41. In May 1928, eleven tons of phosgene escaped from a war surplus store in central Hamburg. 42. There are several fluorometric reagents for phosgene , and it can also be quantified with mass spectrometry. 43. BLISTER AGENTS : There are three agents categorized as blister agents : mustard, Lewisite and phosgene oxime. 44. -- June 1918 : First U . S . use of phosgene and other gases in warfare. 45. Britain used a range of poison gases, originally chlorine and later phosgene , diphosgene and mustard gas. 46. The death of a worker from exposure to phosgene also prompted a search for a safer production process. 47. Thus, reaction of ( 1 ) with phosgene gives the reactive the isatoic anhydride ( 2 ). 48. To suppress the formation of ureas excessive phosgene is used ( in a 3 : 1 ratio ). 49. Phosgene was a nerve gas used during World War I and is now used as a commercial feeder chemical.50. Chlorine, phosgene , and hydrogen cyanide are examples, all noxious if inhaled but limited in killing power.
