a novel silver (ag) nanocomposite electrode was proposed that fabricated from metal nanostructures and ionic liquids. the combined application of unique properties of nanomaterials and ionic liquids in the design of this ag nanocomposite results in electrodes with interesting advantages compared to the conventional metal disk electrode. in the first part of this thesis, the elecrocatalytic effect of ag paste nanocomposite electrode toward the oxidation of hydroxylamine in alkaline media was investigated. hydroxylamine was detected over a linear concentration range of 1µm- 5mm with double potential step chronoamperometry. the limit of detection was obtained as 0.30 µm. this new method of hydroxylamine determination is reproducible, selective, and sensitive, and can be used for real sample analysis. the independency of the system from most of the interferences and its ability of easily removing the effect of most cationic interferences are the important features of this work. in the second part, the ag paste nanocomposite electrode was employed as an efficient electrocatalyst for semicarbazide oxidation in alkalin media. the results confirm that this nanocomposite electrode has high sensivity, low detection limit (0.6 µm), wide linear range (1.3 µm-0.5 mm and 0.5 mm- 2.3 mm), good long term stability and reproducibility for determination of semicarbazide. moreover, the electrode surface can be cleaned and renewed very easily by polishing on the smooth paper. therefore, this proposed electrode can have many applications as electrochemical sensors.