I-ion selective electrode iyinzwa ye-electrochemical amandla ayo ahambisana ne-logarithm yomsebenzi we-ion kusixazululo esinikeziwe. Iwuhlobo lwenzwa ye-electrochemical esebenzisa amandla olwelwesi ukuze anqume umsebenzi we-ion noma ukugxila esixazululweni. Iyingxenye ye-membrane electrode,kabani Ingxenye eyinhloko yi-membrane yezinzwa ye-electrode. Indlela ye-ion ekhethiwe ye-electrode igatsha lokuhlaziywa kwe-potentiometric. Ngokuvamile isetshenziswa ngendlela eqondile ye-potentiometric kanye ne-titration ye-potentiometric. Imodeli yokusetshenziswa ifakwe ku wawo wIde yohlelo lokusebenza. Ngaphezu kwalokho, it ingakala ukuhlushwa kwama-ion athile esixazululweni. Ngaphezu kwalokho, it ayithinteki yi iumbala futhi imfucumfucu nezinye izici ze i-reagent.
Inqubo yokulinganisa ye-electrode ekhethiwe ye-ion
Lapho ama-ion akalwayo kusixazululo se-electrode ethintana ne-electrode, ukufuduka kwe-ion kwenzeka ku-aquifer ye-ion selective electrode membrane matrix. Kukhona amandla ekushintsheni kwe-charge yama-ion afudukayo, okushintsha amandla phakathi kwezindawo zolwelwesi. Ngakho-ke, umehluko ongaba khona ukhiqizwa phakathi kwe-electrode yokulinganisa kanye ne-electrode yereferensi. Kuhle ukuthi umehluko ongaba khona okhiqizwayo phakathi kwe-electrode ekhethiwe ye-ion nama-ion azokalwa esixazululweni kufanele uhambisane nezibalo ze-Nernst, okuyi-
E=E0+ log10a(x)
E: Amandla alinganiselwe
I-E0: Amandla e-electrode ajwayelekile (njalo)
R: Igesi njalo
T: Izinga lokushisa
Z: I-ionic valence
F: Faraday njalo
a(x): umsebenzi we-ion
Kungabonakala ukuthi amandla e-electrode alinganisiwe alingana ne-logarithm yomsebenzi wama-ion "X". Uma i-coefficient yomsebenzi ihlala ingashintshi, amandla e-electrode nawo alingana ne-logarithm ye-ion concentration (C). Ngale ndlela, umsebenzi noma ukugxila kwe-ion kusixazululo kungatholakala.
Isikhathi sokuthumela: Jan-30-2023