ShakerD Posted September 12, 2011 Report Share Posted September 12, 2011 I did all the tests in the kit but I am having a hard time understanding the FC test. Step two says to "2. Add 2 dippers R-0870. Swirl until dissolved. If free chlorine is present, sample will turn pink." Is that two dippers at 25ml or at 10 ml ? Is that 2 level dippers? Thanks Test reads Chlorine (Free, Combined) Test 1. Rinse and fill large comparator tube to desired mark with water to be tested. NOTE: For 1 drop = 0.2 ppm, use 25 mL sample. For 1 drop = 0.5 ppm, use 10 mL sample. 2. Add 2 dippers R-0870. Swirl until dissolved. If free chlorine is present, sample will turn pink. NOTE: If pink color disappears, add R-0870 until color turns pink. 3. Add R-0871 dropwise, swirling and counting after each drop, until color changes from pink to colorless. 4. Multiply drops in Step 3 by drop equivalence (Step 1). Record as parts per million (ppm) free chlorine (FC). 5. Add 5 drops R-0003. Swirl to mix. If combined chlorine is present, sample will turn pink. 6. Add R-0871 dropwise, swirling and counting after each drop, until color changes from pink to colorless. 7. Multiply drops in Step 6 by drop equivalence (Step 1). Record as ppm combined chlorine (CC). Quote Link to comment Share on other sites More sharing options...
chem geek Posted September 12, 2011 Report Share Posted September 12, 2011 Is that two dippers at 25ml or at 10 ml ? Is that 2 level dippers? The number of dippers or exact amount of DPD powder doesn't matter very much for the FAS-DPD chlorine test. 2 fairly level dippers for a 25 ml sample size is fine as is 1 dipper for a 10 ml sample size. You just need enough to get a reasonably rich color so that the transition to clear will be fairly distinct. If the chlorine level is exceptionally high such that the powder bleaches out (i.e. you get a flash of pink and then it goes clear), then you can add more powder until you get a color that holds. Quote Link to comment Share on other sites More sharing options...
ShakerD Posted September 13, 2011 Author Report Share Posted September 13, 2011 Is that two dippers at 25ml or at 10 ml ? Is that 2 level dippers? The number of dippers or exact amount of DPD powder doesn't matter very much for the FAS-DPD chlorine test. 2 fairly level dippers for a 25 ml sample size is fine as is 1 dipper for a 10 ml sample size. You just need enough to get a reasonably rich color so that the transition to clear will be fairly distinct. If the chlorine level is exceptionally high such that the powder bleaches out (i.e. you get a flash of pink and then it goes clear), then you can add more powder until you get a color that holds. Thanks Chem Geek Quote Link to comment Share on other sites More sharing options...
ShakerD Posted September 13, 2011 Author Report Share Posted September 13, 2011 For anyone else here are a bunch of Taylor videos step by step http://www.taylortechnologies.com/products_choose_slideshow.asp Quote Link to comment Share on other sites More sharing options...
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