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#1
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Here's a more thorough lead leaching test of monochrome and color CRTs
http://www.pca.state.mn.us/index.php....html?gid=4865 The second table seems to show that it's not the thick, heavy face that's the source of lead leaching out, it's the neck and especially the funnel. Here's an excerpt from the conclusion: Quote:
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#2
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Quote:
The report itself admits that the Toxicity Characteristic Leaching Procedure (TCLP) is not without controversy. I do not accept the premise that the process represents conditions found in the typical municipal landfill. The procedure breaks the CRT into a 9.5mm size that I find reasonable... But then these pieces are "rotated at 30 rpm for 18 ( 2 h in a 12 vessel rotary extractor. The extract was filtered through a glass fiber filter of 0.8-ím pore size and the sample preserved using 2 mL of nitric acid per 500 mL of sample." Now you are breaking the glass nearly into its basic silica components. Remember, the 9.5mm size is just a maximum size... There are already many sand-like bits created by using a hammer to break down the crt, per the study's methodology. That 18 hour "rock tumbling" is not something I would expect to see occur in a landfill... At least not in a time frame where naturally-occurring lead might migrate through the same soil. Then they are using an acid to "digest" this mix into a sample that can be passed through flame spectrophotometer. Quote:
I am not alone in finding fault with this methodology. Below I began selecting relevant text from a 1999 letter sent to the EPA critical of the text methodology, and I've left it if anyone wants to read it. But in summary it sounds like whoever conducted the study used a method that would basically separate the silica from the lead and give the expected result. Consider that there is money to be made (and government bureaucracies to be propped-up) in re-classifying CRTs as hazardous waste. Funny how water sits inside lead pipes in municipal water systems, yet there is no "push" to replace these systems. Maybe the lobby group and the money just haven't arrived yet for that cause, but does that make it more or less of a risk to health? Quote:
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From Captain Video, 1/4/2007 "It seems that Italian people are very prone to preserve antique stuff." Last edited by Carmine; 01-27-2015 at 05:59 AM. |
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