Understanding Water Quality Measurement Instruments

The question asks about the specific instrument used to measure the odour of water. Understanding the instruments used for various water quality parameters is crucial in environmental engineering and water treatment.

Identifying the Instrument for Odour Measurement

Different instruments are used to measure different properties of water. Let's look at the options provided and determine which one is related to measuring odour.

• Olfactometer: An olfactometer is an instrument used to detect and measure odour. It can be used to assess the intensity and characteristics of odours in various substances, including water. In the context of water quality, olfactometers are specifically designed to quantify the odour level.
• Potentiometer: A potentiometer is primarily used to measure electric potential (voltage) or to compare the electromotive forces of different cells. It is not used for measuring odour.
• Tintometer: A tintometer is an instrument used for measuring and specifying colour, particularly of liquids and transparent solids. It is not used for measuring odour.
• Gravimetric: Gravimetric analysis is a quantitative analytical method based on the measurement of mass. It is used to determine the amount of a substance by weighing a pure precipitate of the substance. This method is not used for measuring odour.

Based on the function of each instrument, the instrument specifically designed or used for the measurement of odour is the olfactometer.

Conclusion

Therefore, the instrument used for measurement of odour of water is the Olfactometer.