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Quartz Trpple distrilled water

Discussion in 'Electronic Basics' started by WayneL, Jan 4, 2005.

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  1. WayneL

    WayneL Guest

    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
     
  2. John Fields

    John Fields Guest

     
  3. WayneL

    WayneL Guest

    Thanks,

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

    Wayne
     
  4. I read in sci.electronics.design that WayneL <>
    Try asking the National Physical Laboratory. Few people talk to them
    (scientists, you know), so your enquiry will be welcomed. (;-)
     
  5. Active8

    Active8 Guest

    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.
     
  6. Charles Jean

    Charles Jean Guest

    ___
    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!
     
  7. 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
     
  8. Guy Macon

    Guy Macon Guest

    See thread titled "Guy Macon's adventures with ultrapure water".
     
  9. Robert Baer

    Robert Baer Guest

    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.
     
  10. beavith

    beavith Guest

    ??
    you seem to mixing your metaphors. it rains on mountains all the
    time.
    i wonder how long water would take to dissolve Pt.
    ???
    so what?


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


    sheeshh!
     
  11. Dieter Britz

    Dieter Britz Guest

    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.
    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).
    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.
     
  12. The purer, the higher the resistance.
    See other messages here (18 megohm-cm, etc.)
    Bottle material is important.
    Can't say which is the best; it's not obvious.

    Angelo Campanella
     
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