PH Pen calibration Solutions

Discussion in 'Test Kits, Controllers, Reactors and Dosers' started by Sammy, 6 Jul 2008.

  1. Sammy

    Sammy

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    Hi Guys,

    I've bought a pH pen on ebay over in the UK. This unfortunatly did not come with the pH 7 and pH 4 buffer solutions for calibration ?

    Would u guys have ANY idea where I could get hold of those solutions in order to calibrate my meter ?

    Cheers
     
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  3. Mekaeel

    Mekaeel Moderator MASA Contributor

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    most of our sponsors stock the calibration fluids.even most LFS for that matter ;)
     
  4. Sammy

    Sammy Thread Starter

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    ok cool !!!
     
  5. Reef Maniac

    Reef Maniac MASA Contributor

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    You can ake your own 'checking' solution very easily (and cheaply...):

    Mix 3.8 grams of Borax into 1 liter of RO water. (buy the borax at you local chemist, and ask him to weigh off the amount for you...).

    This solution has a very stable pH of 9.18 at 25°C (and only varies from 9.23 to 9.14 between 20°C and 30°C), and it is thus ideal to check if the pH calibration is correct.

    HTH
    Hennie
     
  6. Mekaeel

    Mekaeel Moderator MASA Contributor

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    awsome info Hennie!what about ph 4?
     
  7. Clownfish9906

    Clownfish9906

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    bump
     
  8. DeanT

    DeanT Dean

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    Just make your own solution and tst it using a test kit
    Use vinegar which has a ph of about 2,5 and use a alkaline to neutralize it and this will bring the ph closer to 4 or 5

    I calibrated my ph probe over the weekend using ro water and and watered down vinegar

    Worked perfectly
     
  9. Albert Terego

    Albert Terego

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    I would not trust this method at all...

    Here's a link to making your own http://www.ffcr.or.jp/zaidan/ffcrho...46fd852cd5e269049256f32001a133e/$FILE/B30.pdf

    but really purchasing a std is really so much easier. We spend so much on our systems and livestock - why skimp and possibly mess everything up for the sake of a R100 or so.
     
  10. DeanT

    DeanT Dean

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    as long as you are able to verify the PH of a liquid using a test kit , i dont see the problem in using liquids you have access to .

    if you test a liquid and the kit indicates the PH is X , then great , you now know the PH verified with the kit , and therfore you can use it to calibtrate the pen.

    i understand about skimping on R 100 but why waste this , just to use it once , when we have access to so many different liquids with different PH.
    just think about the liquids you have around your house , and you will find that there is more than enough to choose from.

    i my case , i bought a PH probe , it had no indication of the PH in the bottle it shipped with .
    so one who assume it would be 7 pr 8 .
    so i tested it with a test kit , and it ended up being 4.5.

    the bottom line , if you can verify a liquids PH , then i dont see why you cant use it
     
  11. Albert Terego

    Albert Terego

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    It's just that I don't think using a test kit which you have to interpret colours would be an accurate enough to use as std to calibrate a pH pen.

    That's like using a matchbox to measure the length of a ruler.

    I don't disagree with the idea verifying the pH of a common liquid and using thsi as a further std, but I dont agree that the pH should be verified with a pH test kit.
     
  12. jimilutz

    jimilutz

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    I was looking for calibration fluids or accurate buffering solutions and my LFS guy suggested I use mineral water as the ph is on the label and I would presume they would use accurate lab equipment. I checked two bottles of still and sparkling water and saw there is a decent variation between the two due to the co2 addition. This seems like a cheap and easy solution.
     
  13. Perky Pets

    Perky Pets Sponsor

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    AD sells the 4 and 7 calibration fluid.
     
  14. jimilutz

    jimilutz

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    I am a little bit of a noob here. What is AD? A fish store in Randburg perhaps?
     
  15. Albert Terego

    Albert Terego

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    Double Post
     
    Last edited: 7 Mar 2013
  16. Albert Terego

    Albert Terego

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    Labels are printed in bulk - not for each batch -the pH of the water in the bottle may be quite different from that on the label as the values on labels are only "typical" values.
     
  17. Perky Pets

    Perky Pets Sponsor

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    its a sponsor , ( wholesaler )
     
  18. Phpen

    Phpen

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    Am searching for a wholesaler of Dymax ph pen P-20 does anyone know in jhb
     
  19. adrian_87

    adrian_87

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    I am confused whats the difference with the PH 4 and the PH7 ?

    I also ordered a ph pen online. I saw the buffer soultion at wild on pets by greenstone
     
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