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Home » WEF Discussion Forums » Laboratory Management & Technical Issues » Calcium Chloride, anhydrous


Calcium Chloride, anhydrousExpand / Collapse
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keith chapman
Posted 4/25/2008 2:33:08 PM
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Last Login: 9/4/2008 7:08:49 PM
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We use anhydrous Calcium Chloride, CaCl2, to make one of the BOD dilution water nutrient solutions.  We have used Fisher C77-500 dessicant grade for quite a few years with no problems...UNTIL we started using a new lot (Fisher Lot# 074872) and found that the solution turned brown (tea colored) within an hour or less and formed a dark precipitate within a day. 

Anyone else having a similar experience?  We are looking for a new source of CaCl2.

Thanks, Keith

Post #8991
Dedalus
Posted 4/26/2008 3:10:59 PM
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Sounds like iron in the ferric form. It wouldn't interfere with use as a dessicant.

I'll bet you'd get fine results using calcium chloride, dihydrate, from the hardware store.

 

Post #8998
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