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Lab equipment

Discussion in 'Talk to Tom Barr' started by Anti-Pjerrot, May 20, 2007.

  1. Anti-Pjerrot

    Anti-Pjerrot Prolific Poster

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    I got this offer for a free spectrophotometer (http://www.gmi-inc.com/Genlab/shimadzu%20uv160.jpg) , but im not familiar with any assays related to freshwater (nitrate, phosphate ect.)

    I thought i would get it if i could use it to accuratly measure my watervalues, but if not i dont want to bother...

    What do you say?
     
  2. Tom Barr

    Tom Barr Founder
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    It's a big old beast.

    Old too.

    Most folks are more inclined to use something like a Hach 890, or their 2800 spect.
    Hanna makes a simple colorimeter, the C200.

    These are generally much easier to use.

    They also sell reagents pre made, however, you can buy bulk reagents and do your own test following water methods outlines etc.

    I like buying the pre made stuff, and a simpler colorimeter is a bit more $$, but a lot simpler.

    If you plan on doing a lot of test, then the cheaper routes are best.

    But once a week etc, no.

    Lamott's chemical(no spect or colorimeter etc) test kits are quite good for NO3, PO4 I like the Hach.

    I use a thermo orion Accu IV, a Hach 890 and Beckman spect. I want to get the Hach 2800. I use a Hanna colorimeter for the K+.
    Hanna ISE pH/Thermo, calomel Redox reference meter, a Milwuakee O2 water and polargraphic probe for O2 on a YSI(no membrane issues).

    For CO2, I made a special O2 membrane for the pH probe and use the KH reference solution inside the pH probe and take the readings based on the ref KH and the pH.

    Overall, this can tell me a lot.
    BTW, lighting is easy to measure if you use a PAR metter, Apogee is the best deal there is bar none.

    299$ for a PAr light meter that's got a nice water proof probe.
    Better than the 1000-1500$ LiCOR.

    So there's chemicals, gases, light.
    I have scales, flask, and other items as well.

    Regards,
    Tom Barr
     
  3. detlef

    detlef Member

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    Tom,

    I am inclined to buy a Milwaukee as well. So please let me know why you mentioned you did not encounter membrane issues using this device? And what is a YSI good for?

    Sorry for bothering you with stupid questions......continued:D

    Best regards,
    Detlef
     
  4. Tom Barr

    Tom Barr Founder
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    You can buy the Milwaulk, for the $, it's pretty good.
    You do not need really precise measurements, just 0.1ppm is enough.

    Regards,
    Tom Barr
     
  5. detlef

    detlef Member

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    Thanks for replying, Tom. 0,1ppm precision for O2 measurement will certainly do for my purposes.

    The YSI? Young Scots For Independence? Well, I will find out on my own...

    Regards,
    Detlef
     
  6. Tom Barr

    Tom Barr Founder
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    Being Scot, I like it, but it's just a brand name for water and environmental monitoring.

    BTW, I am selling a nice new colorimeter on ebay similar to the Hach.

    Regards,
    Tom Barr
     

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