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Old 01-21-2007, 06:30 PM  
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The Beryllium Thread

I'm putting this in here so that it won't hang around the top of the lounge while I cut and paste information in to post after post.

This is part of my ongoing offseaon attempt to get us ranked on the first page of some search engine(s) when nerds search for "beryllium".

Before you PM me with "Why?", the answer is simply that I am sitting around reading log files at work and cutting and pasting into this thread requires absolutely NO mental stress.

Last edited by Dartgod; 04-14-2011 at 09:18 PM..
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Old 01-27-2007, 11:25 AM   #1726
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What happens if you add a base?
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Old 01-27-2007, 11:25 AM   #1727
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Adding more hydroxide ions to the neutral complex pulls more hydrogen ions off the water molecules to give the tetrahydroxoberyllate ion:
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Old 01-27-2007, 11:26 AM   #1728
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The beryllium hydroxide dissolves because the neutral complex is converted into an ion which will be sufficiently attracted to water molecules.
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Old 01-27-2007, 11:26 AM   #1729
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Why doesn't this happen with, for example, calcium hydroxide?
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Old 01-27-2007, 11:26 AM   #1730
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Calcium hydroxide is truly ionic - and contains simple hydroxide ions, OH-. These react with hydrogen ions from an acid to form water - and so the hydroxide reacts with acids.
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Old 01-27-2007, 11:27 AM   #1731
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However, there isn't any equivalent to the neutral complex. Adding more hydroxide ions from a base has no effect because they haven't got anything to react with.
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Old 01-27-2007, 11:27 AM   #1732
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Note: This has been simplified to bring it into line with the sort of treatment you will meet for the acid-base behaviour of transition metal hydroxides. In particular, the structure of beryllium hydroxide is probably even more complicated than has been suggested above!
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Old 01-27-2007, 11:27 AM   #1733
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Purpose of the Workplace Study
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Old 01-27-2007, 11:27 AM   #1734
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Before this study began, we knew that people exposed to beryllium may develop two forms of beryllium disease, acute and chronic. These are lung diseases caused by exposure to beryllium. The acute form is a rare pneumonia-like disease that occurs shortly after very high exposures to beryllium. The chronic form may develop many years after being exposed to beryllium. Chronic beryllium disease is described in the fact sheet Steps to Protect Your Health.
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Old 01-27-2007, 11:28 AM   #1735
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Our study, however, focused on lung cancer. Some studies had previously linked lung cancer to beryllium exposure. However, this link was uncertain. Thus, we did our study to further examine this issue.
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Old 01-27-2007, 11:28 AM   #1736
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Description of the Workplace Study
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Old 01-27-2007, 11:28 AM   #1737
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We studied 9,225 workers employed at 7 beryllium processing plants between 1940 and 1969.
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Old 01-27-2007, 11:29 AM   #1738
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We based the study on work records that we got from the companies. We also obtained the death certificates of workers who had died. We counted the number of workers who died from each disease.
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Old 01-27-2007, 11:29 AM   #1739
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Then we calculated the number of deaths from each disease that we would expect to find in the workers, based on how often people die of these diseases in the U.S. population as a whole. If the number of deaths in the workers is higher than the expected number, then workplace exposures may be the cause.
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Old 01-27-2007, 11:29 AM   #1740
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What We Found
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