|MadSci Network: Chemistry|
Sorry, I can only give you an educated guess. This sounds like the trade name for a mix of an indicator and Versene (TM), which is EDTA. I would suggest titrating for calcium with Calmagite (1-[1-hydroxy-4- methyl-2-phenylazo]-2-naphthol-4-sulfonic acid) with the addition of EDTA. I don't have any methods handy just now, but you may be able to search under the CAS numbers for the free acid [3147-14-6] and the triethanolammonium salt [91698-30-5] and come up with an appropriate method. If you're looking at water samples, you might want to check the Hach Company catalog, http://www.hach.com
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