What makes water safe/unsafe to drink?

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Discussion Overview

The discussion focuses on the safety of drinking water, exploring its molecular construction, components that may render it unsafe, and methods for testing water quality. The scope includes theoretical considerations, potential contaminants, and practical testing methods.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant investigates how the molecular construction of water affects its safety and seeks to identify unsafe components and testing methods.
  • Some participants identify bacteria and heavy metals as harmful to drinking water.
  • Another participant emphasizes that heavy metals and heavy metal oxides are particularly toxic, suggesting that concentrations over 1-2% may be harmful.
  • Concerns are raised about bacteria, viruses, and acid mine water as significant contaminants.
  • One participant notes the trade-off between the dangers of biological contaminants and potentially carcinogenic compounds like chloramines and halogens.
  • Another participant mentions that almost any inorganic chemical can be toxic in sufficient amounts in drinking water.
  • A reference is made to a previous discussion in Biology regarding drinking water safety, highlighting the importance of detection methods for contaminants.
  • A participant shares information about hyponatremia, a condition caused by excessive water consumption, illustrating a different aspect of water safety.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding what makes water unsafe to drink, with no consensus on specific components or testing methods. The discussion remains unresolved on the broader implications of water safety.

Contextual Notes

Limitations include the potential for missing assumptions about water safety, the dependence on definitions of contaminants, and unresolved details regarding testing methods.

decs
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i'm investigating how the molecular construction of water makes it safe for us to drink, what components would make it unsafe or 'less safe', and how i could test for these things.

Cheers,
 
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bacteria and heavy metals aren't good for drinking water.
 
Straight up,

Heavy metals, and heavy metal oxides are the worst.
Anything over 1-2% is toxic i think.

Bacteria and Viruses are up there,

Also, Acid Mine Water from mine drainage into Aquifers is really bad.

As for testing, distilling a water sample, and testing the precipatates accordingly is a laboursome way.
You could possibly use mass-spectroscopy.
 
we trade off the dangers of bacteria and viruses for other harmful (potentially carcinogenic) compounds such as chloramines and halogens.
 
almost any inorganic chemical is toxic in adequite amounts in drinking water.
 
We had a similar discussion in Biology a while back regarding drinking water safety, but not with any emphasis on detection of contaminants. You might want to refer back to that discussion for additional information on water treatment and issues regarding compounds formed during that treatment.

https://www.physicsforums.com/showthread.php?t=41740
 
Interesting thread.
 
Hello decs,

I've read about a student who died of drinking too much water,
he suffered from "hyponatremia":
http://www.accessexcellence.org/HHQ/qow/qow04/qow050314.html

Here another case:
http://www.washingtonpost.com/wp-dyn/content/article/2005/08/10/AR2005081001460.html
"Hyponatremia, an abnormally low salt concentration in the blood, occurs when a person loses a large amount of sodium or consumes a large amount of water. Hyponatremia in athletes is almost always caused by drinking too much water.

As the blood becomes increasingly diluted, water moves out of the bloodstream and into cells, which swell. The swelling of the brain is responsible for the symptoms of severe hyponatremia -- nausea, confusion, seizures and coma. If pressure inside the skull increases enough, the base of the brain is squeezed downward through where connects it to the spinal cord, causing death."
 
Ouch...
 

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