kumar M N Patil S V G Ravindranath Sandeep Guha M B Guhagarkar A P Roy |
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Affiliation: | (1) Spectroscopy Division, Bhabha Atomic Research Centre Trombay, 400085 Mumbai, India;(2) Central Workshop, Bhabha Atomic Research Centre Trombay, 400085 Mumbai, India |
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Abstract: | The indigenous design, fabrication and performance evaluation of a polychromator, using inductively coupled plasma (ICP) as
a source of excitation, are described. A concave holographic grating is used as the dispersing element and a Paschen — Runge
mount is chosen to focus the spectra over a wide range along the Rowland circle. Twenty-two exit slits, mounted along the
circle, precisely correspond to the wavelengths used for determination of up to twenty elements present in the plasma. Radiations
emerging from the exit slits are detected by photomultiplier tubes placed behind them. The photomultiplier signal is recorded
by an electronic system consisting of an integrator and a PC-based data acquisition system. The performance of the spectrometer
has been evaluated with an ICP excitation source. Synthetic standards in deionized water containing a mixture of twenty impurities
have been analysed. Typical determination limits observed for elements range from sub-ppm to ppm levels. All the elements
present as impurities can be detected simultaneously. It is also observed that each element has a different emitting region
in the ICP flame for which the maximum signal to the background is obtained. The determination limits obtained corresponding
to these zones are the lowest. A study of the sensitive emitting zones for several elements has been carried out and the results
are demonstrated by photographs of the ICP flame. The study will help in achieving the minimum value of determination limit
for an impurity element. |
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Keywords: | Spectrochemical analysis atomic emission spectrometer inductively coupled plasma |
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