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The threshold odour number (TON) for a water sample of 40 ml, diluted to standard 200 ml mixture, in which odour is just barely detectable to the sense of smell, is
  • a)
    8    
  • b)
    5
  • c)
    50    
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The threshold odour number (TON) for a water sample of 40 ml, diluted ...
Threshold odour number represents the dilution ratio at which the odour is hardly detectable
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The threshold odour number (TON) for a water sample of 40 ml, diluted ...
Explanation:
Threshold odour number (TON) is defined as the number of parts of the sample that must be diluted with a specified odour-free water to render the odour just detectable to the sense of smell.

Given data:
Volume of water sample, V1 = 40 ml
Dilution factor, D = 200/40 = 5

To find TON, we need to determine the number of parts of odour-free water that must be added to the water sample to make the odour just detectable.

Since the dilution factor is 5, we need to add 4 parts of odour-free water to 1 part of the water sample to obtain the standard 200 ml mixture.

Therefore, the TON for the water sample is 5, which is option (b).
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The threshold odour number (TON) for a water sample of 40 ml, diluted ...
B
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The threshold odour number (TON) for a water sample of 40 ml, diluted to standard 200 ml mixture, in which odour is just barely detectable to the sense of smell, isa)8 b)5c)50 d)None of theseCorrect answer is option 'B'. Can you explain this answer?
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