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The aim of this experiment is to measure the BOD and DO of water.

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  • Essay length: 1522 words
  • Submitted: 27/08/2003
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AS and A Level Probability & Statistics

The first 200 words of this essay...

Experiment #14

December 17/2002

DO and BOD Winkler titration

AIM:

The aim of this experiment is to measure the BOD and DO of water.

INTRODUCTION:

The quality of water depends on several factors including oxygen-demanding wastes, disease-causing pathogens, microorganisms affecting health, plant nutrients, suspended solids and dissolved minerals. Other pollutants may be excess acidity due to acid rain, thermal pollution and substances such as benzene, chromium and mercury that are all toxic to aquatic life.

As humans and land animals obtain oxygen from respiration from the air, for plants and animals to survive in aquatic systems, water must contain a minimum amount of dissolved oxygen. The dissolved oxygen (DO) content of a body of water is an important indicator of its quality. At 200C, DO content of 8 to 9 ppm O2 at sea level is considered to be water of good quality.

The Biochemical Oxygen Demand (BOD) is a measure of the amount of oxygen consumed by the biodegradable organic wastes and ammonia in a given amount of water over a time period, normally 5 days at 200C. The greater the oxygen demanding wastes, the higher the BOD.

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