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    Çevre numunelerindeki potasyumun akış enjeksiyon analiz yöntemi ile iyon seçici elektrot kullanarak potansiyometrik tayini
    (Batman Üniversitesi, 2020-12-31) Asan, Adem
    In this study, K+-selective potentiometric PVC-membrane electrode was developed with the commercially purchased ionophore substance to be used to determine potassium concentration in water samples. The potentiometric performance characteristics of the electrode were determined and their suitability for environmental analysis was investigated. For the measurements taken with the K+-selective electrode, a potential difference of 50,2±1,4 mV was observed for each 10 fold concentration change against the main ion solution. The electrode showed linear behavior against the main ion solution in the concentration range of 1x10-5-1x10-1 mol L-1, and it was found to be highly selective against the main ion besides the alkali and alkaline earth metal ions. Micro dead volume flow cells were prepared in the laboratory and the sodium determination was made in environmental water samples by using these electrodes developed as a detector in the flow injection analysis (FIA) system (as the mobile phase 5x10-5 M CaSO4 and MgSO4; 1x10-6 M NaCl, KNO3, LiNO3 and NH4Cl solution mixture, flow rate: 1,0 mL min-1 and injection volume 20 μL). In addition, potassium determination in water samples was done by standard addition method and all measurements were compared with potentiometric results. The results show that the K+-selective micro-potentiometric PVC-membrane electrode can effectively be used for routine determination of potassium ion in water in environmental samples.