0 and 55℃. Under optimum conditions, beta-CD-osmium (IV)-KBrO3-OVFH supramolecular kinetic catalytic reaction system had excitation and emission maxima at 337 and 490 nm, respectively. The linear range of this method was 0-120ng/ml−1 with a R.S.D. of 1.1%, and the detection limit was 0.38ng/ml−1. The effect of interferences was studied. Distillation was used to separate osmium from interfering elements in the samples. The proposed method was applied successfully to determine osmium(IV) in synthetic mixture and mineral samples, the results were well consistent with the reference standard values.

Solvothermal synthesis of La (OH)3 sol and microwave radiation drying of La (OH)3 nanorods were employed for the first time to synthesize La2O3 nanorods with diameters around 10nm and lengths up to 200nm. The resulting products were characterized with XRD, TEM and HRTEM. Microwave radiation drying was found to be more effective to maintain the morphologies of nanorods than conventional drying.

The supramolecular interaction of gemfibrozil and β-cyclodextrin has been studied by flow injection spectrofluorimetry. The results show that β-CD reacts with gemfibrozil to form a 1:1 complex with an apparent association constant of 7.57×102 L/mol. Based on the enhancement of the fluorescence intensity of gemfibrozil, a flow injection spectrofluorimetric method for the determination of gemfibrozil in bulk aqueous solution in the presence of β-CD was developed. The linear range was 0.032-70.00g/mL. The detection limit was 9.6ng/mL with a sampling rate of 80h−1. There was no interference from the excipients normally used in tablet formulations and the serum compositions. The proposed method was successfully applied to the determination of gemfibrozil in capsules and serum.

The supramolecular interaction of dequalinium chloride (DQC) and -cyclodextrin has been studied by flow injection spectrofluorimetry. The results showed that -CD reacted with DQC to form a 1:1 host:guest complex with an apparent association constant of 4.99×102Lmol−1. Based on the enhancement of the fluorescence intensity of DQC, a flow injection sepctrofluoremetric method for the determination of DQC in bulk aqueous solution in the presence of -CD was developed. The linear range was 0.0412-30.00gmL−1. The detection limit was 12.3ngmL−1 with a sampling rate of 80h−1. There was no interference from the excipients normally used in tablets and serum compositions. The proposed method was successfully applied to the determination of DQC in tablets and serum.

A flow injection (FI) kinetic spectrofluorimetric method was developed for the determination of palladium and the possible mechanism of catalytic reaction was discussed. Salicylaldehyde furfuralhydrazone (SAFH) was newly synthesized and its ionization, IR and elemental analysis were established. The methodwas based on the fluorescent enhancing reaction of SAFH with potassium bromate, whichwas catalysed by palladium in water medium at pH 7.30 and 30℃. Under these experimental conditions, the oxidized product of SAFH had excitation and emission wavelengths maxima at 370 and 460nm, respectively. The linear range of this method was 1.0-210ng/ml−1 with the R.S.D. of 1.3% from a series of 11 standards each containing 50ng/ml−1 of palladium. The detection limit was 0.30ng/ml−1 of palladium. A high analysis rate of 24 samples h−1 was obtained by the FI method. Sensitivity and selectivity were increased by a Pd2+preconcentration separation methodology. The proposed method was applied successfully to determine palladium in synthetic mixtures and mineral samples, the common interference ions were separated, and the results were agreeable with the standard values.