Ion selective electrode ndi sensa ya electrochemical yomwe kuthekera kwake kumakhala kofanana ndi logarithm ya zochita za ion munjira yoperekedwa. Ndi mtundu wa sensa ya electrochemical yomwe imagwiritsa ntchito nembanemba kuti izindikire zochitika za ion kapena ndende mu yankho. Ndi ya membrane electrode,amene chigawo chapakati ndi nembanemba yomvera ya electrode. Njira ya ion yosankha ma elekitirodi ndi nthambi ya kusanthula kwa potentiometric. Nthawi zambiri amagwiritsidwa ntchito mwachindunji potentiometric njira ndi potentiometric titration. Chitsanzo chothandizira chimayikidwa mu zake wide application range. Komanso, it akhoza kuyeza ndende ya ayoni enieni mu yankho. Komanso, it sichikhudzidwa ndi ndimtundu ndi chipwirikiti ndi zinthu zina za reagent.
Njira yoyezera ma elekitirodi osankhidwa a ion
Ma ion oyezedwa mu njira ya elekitirodi akalumikizana ndi elekitirodi, kusamuka kwa ayoni kumachitika mumadzi amadzi a ion selective electrode membrane masanjidwewo. Pali kuthekera kwa kusintha kwamphamvu kwa ayoni osamukira, komwe kumasintha kuthekera pakati pa nembanemba. Chifukwa chake, kusiyana komwe kungathe kuchitika kumapangidwa pakati pa electrode yoyezera ndi electrode yolumikizira. Ndikoyenera kuti kusiyana komwe kungapezeke pakati pa ma electrode osankhidwa a ion ndi ma ion oti ayezedwe mu yankho kuyenera kutsatizana ndi Nernst equation, yomwe ndi
E=E0+ chipika10a(x)
E: Kuthekera koyezedwa
E0: Mphamvu zama elekitirodi (nthawi zonse)
R: Nthawi zonse gasi
T: Kutentha
Z: Ionic valence
F: Faraday nthawi zonse
a(x): ntchito ya ion
Zitha kuwoneka kuti mphamvu yoyezera ma elekitirodi ndi yolingana ndi logarithm ya ntchito ya ayoni "X". Pamene coefficient ya ntchitoyo imakhala yosasinthasintha, mphamvu ya electrode imakhalanso yofanana ndi logarithm ya ion concentration (C). Mwanjira iyi, ntchito kapena kuchuluka kwa ayoni mu yankho zitha kupezeka.
Nthawi yotumiza: Jan-30-2023