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  #601  
Old 17.03.2008, 18:28
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Re: Ask a Scientist

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There's been quite a bit of info and discussion on water quality both here and in the Swiss Tap Water thread but is there a good website providing the mineral breakdown of ground water and / or tap water in Switzerland beyond the concentration of calcium? I'd like to know about sodium, suplphate, bicarbonate, etc.
You can search for your postal code at Wasserqualität.ch to determine the nitrate concentration (legal limit is 40mg/l). They also link to your local provider which may have further informations about minerals.

I like the description of the tasting test. It seems they were written by an oenologist for water.


/JVC was quicker
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  #602  
Old 17.03.2008, 20:01
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Re: Ask a Scientist

That is a pretty good website so thanks to both of you. You can even get the expected current water quality for your house which is impressive. Unfortunatley no details on carbonate or sulphur but I think if I email the local water people they'll be able to give me the information.
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  #603  
Old 18.03.2008, 12:58
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Re: Ask a Scientist

Now is my time to shine! I study water quality at the Swiss Federal Institute of Aquatic Science and Technology (Eawag), so I should be able to put my hands on this info fast. But wait, I don't speak German (for all practical purposes) and the only websites I have found have already been mentioned.

I can offer two more websites for the Canton of Zurich:
http://www.stadt-zuerich.ch/internet/wvz/home.html
http://www.wasser.zh.ch/internet/bd/...a/de/home.html

Also, I can say that in general, Swiss water tends to be quite hard (lots of carbonate, calcium, and magnesium), but of some of the highest quality in the world. In many cases, Swiss drinking water is removed from a body of water through its banks (whether river or lake), via shallow wells nearby. This allows the soil to act like a natural filter, and in many cases, the resulting water doesn't even need chlorination. Put it this way: I study drinking water, and I gladly drink tap water.
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  #604  
Old 19.03.2008, 07:10
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Re: Ask a Scientist

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Now is my time to shine! I study water quality at the Swiss Federal Institute of Aquatic Science and Technology (Eawag), so I should be able to put my hands on this info fast. But wait, I don't speak German (for all practical purposes) and the only websites I have found have already been mentioned.

I can offer two more websites for the Canton of Zurich:
http://www.stadt-zuerich.ch/internet/wvz/home.html
http://www.wasser.zh.ch/internet/bd/...a/de/home.html

Also, I can say that in general, Swiss water tends to be quite hard (lots of carbonate, calcium, and magnesium), but of some of the highest quality in the world. In many cases, Swiss drinking water is removed from a body of water through its banks (whether river or lake), via shallow wells nearby. This allows the soil to act like a natural filter, and in many cases, the resulting water doesn't even need chlorination. Put it this way: I study drinking water, and I gladly drink tap water.
There seems to be plenty of info on the microorganism content but not on what I want (specifically for most areas of SG and ZH.

Now, as a student, I'm sure you'll see this as an irresistable challenge .

In particular, I would like typical concentrations of:

Ca
Mg
Na
SO4
HCO3
Cl


I would also like to know what would typically be the effect of adding 1 g/litre of the following into the equation:

CaSO4
NaCl
MgSO4
CaCl
NaHCO3
CaCO3

And those on the ball will be thinking I'm trying to Burtonise some water (very important in producing Pale Ales )

Could be free beers on the cards for the answers.....
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  #605  
Old 19.03.2008, 22:44
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Re: Ask a Scientist

You'll need a pretty good water chemist to answer that one. Or else download MINTEQ, an excellent free calculator of this sort of thing. I used it once for I-forget-what and then binned it. Off hand, you must be pretty close to getting a nasty white precipitate of calcium sulphate.

Now I know what "Burtonise" means, why not just chuck in too much calcium sulphate and leave it to soak for a while, then drain off the clear water before making beer with it? That way it should be close to the "percled through gypsum" that real Burton water goes through, so the Marston's site says.
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  #606  
Old 31.03.2008, 10:22
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Re: Ask a Scientist

Is the earth going to blow up tomorrow? ( or be eaten by a black hole ? )
.
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  #607  
Old 31.03.2008, 10:45
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Re: Ask a Scientist

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...And those on the ball will be thinking I'm trying to Burtonise some water (very important in producing Pale Ales )

Could be free beers on the cards for the answers.....
Er, why do this? Is it not preferential as an artist to use the resources you have to hand?
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  #608  
Old 31.03.2008, 11:20
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Re: Ask a Scientist

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Is the earth going to blow up tomorrow? ( or be eaten by a black hole ? )
.
Hmm. Let me check the calendar. Ah yes, what date is it tomorrow, again?
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  #609  
Old 31.03.2008, 13:49
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Re: Ask a Scientist

just to clear up my post a wee tiny bit... it was in reference to some guy in Hawaii filing a court order asking for an injunction against CERN possibly blowing up the world.

http://mobile.iht.com/articles/physics.1.11520991.xhtml
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  #610  
Old 31.03.2008, 13:54
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Re: Ask a Scientist

No. It's not*

dave

* declare something with complete confidence, knowing the odds are strongly with you, or that the other party will find it just as difficult to disprove what you say as you will to prove it. If you do this repeatedly you will become regarded as a guru. The occasions you get it wrong will be forgotten.


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Is the earth going to blow up tomorrow? ( or be eaten by a black hole ? )
.
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  #611  
Old 31.03.2008, 14:04
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Re: Ask a Scientist

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just to clear up my post a wee tiny bit... it was in reference to some guy in Hawaii filing a court order asking for an injunction against CERN possibly blowing up the world.

http://mobile.iht.com/articles/physics.1.11520991.xhtml
I know a minor worry was an 'Ice 9' type-of-thing with strange matter. That would really bring the party to a stop, but they reckon it's unlikely that they'd be able to make enough of the stuff fo gravity to stabilise it.
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  #612  
Old 31.03.2008, 14:30
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Re: Ask a Scientist

To make sure you keep as dry as possible when passing through a rain storm without any protection from it, should you run or walk and why? I used to know the answer to this but I have forgotten it and my grandson wants to know!
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  #613  
Old 31.03.2008, 14:48
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Re: Ask a Scientist

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I it's unlikely that they'd be able to make enough of the stuff fo gravity to stabilise it.
.
.
oh thats comforting then.. "unlikely"

lets see... CERN is about 5 miles off in that direction *pointing*... do you have any advice if I hear a really big bang?
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  #614  
Old 31.03.2008, 16:00
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Re: Ask a Scientist

Nah, it wouldn't be a bang. You'd just see everything between you and it changing into something else before you also became that something else. Think of the 'grey goo' scenario of nanotechnology, but on a nuclear level.
thing is, you really would have to have a lot of the stuff for gravity to stabilise it and you couldn't make much of it with the techniques they use there.
But if it does happen, could you give me phone call as I reckon I'd have just enough time to kick my supervisor in the nuts before I join the goo...
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  #615  
Old 31.03.2008, 16:18
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Re: Ask a Scientist

checklist for "grey-goo" day.
  1. phone my wife tell her I love her.
  2. phone my family back in the states and tell them I love them, well, ok.. some of them.
  3. phone Colonel Boris
  4. find my boss.

thanks Colonel.
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  #616  
Old 31.03.2008, 16:34
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Re: Ask a Scientist

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To make sure you keep as dry as possible when passing through a rain storm without any protection from it, should you run or walk and why? I used to know the answer to this but I have forgotten it and my grandson wants to know!
surely if you walked really slowly you'd get wetter than if you ran really fast.
Assuming the amount of rain falling is fixed for both walker and runner, the walker would spend more time in the rain, and therefore get wetter.

hmm on thinking about it though, the runner would splash more.
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Old 31.03.2008, 16:44
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Re: Ask a Scientist

If the rain was falling directly downward (it won't be, especially in a storm), then if you walk the amount of moisture you will absorb or deflect will depend on your cross-section downward as you walk during your exposure. If you run, then your exposure time will be reduced but your body front will be cutting though streams of water that otherwise have been deflected or absorbed by your hair. Try running with a small umbrella up during heavy rainfall to demonstrate . Your body will get wetter than if you walk.

If the rain is going sideways during the storm then its obviously a lot more complicated...

dave


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surely if you walked really slowly you'd get wetter than if you ran really fast.
Assuming the amount of rain falling is fixed for both walker and runner, the walker would spend more time in the rain, and therefore get wetter.
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  #618  
Old 31.03.2008, 18:15
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Re: Ask a Scientist

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Is the earth going to blow up tomorrow? ( or be eaten by a black hole ? )
.
If someone states that they're suing in a US jurisdiction instead of in CH in order to save money, would you bet on them making an even number of sign errors in their theoretical particle physics calculations?

Last edited by cnvr; 31.03.2008 at 18:23. Reason: better physics
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  #619  
Old 31.03.2008, 19:01
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Re: Ask a Scientist

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If you run, then your exposure time will be reduced but your body front will be cutting though streams of water that otherwise have been deflected or absorbed by your hair. Try running with a small umbrella up during heavy rainfall to demonstrate . Your body will get wetter than if you walk.

If the rain is going sideways during the storm then its obviously a lot more complicated...

dave
If your hair gets wet then that surely adds to your overall wetness?..are you saying that by running I am hitting the raindrops harder therefore they make me wetter?

If I am rectangle, then the amout of water I will get hit by is rectangle x water x time (till I get out of the rain.)
rectangle and water are the same the only change is the time..ie if I run or walk?

or have missed something in your answer?

This helped me,
http://www.straightdope.com/classics/a3_395.html
Run
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  #620  
Old 16.04.2008, 13:23
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Re: Ask a Scientist

Any biochemists or similar here? I've read in today's newspaper that antibiotics in the waste water are a problem. It wasn't mentioned though if the cause are properly used medicaments, or if people flush unwanted pills down the toilet instead of bringing them back to the pharmacy. What outstanding properties have the molecules of antibiotics, I wonder?
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