Izindaba - Uyini umehluko phakathi kwe-electrode ye-pH ye-single junction kanye ne-double junction?

Ama-electrode e-PH ahluka ngezindlela ezahlukene; kusukela ekubunjweni kwesihloko, ukuhlangana, izinto zokwakha kanye nokugcwalisa. Umehluko obalulekile ukuthi i-electrode ine-junction eyodwa noma ezimbili.

Ama-electrode e-pH asebenza kanjani?
Ama-electrode e-pH ahlanganisiwe asebenza ngokuba ne-cell engenalutho yokuzwa (intambo yesiliva embozwe yi-AgCl) kanye ne-cell engenalutho yokuzwa (intambo ye-electrode yokuzwa ye-Ag/AgCl), lezi zingxenye ezimbili kumele zihlanganiswe ukuze kuqedwe isekethe ukuze imitha ithole ukufundwa kwe-pH. Ngenkathi i-cell engenalutho yokuzwa izwa ushintsho ku-pH yesisombululo, i-cell engenalutho yokuzwa iyi-reference potential ezinzile. Ama-electrode angagcwaliswa ngoketshezi noma ngejeli. I-electrode ehlanganisiwe yoketshezi idala i-junction enefilimu encane yesisombululo sokugcwalisa esiqongweni se-probe. Ngokuvamile anomsebenzi wephampu wokukuvumela ukuthi udale i-junction entsha kukho konke ukusetshenziswa. Adinga ukugcwalisa kabusha njalo kodwa anikeza ukusebenza okuhle kakhulu okwandisa impilo, ukunemba kanye nesivinini sokuphendula. Uma igcinwa, i-junction yoketshezi izoba nokuphila okuphakade okusebenzayo. Amanye ama-electrode asebenzisa i-electrolyte yejeli engadingi ukugcwaliswa ngumsebenzisi. Lokhu kuwenza abe inketho engenazinkinga kodwa kuzokhawulela impilo ye-electrode cishe unyaka owodwa uma igcinwe kahle.

I-Double Junction – lawa ma-electrode e-pH anebhuloho elengeziwe likasawoti ukuvimbela ukusabela phakathi kwesisombululo sokugcwalisa i-electrode kanye nesampula yakho okungadala umonakalo ekuxhumaneni kwe-electrode. Kudingeka ukuthi ahlole amasampula aqukethe amaprotheni, izinsimbi ezisindayo noma ama-sulfide

I-Single Junction – lokhu kungokwenhloso ejwayelekile yokusetshenziswa kwamasampula angeke avale i-junction.

Uhlobo luni lwe-electrode ye-pH okufanele ngiyisebenzise?
Uma isampula inamaprotheni, ama-sulfite, izinsimbi ezisindayo noma ama-buffer e-TRIS, i-electrolyte ingasabela nesampula futhi yakhe i-solid precipitate evimba ukuhlangana kwe-electrode okunezimbobo futhi kuyimise ukusebenza. Lesi ngesinye sezimbangela ezivame kakhulu ze-"dead electrode" esizibona njalo.

Kulawo masampula udinga i-double junction – lokhu kunikeza isivikelo esengeziwe kulokhu, ukuze uthole impilo engcono kakhulu ye-pH electrode.