Re: [Killietalk] Daphnia and chloramine

["wm crash" <wm_crash at hotmail_com>]

Hi Lee,

It turns out the measurements were obtained using a chlorine test (part of 
Deluxe Freshwater Lab made by Red Sea). I thought I measured the Cl2; then 
after bubbling it for days without a decrease in the test reading, I 
concluded it must be chloramine, but I kept the numbers. This website says 
that the product is an indicator for both chlorine and chloramine:

http://www.aquariumpros.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=APG&Product_Code=RS25100

Quote: "Chlorine 60 Tests - Indicates presence of as little as 0.05 ppm of 
chlorine in freshwater. Also measures total chlorine in the form of 
chloramine. Great for tap water."

There are separate color codes for 0 ppm, 0.05 ppm, 0.1 ppm, and 0.5 ppm.

I also had some chlorine/chloramine test strips a while back that were 
giving even better resolution at the lower concentration. A little bit hard 
to read, since the color codes were shades of yellow and shades of gray.

Now coming back to AmQuel, I have seen enough people point at it as a cause 
of Daphnia crashing. I have also seen it called very invertebrate friendly 
in places such as this one:
http://www.aquaticeco.com/index.cfm/fuseaction/product.detail/iid/5673/cid/1596

I will try some experiments in the next few days but not with daphnia. I 
have a good supply of live cyclops. That should give a rough idea of what 
might happen to daphnia.

cheers,
wm_crash, the friendly hooligan
AKA #08840, SAA #162, SVAS #120, HOOLIGAN #1
Wilmington, DE

>In a message dated 1/10/07 12:36:42 AM, wm_crash at hotmail_com writes:
>
><< I have a tap water that is much less than 0.5 ppm chloramine, but 
>slightly
>over 0.1 ppm (numbers come from the test's color chart).  >>
>
>Amquel and other dechlorinators that are based on formaldehyde derivatives
>are deadly for daphnia. I use an activated carbon filter or sodium 
>thiosulfate
>to remove chlorine and chloramine. Where did you find a test kit that is 
>able
>to measure 0.1-0.5 ppm? My water has about 10 times that amount and it is
>detectable only at 1.0 ppm. The water company claims about 2 ppm. Are you 
>sure of
>the decimal point?
>
>Lee Harper
>Media PA

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