y means of FTIR

elemental analysis

X--ray diffraction

SEM and other analytical methods

the redox mechanism of amidoxime chelate polyvinyl-- formal nonwoven fabric (Ac-- PVFF ) recating with An3+ was investigated and some valuable ideas were propose in mis paper. It can be proposed from experimental resuits that when An-- PVFF reacts with Ans+

almost amidoxime groups are oxidized to amide groups

while some are oxidized to carboxyl groups

At the same bine

the small molecular weight nitrogen--containing compounds released from the redox process are found to be mainly nitrogen oxide (NOx). As well as

H+ ion is produced in the redox process. Au3+ ions are finally reduced into ele-mental gold in redox process although some of them may be chelated by Ao-PVFF in the beggining at lower temperature. The produced gold crystallizes on Ao-PVFF in the rose-shaped and the mount of crystallite increase with the lengthning of redox duration.