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Which type of odor characteristic is NOT used for classifying the odor of a given water sample as per IS 3025 (part- 5) 1983?

  • The types of odor present in waste water vary widely.
  • The type of odor shall be ascribed by judging the degrees of sweetness, pungency, smokiness, and rottenness of the odor.
  • If the characteristic being judged is high in intensity, rate that characteristic as ‘100’; if | medium, rate it as 50; and if low, rate it as ‘0’.
  • Although one can also use intermediate ratings but it is normally avoided. The odor class can be established by comparison with the perception levels of odor characteristics shown in Table V.1 (BIS, 1983b).
  • Thus, if an odor is rated as ‘100" in sweetness, ‘50-100" in pungency, ‘0-100" in smokiness, and ‘50" in rottenness, the odor should be described as ‘estery’ or ‘alcoholic’.
  • Chemical types that produce these odors are used as guides in determining whether the odor should be reported as ‘estery’ or ‘alcoholic.
  • Degrees of turbidity are NOT used for classifying odour of a given water sample as per IS 3025 (part- 5) 1983.