Kev siv pH Meters hauv av Acidity-Alkalinity Measurement
Summary of pH Measurement Methods
Kev txiav txim siab ntawm cov av pH siv txoj kev potentiometric suav nrog kev ntxig pH iav electrodes thiab calomel electrodes rau hauv av tshem tawm los yog leachate, ntsuas lawv cov nqi hluav taws xob electromotive, thiab tom qab ntawd hloov mus rau pH qhov tseem ceeb (acidity lossis alkalinity). Tus nqi pH tuaj yeem nyeem ncaj qha tom qab txiav txim siab los ntawm cov txheej txheem kev daws teeb meem ntawm cov ntsuas acidity. Cov av sib piv ntawm cov av muaj qhov cuam tshuam loj rau pH tus nqi, tshwj xeeb tshaj yog rau cov nyhuv dilution ntawm calcareous av. Nws yog ib qho tsim nyog yuav tau txais ib qho av me me thiab teeb tsa cov av pH ntawm 1: 1. Nyob rau tib lub sijhawm, ntxiv rau kev ntsuas pH tus nqi ntawm cov av ntub dej, pH tus nqi ntawm ntsev soaked av yuav tsum tau ntsuas rau acidic av, uas yog, cov av H + yuav tsum tau leached nrog 1mol / L poov tshuaj chloride tov thiab ntsuas los ntawm potentiometry.
PH meter ntsuas reagent
① 1mol/L potassium chloride tov: Nyhav 74.6 ɡ potassium chloride (tshuaj lom neeg) thiab yaj hauv 800ml dej. Kho cov batch pH ntawm kev daws rau 5.5-6.0 nrog dilute potassium hydroxide thiab dilute hydrochloric acid, thiab dilute mus rau 1L;
② PH 4.01 (25 degree) txheem buffer tov: Nyhav 10.21 potassium hydrogen phthalate, uas tau qhuav ntawm 110-120℃rau 2-3 teev, thiab
dissolve nws nyob rau hauv dej. Hloov nws mus rau hauv 1L volumetric hwj, dilute nrog dej, thiab muab cia rau hauv ib lub hwj polyethylene;
③ Ph6.87 (25 degree) standard buffer solution: Nyhav 3.533g ntawm disodium hydrogen phosphate thiab 3.388g ntawm poov tshuaj dihydrogen phosphate, uas tau qhuav ntawm 110-130℃rau 2-3 teev, thiab yaj lawv nyob rau hauv dej. Hloov lawv mus rau hauv 1L volumetric hwj, ua kom ntim nrog dej, thiab muab cia rau hauv lub hwj polyethylene;
④ Ph9.18 (25 degree) standard buffer solution: Nyhav 3.800g ntawm borax (Na2B4O7 · 10H2O) uas tau sib npaug thiab yaj hauv CO2 dawb dej. Hloov nws mus rau hauv 1L volumetric hwj, ua kom ntim nrog dej, thiab khaws cia rau hauv lub hwj polyethylene;
