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Degradation of Adsorbed Sarin on Activated Carbons: A 31 P‐MAS‐NMR Study
Author(s) -
Kaplan Doron,
Shmueli Liora,
Nir Ido,
Waysbort Daniel,
Columbus Ishay
Publication year - 2007
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.200600008
Subject(s) - chemistry , magic angle spinning , adsorption , sarin , activated carbon , isopropyl , carbonization , nuclear magnetic resonance spectroscopy , nuclear chemistry , organic chemistry , acetylcholinesterase , enzyme
The fate of the OP nerve agent isopropyl methylphosphonofluoridate (sarin) on granular activated and metal‐impregnated activated carbons that are used in gas‐mask filters was investigated by means of 31 P magic‐angle‐spinning (MAS) NMR spectroscopy. The results show that most of the adsorbed sarin on extensively dried carbons decomposes with a half‐life of 5–12 days. A MAS‐NMR signal of the degradation product isopropyl methylphosphonic acid (IMPA) appears in the spectra of sarin on non‐impregnated carbons. The IMPA signal is not visible in the spectra from metal‐impregnated carbons, probably due to strong binding of the acid molecule to paramagnetic Cr 3+ and Cu 2+ ions. Exposure of BPL and ASC carbons to air of 53% relative humidity shortens the degradation time by approximately an order of magnitude. Wetting shortens the half‐life of sarin on BPL carbon to approximately 2 hours.