Via the New York Times, this science news:
...Kevin Brown, an Australian businessman with a passion for Beethoven, owned three of the locks and wanted to honor Beethoven’s request in 1802 that when he died doctors might attempt to figure out why he had been so ill. Mr. Brown sent two locks to a specialized lab at the Mayo Clinic that has the equipment and expertise to test for heavy metals.
The result, said Paul Jannetto, the lab director, was stunning. One of Beethoven’s locks had 258 micrograms of lead per gram of hair and the other had 380 micrograms.
A normal level in hair is less than 4 micrograms of lead per gram.
“It definitely shows Beethoven was exposed to high concentrations of lead,” Dr. Jannetto said.
“These are the highest values in hair I’ve ever seen,” he added. “We get samples from around the world and these values are an order of magnitude higher.”
Beethoven’s hair also had arsenic levels 13 times what is normal and mercury levels that were 4 times the normal amount. But the high amounts of lead, in particular, could have caused many of his ailments, Dr. Jannetto said.
The technique used (unsurprisingly) was ICP-MS. (Here's the scientific letter.) It's a shame that a brilliant mind was also poisoned...
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looks like Blogger doesn't work with anonymous comments from Chrome browsers at the moment - works in Microsoft Edge, or from Chrome with a Blogger account - sorry! CJ 3/21/20