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Re: Calcium test kits
> Our Reef Status: Calcium kit is (like the magnesium kit) marketed
> toward the saltwater hobbyist, but can be used in freshwater just
> as well. In fact it could be used in the same manner as the other
> kits you described, i.e. you can skip the magnesium precipitation
> step to get a total hardness,
I must apologize for relaying the above information with respect to
the total hardness testing ability of the Reef Status Calcium kit...
I had assumed this was possible without any test kit modifications,
however upon actually trying to read total hardness with the calcium
kit I found that no reading is possible with the current formulation
of the kit. Further investigation revealed that this dye is actually
quite insensitive to magnesium.
Anyway, I apologize for posting misleading information... guess this
will teach me not to go and shoot my mouth off before I have _fully_
investigated any ideas ;-)
But as a follow up (something I have fully investigated now ;-) our
magnesium kit will read total hardness if the calcium precipitation
step is skipped, with the difference giving you a calcium reading.
However, as that kit exists right now (targeted at the saltwater
hobbyist) it would mainly be useful only for measuring total hardness
as the resolution is rather low (for freshwater, not for saltwater)
at around 50 mg/L per drop of titrant.
Gregory Morin, Ph.D. ~~~~~~~Research Director~~~~~~~~~~~~~~
Seachem Laboratories, Inc. www.seachem.com 888-SEACHEM