Iindaba - Yintoni umahluko phakathi kwe-electrode ye-pH ye-single junction kunye ne-double junction?

Ii-electrode ze-PH zahlukile ngeendlela ezahlukeneyo; ukusuka kwimilo yencam, i-junction, izinto kunye nokuzaliswa. Umahluko ophambili kukuba ingaba i-electrode ine-junction enye okanye ezimbini.

Zisebenza njani ii-electrode ze-pH?
Ii-electrode ze-pH ezidityanisiweyo zisebenza ngokuba ne-half-cell yokuva (i-AgCl wire egqunywe yisilivere) kunye ne-half-cell yokuva (i-Ag/AgCl reference electrode wire), ezi zinto zimbini kufuneka zidityaniswe ukuze kugqitywe isekethe ukuze imitha ifumane ukufundwa kwe-pH. Ngelixa i-half cell yokuva iva utshintsho kwi-pH yesisombululo, i-half cell yokuva i-reference potential ezinzileyo. Ii-electrode zingazaliswa ngamanzi okanye ngejeli. I-electrode yokuvalela ulwelo yenza i-junction enefilimu encinci yesisombululo sokuzalisa kwincam yeprobe. Zihlala zinomsebenzi wokupompoza ukuvumela ukuba wenze i-junction entsha kuyo yonke into oyisebenzisayo. Zifuna ukuzaliswa rhoqo kodwa zibonelela ngokusebenza okungcono okwandisa ubomi, ukuchaneka kunye nesantya sokuphendula. Ukuba igcinwe i-liquid junction iya kuba nobomi obusebenzayo obungapheliyo. Ezinye ii-electrode zisebenzisa i-gel electrolyte engadingi kugcwaliswa ngumsebenzisi. Oku kuzenza zibe lukhetho olungenangxaki kodwa kuya kunciphisa ubomi be-electrode ukuya kuthi ga kunyaka omnye ukuba zigcinwe ngokuchanekileyo.

I-Double Junction – ezi electrodes ze-pH zinebhulorho yetyuwa eyongezelelweyo ukuthintela ukusabela phakathi kwesisombululo sokuzalisa i-electrode kunye nesampuli yakho ebeya kubangela umonakalo kwi-electrode junction. Kufuneka zivavanye iisampulu ezineeproteni, iimetali ezinzima okanye iisulfide

I-Single Junction – ezi zenzelwe ukusetyenziswa ngokubanzi kweesampuli ezingayi kuvala i-junction.

Luhlobo luni lwe-electrode ye-pH endifanele ndiyisebenzise?
Ukuba isampuli ineeproteni, iisulphites, iimetal ezinzima okanye ii-TRIS buffers, i-electrolyte inokusabela nesampuli ize yenze i-solid precipitate evala i-porous junction ye-electrode ize iyiyeke isebenze. Le yenye yezona zizathu zixhaphakileyo ze-"dead electrode" esizibona amaxesha amaninzi.

Kwezo sampuli udinga i-double junction - oku kunika ukhuseleko olongezelelweyo koku, ukuze ufumane ubomi obungcono kakhulu kwi-pH electrode.