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      Permanent link:
      https://www.ias.ac.in/article/fulltext/seca/009/01/0078-0085

    • Keywords

       

      Turbidity; Triolein; Turbid Medium; Turbid Solution; Scale Reading

    • Abstract

       

      A new type of photoelectric nephelometer is described. The essential principle is the measurement of the intensity of scattered light coming from an illuminated column of turbid medium by a comparison with the light scattered from an invariable standard of turbidity (frosted glass) in a narrowly defined region of the spectrum with the aid of a quantitatively variable light diminution. Photoelectric cells are used to indicate equivalence of light.

      The use of two photocells activated by light from a single source apart from eliminating the personal error in observations avoids the errors of instability due to intensity fluctuations of the light source. The measurement through a sensitive and objective method of photometry by physical means (in the form of a variable light diaphragm) and the use of light filters for measurements in narrowly defined regions of the spectrum give greater precision.

      The accuracy of the apparatus is ± 2·4 per cent.

      The several applications of the apparatus are described.

    • Author Affiliations

       

      B N Singh1 N K Anantha Rao1

      1. Institute of Agricultural Research, Benares Hindu University, India
    • Dates

       
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