I have a Taylor K-2006 test kit which uses DPD powder for the free chlorine test. There are 2 options for volume of water sample- 10 ml and 25 ml. Two dippers of powder are specified for the test in both cases. Would 1 dipper be sufficient for the 10 ml samle? Also, sometimes a small amount of the powder will not dissolve, even when shaken vigorously. Will this affect the test results?
DPD powder questions
- Thread starter salvationarmy
- Start date
Yes, the small side is for the smaller sample size.
No, not having it all dissolve will not affect the test results.
No, not having it all dissolve will not affect the test results.
Melt In The Sun said:
Thanks for your reply. My scoop only has one size, one measure. One end is a flat rectangle and the other is a small scoop.
Mike
Oh, duh...brain fart there. The flat side is the handle. You can use the 25 mL sample size to get 0.2 ppm resolution on the test, but few people ever do since it's not really necessary.
As long as the solution turns pink and remains pink (until you count the drops of R-0871), then the powder was adequate. So, yes, you can sometimes get by with one scoop.
duraleigh said:
Doesn't the TF-50 DPD powder call for ONE heaping scoop for either 10 ml or 25 ml sample?
The TF-100 assumes you will do a 10ml test and suggests one heaping scoop. The kit does not contain instructions for the 25ml test.
Regardless, the important info to take away from this is it doesn't matter exactly how much powder you use. As long as the solution turns pink and stays pink, the test is valid!
Regardless, the important info to take away from this is it doesn't matter exactly how much powder you use. As long as the solution turns pink and stays pink, the test is valid!
Less than 1 scoop (half even) has always worked for me so far. I'm baffled that it could possibly take more than one level scoop, however I have a theory that it has to do with chlorine levels.
Our water has never been below 3ppm when using it, so I do not know if it might take two whole heaping scoops if one had less chlorine than that. The large chunks do not dissolve for me either, nor do they work to turn the water pink if the scoop only contains large chunks.
Our water has never been below 3ppm when using it, so I do not know if it might take two whole heaping scoops if one had less chlorine than that. The large chunks do not dissolve for me either, nor do they work to turn the water pink if the scoop only contains large chunks.
It does have to do with the TC level. The higher the TC level you are trying to measure the more powder you need.
Oh, ok. I was thinking the opposite. That more FC meant less powder needed. Good to know. Thank you Jason.
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