The properties and analytical applications of a new type of selective sorbents - fibrous materials filled with completing ion excnahgers - POLYORGS XI-N and Polyarsenazo-n - were considered. This type of sorbents consist of porous hydrophilic fibres containing fine-grained polymeric sorbents (fillers). The sorptive and kinetic properties of these materials were measured. These sorbents are sufficiently selective and exhibit high sorptive capacity and fast kinetics. The sorbent POLYORGS XI-N has been used for preconcentration of noble metals from natural and industrial materials. The analytical determination were performed by atomic absorption spectrometry of a suspension of the filler in N,N-dimethylformamide. The sorbent Polyarsenazo-n was used for preconcentration of uranium and rare earths prior to their determination in waters.