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PPM Test strips. 09 Sep 2013 06:28 #35862

  • geocant
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Hello everyone, I am after info on where I can get the test strips used to determine the " parts per million" when making CDS, as it was used in the making of CDS video. I am in Australia and have tried MMS Australia but it is not listed. Thanks for any help.
geocant

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PPM Test strips. 10 Sep 2013 01:16 #35890

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Thanks Steve, on the video for the "overnight CD batch" it calls for 3000 parts per million test strips. The strips at Graingers are 500 ppm (#4EVX3) I will have another look at their site and do a search.
Thanks again for your help, George.

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PPM Test strips. 10 Sep 2013 03:43 #35893

  • JB13
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George, the 500ppm strips are the highest made.

Take 1ml of your CDS and put in 59ml of distilled water for a total of 60ml. That is a 1:60 dilution. Dip one LaMotte strip in the diluted solution for 2 full seconds, take out and wait 10 seconds. If your CDS is 3000ppm the strip color will match the 50ppm color on the LaMotte plastic case. 50ppm x 60 = 3000ppm

You can cut the strips lengthwise so you end up with 100 strips instead of 50.
The following user(s) said Thank You: pam, fourfingerz

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PPM Test strips. 10 Sep 2013 05:32 #35895

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Thanks JB13, I understand now. Will order soon.
Cheers, George.

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PPM Test strips. 10 Sep 2013 14:35 #35906

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You will find that the colors may be approximate - and worry a bit about an exact match - I wouldn't worry close is close enough. I also don't worry about the difference between 59mL in my water or 60mL in my water - it's easy to find measures that measure 30mL or 60mL here in the states, but you have to purchase lab equipment to measure 59mL - so I just use 60. As Jim has said, this is not rocket science. <G>

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PPM Test strips. 11 Sep 2013 01:06 #35926

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Thanks Pam, I have a small digital scale, it might be better to weigh the 59-60 grams/mls. Anyway I suppose the accuracy is only as good as the test strips, and that is only a visual thing.
Cheers, George.

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