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Posted in response to Lead Dangers from John on December 17, 2007 at 10:02:57:

Re: Lead Dangers

The solubility product of lead sulfide is ~2.5 x 10-27, so there is virtually no possibility of you absorbing any lead from galena by skin contact. If you eat the galena, some of it will probably be converted to the chloride in your stomach, and it might be possible to accumulate a dangerous concentration, assuming you pulverized the sample and ingested enough of the powder. You can make ~10 millimolar solutions of lead chloride (perhaps a couple of grams/ 100 mL), but you would have to want to deliberately poison yourself to ingest this quantity of galena.

In short, don't worry about it. (Now handling arsenic minerals, or some of the more powdery radioactives like metaautunite and carnotite - that's a diferent story).

Art

From Dr. Art Friedman - July 04, 2008 at 11:53:03
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Message: 66693

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