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Re: Seachem Iron Test Kit

>Date: Thu, 3 Apr 2003 16:50:38 -0500
>From: "Giancarlo Podio" <gp at isaconsulting_com>
>Subject: Seachem Iron Test Kit
>Hi all,
>I know this is going to be one of those stupid questions but I've read the
>instructions over and over and I know I'm not understanding something. I
>don't have much problem with the normal test (even though my wife always
>reads a different value than I do) but when it comes to the low-range test I
>just don't get it. (BTW this is the Seachem Multitest: Iron)
>It says to use one scoop of reagent in the low-range cuvette filled with
>water (0.5" from the top) and then wait 45 minutes and compare with color
>chart. I can never get a reading by doing this, the test is always clear.
>With the normal test I get 0.1-0.2 readings. So what am I doing wrong and
>how exactly does the low range test differ from the normal test?

Are you comparing it side by side to the blank cuvette (filled with 
water)? This is necessary to discern the very subtle color 
development when testing at the low range: From the instructions:

>  Place the blank sample cuvette next to the sample
>cuvette so that you can better distinguish the small changes in 
>color in the low range. For
>chelated iron, allow color to develop for 30 to 45 minutes or until 
>the color no longer darkens.

The low range test is the same as the regular test, it is just run in 
a different container to allow for a longer path length to increase 
color saturation at the low end of the scale. If you are not testing 
chelated iron you do not need to wait 45 minutes



Gregory Morin, Ph.D.  ~~~~~~~Research Director~~~~~~~~~~~~~~
Seachem Laboratories, Inc.      www.seachem.com     888-SEACHEM