28 Water Analysis:SAQ
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Questions and Answers

What is the principle behind Atomic Absorption Spectrometry?

Atoms in the ground state absorb light of a particular wavelength characteristic of the element.

How can suspended solids be estimated in a water sample?

By filtration.

What is Biochemical Oxygen Demand (BOD)?

The amount of dissolved oxygen in ppm consumed by biological action, when the sample is kept at 20°C, in the dark, over a period of 5 days.

What is the purpose of Atomic Absorption Spectrometry in water analysis?

<p>To measure the concentration of a particular element in a sample.</p> Signup and view all the answers

What is the effect of free chlorine on DPD in a swimming pool water sample?

<p>Oxidises DPD to form a red product</p> Signup and view all the answers

What is the purpose of adding ammonium molybdate to a phosphate-containing sample?

<p>Produces a yellow precipitate</p> Signup and view all the answers

What is the method used to measure dissolved oxygen (O₂) in a water sample?

<p>Winkler Titration</p> Signup and view all the answers

How can total hardness be measured?

<p>EDTA titration.</p> Signup and view all the answers

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