• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/sadh/025/01/0057-0069

    • Keywords

       

      Spectrochemical analysis; atomic emission spectrometer; inductively coupled plasma

    • 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.

    • Author Affiliations

       

      R P Shukla1 S S Bhattacharya1 D V Udupa1 T Jayasekharan1 P P Khanna1 S M Marathe1 Sampath Kumar1 M N Patil1 S V G Ravindranath1 Sandeep Guha1 2 M B Guhagarkar1 A P Roy1

      1. Spectroscopy Division, Bhabha Atomic Research Centre Trombay, Mumbai - 400085, India
      2. Central Workshop, Bhabha Atomic Research Centre Trombay, Mumbai - 400085, India
    • Dates

       
  • Sadhana | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.