Taw qhia rau cov electrodes siv hauv acidometers (ph meters)
Taw qhia rau Electrodes Siv hauv Acidometers (ph Meters)
Acidity meter feem ntau yog los ntawm cov electrode thiab cov kev daws teeb meem los tsim cov microvoltage, yog li cov khoom siv hluav taws xob zoo li cas tseem ceeb heev rau qhov loj ntawm acidity tus nqi. Cov electrodes uas peb nquag siv rau kev ntsuas acidity yog raws li hauv qab no.
(1) Hydrogen electrode: Lub hauv paus ntsiab lus ntawm hydrogen electrode zoo ib yam li cov hlau electrode. Txawm li cas los xij, hydrogen yog ib qho roj thiab tsis tuaj yeem siv ncaj qha raws li electrode. Hloov chaw, platinum electrode coated nrog platinum dub yog xav tau los nqus cov hydrogen los ua cov hlau electrode. Nws qhov txiaj ntsig tseem ceeb yog qhov tseeb thiab tuaj yeem siv los ntsuas pH dav. Txawm li cas los xij, cov electrode no nyob rau hauv cov txheej txheem redox, tiam ntawm lwm yam oxidation los yog txo cov tshuaj, yuav ua rau kev ntsuas yuam kev, kev ua haujlwm tsis yooj yim, yog li no electrode feem ntau tsuas yog siv raws li tus qauv electrode, qhov ntsuas qhov tseeb tsis tshua siv.
(2) Quinone Hydroquinone Electrode: Nws yog inert hlau platinum los yog kub rau hauv quinone hydroquinone saturated tov, thiab yog tsim los ntawm ib tug muaj peev xwm equilibrium tsim los ntawm kev siv quinone hydroquinone ntawm ib tug inert electrode. Qhov zoo ntawm quinone-hydroquinone electrode yog ceev ceev stabilization thiab tsis muaj sab hauv tsis kam. Txawm li cas los xij, yog tias pH siab tshaj 8, hydroquinone, uas yog cov kua qaub tsis muaj zog, pib sib cais lossis oxidise rau hauv quinone, yog li rhuav tshem qhov sib npaug. Tsis tas li ntawd, lwm yam khoom uas tuaj yeem khi nrog quinone yuav cuam tshuam rau kev ntsuas pH, xws li cov proteins, borates, thiab colloidal suspensions.
(3) Antimony electrode: Nws yog ib qho ntawm cov hlau oxide electrodes. Lub electrode ntawm antimony electrode tshwm sim ntawm antimony hlau thiab oxide (tsim los ntawm qhov chaw ntawm antimony nyob rau hauv kev sib cuag nrog huab cua), thiab txij li thaum cov kev ua ntawm no oxide muaj feem xyuam rau cov kev ua ntawm OHˉ nyob rau hauv cov tshuaj, lub peev xwm ntawm antimony electrode yog ncaj qha ntsig txog. mus rau pH tus nqi ntawm cov tshuaj. Qhov zoo ntawm antimony electrode yog nws txoj kev yooj yim ntawm kev ua haujlwm thiab nws cov ruggedness. Txawm li cas los xij, "tus qauv" muaj peev xwm ntawm cov electrode no tsis ruaj khov, thiab muaj lwm cov hlau oxide electrodes uas tuaj yeem siv rau kev ntsuas pH. Muaj lwm cov hlau oxide electrodes uas tuaj yeem siv rau kev ntsuas pH, xws li kev zais cia (Bi) electrode, uas zoo ib yam li hauv paus ntsiab lus thiab cov qauv rau antimony electrode.
(4) Hnub-ib mercury electrode: Cov saturated calomel electrode feem ntau yog siv, uas muaj cov hlau mercury, Hg2CI2 thiab saturated KC1 tov. Nws tsis tsim polarization thiab ruaj khov. Nws cov tshuaj tiv thaiv electrode yog: Hg2CI2+2e= 2 Hg+ 2 C1ˉ.
(5) Iav Electrode: iav pH electrode yog ib qho tseem ceeb tshaj plaws ntawm kev ntsuas pH tam sim no. Thaum nws nkag rau hauv qhov ntsuas ntsuas, hydrogen ionisation ntawm cov ntsuas ntsuas kev sib pauv nrog cov hydrated txheej rau ntawm qhov muag ntawm lub qhov muag teeb, thiab cov txheej sab hauv ntawm lub noob kuj ua rau muaj peev xwm electrode. Txij li thaum hydrogen ionisation nyob rau hauv lub puab txheej tseem nyob tas mus li thaum lub hydrogen ionisation nyob rau hauv txheej txheej hloov, lub peev xwm sib txawv ntawm lub puab thiab txheej txheej kuj hloov, thiab nws loj npaum li cas yog txiav txim los ntawm cov concentration ntawm hydrogen ionisation nyob rau hauv cov tshuaj sab nraum daim nyias nyias. Txoj kev no yooj yim, raug thiab tsis tshua muaj kev cuam tshuam.
(6) Composite electrode: Tam sim no, feem ntau ntawm lawv siv ib hom electrode hu ua composite electrode, piv txwv li iav electrode thiab siv electrode ua ke rau hauv ib qho kev sojntsuam electrode, nrog rau kev sib xyaw ntawm iav electrode thiab siv electrode, ua rau kev ntsuas yooj yim dua, raug thiab txhim khu kev qha.
Acidity meter (ph meter) kev saib xyuas ntawm cov cuab yeej ntxiv rau kev siv qhov ntsuas kom raug ntau dua yuav tsum nkag siab txog kev saib xyuas cov cuab yeej thiab ntsuas kev ceev faj.
