FAS-DPD Test

[GraceByDesign]

....
There is one more thing you could help me with. I don't understand Step 1. of your instructions. It simply doesn't compute, i.e., what does it mean "For 1 drop = 0.2 ppm, use 25 mL sample. For 1 drop = 0.5 ppm, use 10 mL sample." I must not recall this from Ben's 2005 kit or we just didn't have the option. In any case, this will clearly become important because of the 'drop equivalence' in Step 4. Can you expound on for my brain block? Thanks again -

If you use a 25ml sample, each drop you add in step 3 represents .2ppm FC (this is the 'drop equivanlece') so multiply # drops in step 3 by .2 to get ppm FC.
Same for step 7... for a 25 ml sample, drop equivalence is .2

If you use a 10ml sample, each drop represents .5ppm FC. This method requires fewer drops, but would also be slightly less accurate.

[CarlD]

I simply cut-and-pasted the directions directly from Taylor.

If you fill your sample tube to the 25 ml mark, each drop of titration fluid counts as .2 ppm. So you need 5 drops for each 1ppm.

If you fill to 10 ml, then each drop represents .5ppm and you need 2 drops for each 1ppm.

[elsie]

Ok you guyses, I get it. It's the same thing I do now. What threw me off was that the Taylor folk evidentally put this "note" smack underneath the first step, so my mind was trying to tie it in with that first step. Added to that was the word "multiply" when I use division for the FAS-DPD test. Of course, in this application, they are one and the same as long as you move the decimal point.

Thanks all for helping with this (and my cognitive deficit)! I truly appreciate it.

[Poconos]

Check this place too...good prices and the reagents I got a couple years ago were shipped directly from Taylor.
Al

http://www.spspools-spas.com/