A number of people had good comments about perchloric acid. GFS does have knowledgeable people and they sell a "fume eradicator" for 250 and 500 ml flasks. Buchi of Germany sells a scrubber as a Kjelahl apparatus accessory. One item of very nice news is that GFS also issued a revision to the Schilt classic on the subject, Perchloric Acid and Perchlorates in 2003. Amazon does not offer the latest edition. GFS sells it as Cat. No. 496 for $95 each.
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