**4. Conclusion**

PQ+.Cl treated PUFs solid sorbent was successfully used for the pre concentration/separation procedures of bismuth (III) and bismuth (V) after reduction of the latter species to bismuth (III). The developed method minimizes the limitations related to sensitivity and selectivity for bismuth determination in various matrices. The intra-particle diffusion and the first order model of bismuth (III) retention onto the tested PQ+.Cl- PUFs sorbent are confirmed from the kinetic data. PUFs packed column has shown itself to be a very useful and precise for the analysis of total bismuth (ІІІ) & (V) species in water at trace concentrations in water. The PUFs packed column can be reused many times without decrease in its efficiency. Work is continuing for calculating ligation capacity, influence of competitive agents and organic material present in water samples. The LOD of the method is quite close to the concentration of bismuth species reported in marine water. Work is still continuing on developing PQ+.Cl treated PUFs packed column mode for on line determination of bismuth (III) and/ or (V) species at ultra concentrations in aqueous media.

Fast, Selective Removal and Determination of Total Bismuth (III) and (V) in Water by Procaine Hydrochloride Immobilized Polyurethane Foam Packed Column Prior to Inductively Coupled… 305

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