Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgSat, 06 Sep 2008 23:06:19 GMT20http://www.wef.org/TechnicalDiscussions/Topic9005-15-1.aspxThank you Thank you Thank you!! That's exactly what I wanted to hear.Tue, 29 Apr 2008 15:53:55 GMTwinghttp://www.wef.org/TechnicalDiscussions/Topic9005-15-1.aspxSo long as the reading is taken quickly monochloramine will not interfere at all. There is a very slight interference (<0.10 mg/L) if your monochloramine concentration is 2.5 mg/L or higher if the reading is delayed longer than about 30 seconds from addition of the powder. There is also a powder pillow for measuring only monochloramine and one for measuring ammonia if you need that information. <br>Tue, 29 Apr 2008 12:21:28 GMTChristopher Fairhttp://www.wef.org/TechnicalDiscussions/Topic9005-15-1.aspxI was curious if the free chlorine reagent contains anything to prevent interference from monochloramines. All I saw on the MSDS was a lot of "trade secret". Our water plants use chloramines and I don't know if we can trust our handheld colorimeters in the field when looking for free chlorine.</P><P>Thanks</P><P>WingMon, 28 Apr 2008 11:12:54 GMTwing