Calcium Chloride, anhydrous

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Calcium Chloride, anhydrous

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keith chapman

Posted 4/25/2008 2:33:08 PM

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Last Login: 7/7/2008 5:43:25 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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Last Login: 7/12/2008 12:23:13 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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