Here's my take on it, for whatever it's worth:
http://regnumcrucis.blogspot.com/2004_04_25_regnumcrucis_archive.html#108301312374985786 From the looks of things, the sulfuric acid is the blister agent in question being referred to, but that still doesn't identify the nerve agent that was also allegedly involved here. Reuters sez that Jayyousi is an Afghan alumni who worked for Zarqawi back in the good old days in Afghanistan and worked with him again in Iraq to plot the overthrow of the Hashemites. My guess is that Jayyousi and the other Jordanians in on the plot are probably either members of Zarqawi's Bani Hassan tribe or else Jordanian Palestinians who hate their generally sane and pro-American Hashemite monarchy.
The most ominous thing is that Jayyousi and another Zarqawi lieutenant set up a plant near the Syrian border to produce all of these chemicals according to the Reuters account. Fortunately, the city where the plant was located, Irbid, is in Jordanian territory and hence has probably already been taken down.
Well for whatever it is worth (probably not much) I have suggested that the nerve agent might be some form of insecticide.