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Quartz Trpple distrilled water

W

WayneL

Jan 1, 1970
0
Hi

Can anyone advise where I can get Quartz triple distilled water from (I'm in
the UK) and what is it the best conductivity you could expect from the most
purest water
Also what is the best way of 1/ storing ultra pure water and 2/ dispensing
it so that the rest of the water does not get contaminated. Should I
dispense it in to several small bottles with pipette lids?




Cheers

Wayne
 
J

John Fields

Jan 1, 1970
0
Hi

Can anyone advise where I can get Quartz triple distilled water from (I'm in
the UK) and what is it the best conductivity you could expect from the most
purest water
 
W

WayneL

Jan 1, 1970
0
Thanks,

I have used google, but I am after water with an R>18MR.

Wayne
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that WayneL <[email protected]>
wrote (in said:
I have used google, but I am after water with an R>18MR.

Try asking the National Physical Laboratory. Few people talk to them
(scientists, you know), so your enquiry will be welcomed. (;-)
 
A

Active8

Jan 1, 1970
0
I read in sci.electronics.design that WayneL <[email protected]>


Try asking the National Physical Laboratory. Few people talk to them
(scientists, you know), so your enquiry will be welcomed. (;-)

LOL. Bureaucrats are the same all over I guess. Your corp. CEO, CTO,
CIO will most likely too buzy to answer questions. His Fed
countepart, even down to the CIO in charge of a roadside info shack,
will have plenty of time and info. YMMV on the info product but
they'll at least help you figure out who to call next.
 
C

Charles Jean

Jan 1, 1970
0
Hi

Can anyone advise where I can get Quartz triple distilled water from (I'm in
the UK) and what is it the best conductivity you could expect from the most
purest water
Also what is the best way of 1/ storing ultra pure water and 2/ dispensing
it so that the rest of the water does not get contaminated. Should I
dispense it in to several small bottles with pipette lids?




Cheers

Wayne
___
Highest resistivity you can get is about 18.3 megohm-cm at 25 deg C.
Self-ionization of water limits it to any higher value. This type of
water can be produced by triple distillation in quartz apparatus or by
mixed-bed deionization(much easier).
Keeping it this way is tough, because it will have a tendency to
dissolve the countainer it is in and absorb atomspheric gasses,
especially carbon dioxide. I've seen a demineralizer setup that
produced 18.3 megohm-cm water(as measured by an in-line probe) that
would measure around 5 after falling through about a foot of air!
Purging the container with an inert gas, like argon would help with
this, but then you'd have to he concerned about contaminants in the
argon, etc. Some argon would dissolve in the water, but couldn't be
measured by conductivity. Also there my be organic compounds present
that can't be measured by conductivity. What is your application for
this water?
GRAVITY:

It's not just a good idea-IT'S THE LAW!
 
R

Roger Hamlett

Jan 1, 1970
0
John Woodgate said:
I read in sci.electronics.design that WayneL <[email protected]>
Make your own!...
Most labs using hyper/ultra pure water have small machines to do just
this. If you can find a company near you, involved in the preparation of
chemical reagants, they may be prepared to sell you some. The problem is
that if you 'buy' such water, it is incredibly difficult to keep it this
pure. Normal bottles will contaminate it in only a few minutes (so you end
up paying a lot for special containers - teflon coated linings). Do a
search through the companies offering laboratory reverse osmosis systems.
If one is near you, talk to them.
It is not something that is easy to ship, and retain the purity.

Best Wishes
 
G

Guy Macon

Jan 1, 1970
0
See thread titled "Guy Macon's adventures with ultrapure water".
 
R

Robert Baer

Jan 1, 1970
0
Roger said:
Make your own!...
Most labs using hyper/ultra pure water have small machines to do just
this. If you can find a company near you, involved in the preparation of
chemical reagants, they may be prepared to sell you some. The problem is
that if you 'buy' such water, it is incredibly difficult to keep it this
pure. Normal bottles will contaminate it in only a few minutes (so you end
up paying a lot for special containers - teflon coated linings). Do a
search through the companies offering laboratory reverse osmosis systems.
If one is near you, talk to them.
It is not something that is easy to ship, and retain the purity.

Best Wishes

Yes; the more pure the water is, the more corrosive it becomes
(relatively speaking).
Water is the universal solvent; even mountains turn into virtual
molehills when doused with water.
Water is a polar molecule, acid (H) and base (OH) combined.
 
B

beavith

Jan 1, 1970
0
Yes; the more pure the water is, the more corrosive it becomes
(relatively speaking).
?
no.

Water is the universal solvent; even mountains turn into virtual
molehills when doused with water.

??
you seem to mixing your metaphors. it rains on mountains all the
time.
i wonder how long water would take to dissolve Pt.
Water is a polar molecule, acid (H) and base (OH) combined.

???
so what?


while you're at it, can a strong magnet clamped on a pipe remove water
hardness?


sheeshh!
 
D

Dieter Britz

Jan 1, 1970
0
beavith said:
Roger said:
"John Woodgate" <[email protected]> wrote in message
[...]
Yes; the more pure the water is, the more corrosive it becomes
(relatively speaking).


?
no.

Well, it depends on what you mean by corrosive. In one sense, this
would be correct, because if you want really ultrapure water, then
as it gets purer, any corrosion of whatever it is in (quartz,
glass) or is in it (Pt) would matter more. But the actual amount
of metallic corrosion will decrease with increasing water purity, while
the dissolution of components out of the cell walls would be about
constant.

Well, universal shmersal. Like all other solvents, it probably dissolves
anything to some extent, but that is not what we mean by universal. It
is, though, a pretty good solvent.
i wonder how long water would take to dissolve Pt.

A long time {:]. In cold fusion experiments, where they electrolyse
for days on end, using a Pt anode, they end up with traces of Pt on
the Pd cathode, which wasn't there before (the Pt I mean).
???
so what?

Well, (again playing the pedantic Devil's advocate) it means that there
is small concentration of H+ ions (OK, H3O+ for the other pedant) plus
OH- ions, and the H+ ions will favour a bit of corrosion; so will any
small amounts of O2. But the ions are a result of the polar nature of
H2O.
 
A

Angelo Campanella

Jan 1, 1970
0
WayneL said:
Can anyone advise where I can get Quartz triple distilled water from (I'm in
the UK) and what is it the best conductivity you could expect from the most
purest water

The purer, the higher the resistance.
See other messages here (18 megohm-cm, etc.)
Also what is the best way of 1/ storing ultra pure water and 2/ dispensing
it so that the rest of the water does not get contaminated. Should I
dispense it in to several small bottles with pipette lids?

Bottle material is important.
Can't say which is the best; it's not obvious.

Angelo Campanella
 
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