Research assignment (1 Viewer)

[Tim035]

EDIT: Just realised The guide to water management and monitoring at the top of this forum answers most of my questions ..


Hey, I'm in no way asking for direct answers to these questions that are part of my research assingment but any info, websites etc etc would be awesome and save me a lot of google searching lol.

- Identify sources of heavy metal contamination and outline how these can enter our water ways.
- Describe a test for heavy metal contamination or water ways.
- Present information on the tests used to monitor eutrophication of water ways.
- Explain the science used in a microscopic membrane filter and outline how such a filter is used to purify water.
- Include a diagram which illustrates how a microscopic membrane filter works.

The text book does a preety good job at most of these but unfortunatly he said he would deduct marks for just info from the text book summarised as he wants us to use a variety of sources and answer the questions in a thorough manner.

 

[Petinga]

- the only source of heavy metal contamination i can think of currently is the leaching from rubbish dumps containing batteries etc resulting in cadmiun and lead being flushed into local waterways by rain.
- a test used to determine the presence of heavy metals such as those above would be to acidify a solution of the water and a add a few drops of sodium sulfide. If these heavy metals are present a white precipitate should be formed.
-Eutrophication of local waterways can be monitored using dissolved oxygen and BOD tests. Thus if extent of eutrophication is great then o2 levels should be low with high BOD levels due large numbers of algae present.
- Microscopic membrane filters are composed of thin polymer sheets such as polypropylene and teflon, wrapped around or folded around a central rigid core with mesh surroiunding. Water is made to flow across the surface of the filter, resulitn in particles being caught on outside and clean water passing through the centre. Thus water is purified.
- a good diagram is located on the chemistry contexts textbook, excel revison guide as well

hope this brief description of each helps u