Self-calibration thiab cia ntawm pH electrodes
Cov teeb meem yuav tsum xav txog thaum siv lub ntsuas pH (acidity meter) suav nrog: Kev ntseeg siab ntawm electrode yuav tsum tau kuaj xyuas ua ntej siv.
1: Tshawb xyuas seb lub iav qhov muag puas tawg lossis tawg ua ntej siv pH kaw cov electrode. Yog tias tsis yog, nws feem ntau suav tias yog qhov siv tau thaum siv cov tshuaj pH tsis haum rau ob lub ntsiab lus calibration thiab qhov chaw thiab txoj kab nqes cov nyees khawm tuaj yeem hloov mus rau tus nqi pH sib raug. Hloov chaw, txoj kev kho electrode activation tuaj yeem ua tau raws li phau ntawv qhia.
(1) Cov txheej txheem pH electrode ua kom muaj dej ntws hauv 4 feem pua ntawm hydrogen fluoride tov rau li 3 mus rau 5 vib nas this, tshem nws, yaug nws nrog dej huv, thiab tom qab ntawd ntsuas nws hauv 0.1mol / L hydrochloric acid tov. . Siv cov tshuaj tsis haum nrog pH ntawm 6.86 (25 degree) rau qhov chaw, ua lwm yam lus. Tom qab kho txoj kab nqes, xaiv qhov sib txawv pH tsis haum. Lub electrode yuav tsum tau hloov yog tias nws hloov tsis tau.
Cov tshuaj siv sab nraud rau PH uas tsis yog-kaw cov khoom siv hluav taws xob yog 3 mol / L cov tshuaj potassium chloride, yog li nws yuav tsum tau kuaj xyuas seb cov electrode cov tshuaj potassium chloride cov ntsiab lus puas siab dua 1/3. Yog tias tsis yog, 3 mol / L potassium chloride tov yuav tsum tau ntxiv. Yog tias cov tshuaj poov tshuaj chloride nce siab tshaj qhov chaw ntawm lub qhov me me, co tawm cov tshuaj ntxiv kom txog thaum nws nyob hauv qab lub qhov me me, tom qab ntawd tshuaj xyuas cov tshuaj npuas. Yog tias muaj npuas nyob, flick lub electrode kom tshem tawm tag nrho.Yuav kom siv cov electrode, cov roj hmab npog nws yuav tsum tau tev tawm kom pom lub qhov me me. Yog tias tsis yog, lub siab tsis zoo yuav raug tsim thaum lub sij hawm soj ntsuam, tiv thaiv cov tshuaj potassium chloride los ntawm kev hla lub iav qhov muag los pauv ions nrog cov tshuaj ntsuas. yuav ua rau cov ntaub ntawv ntsuas yuam kev. Cov roj hmab yuav tsum tau hloov tom qab ntsuas tiav kom kaw lub qhov me me.
3. Txhawm rau kom lub qhov muag hluav taws xob ntub dej, cov pH electrode yuav tsum tau ntxuav nrog dej distilled thiab ces tsau rau hauv 3 mol / L poov tshuaj chloride tov. Yuav kom tau txais cov electrode mus rau qhov ntsuas zoo tshaj plaws, cia nws zaum hauv cov tshuaj rau ob peb teev. Hauv kev xyaum, nws tau pom tias qee cov kws tshuaj ntsuam xyuas cov khoom siv electrode zoo li iav electrode thiab muab nws da dej ntev hauv dej distilled. Qhov no tsis yog vim nws yuav txo qis cov tshuaj potassium chloride hauv cov khoom siv hluav taws xob sib xyaw, uas yuav ua rau cov khoom siv hluav taws xob tsis zoo yuav tsum tsis txhob tso rau hauv dej distilled rau lub sijhawm ntev txij li cov tshuaj tiv thaiv electrode tsis rhiab thaum ntsuas, uas thaum kawg yuav ua rau cov ntaub ntawv ntsuas tsis raug.
