Dab tsi yuav tsum tau ceev faj thaum siv lub ntsuas oxygen yaj hauv lub neej txhua hnub?
1. Kev tu txhua hnub ntawm cov twj paj nruag feem ntau suav nrog kev tu txhua hnub, calibration, thiab rov tsim cov electrodes.
(1) Cov electrodes yuav tsum tau ntxuav ib zaug txhua 1-2 lub lis piam. Yog tias muaj cov pa phem rau ntawm daim nyias nyias, nws tuaj yeem ua rau kev ntsuas yuam kev. Ceev faj tsis txhob ua kom lub diaphragm puas thaum ntxuav. Yaug cov electrode hauv dej huv. Yog tias cov av tsis tuaj yeem raug tshem tawm, ua tib zoo so nrog cov ntaub mos muag lossis paj rwb.
(2) Zero point thiab ntau yam yuav tsum tau kuaj xyuas txij Lub Ob Hlis mus txog Lub Peb Hlis.
(3) Kev tsim dua tshiab ntawm electrodes yog nqa tawm kwv yees li ib xyoos ib zaug. Thaum qhov ntsuas qhov ntsuas tsis tuaj yeem hloov kho, nws yog ib qho tsim nyog yuav tsum rov tsim dua cov pa oxygen electrode. Electrode regeneration muaj xws li hloov cov electrolyte sab hauv, hloov daim nyias nyias, thiab ntxuav cov nyiaj electrode. Yog tias muaj oxidation pom ntawm cov nyiaj electrode, nws tuaj yeem polished nrog cov ntawv xuab zeb zoo.
(4) Yog tias electrode to pom thaum siv, cov electrolyte yuav tsum tau hloov.
2. Txoj kev calibration rau cov twj paj nruag feem ntau siv tau cov qauv ua kua calibration lossis nyob rau ntawm qhov chaw calibration.
(1) Standard solution calibration method: Standard solution calibration feem ntau siv ob-point calibration, namely xoom calibration thiab ntau calibration. Cov tshuaj calibration xoom tuaj yeem yog 2% Na2SO3 tov. Cov tshuaj calibration ntau tuaj yeem xaiv tau raws li 4M KCl tov (2mg / L) raws li qhov ntsuas ntsuas ntau yam; 50% tshuaj methanol (21.9mg / L).
(2) Ntawm qhov chaw sampling calibration method (Winkler method): Hauv kev siv tswv yim, Winkler txoj kev feem ntau yog siv rau ntawm qhov chaw calibration ntawm yaj oxygen analyzers. Muaj ob qhov xwm txheej thaum siv cov qauv no: thaum ntsuas ntsuas ntsuas ntsuas yog M1, qhov ntsuas ntsuas tus nqi yog A, thiab thaum ntsuas ntsuas ntsuas ntsuas ntsuas ntsuas tseem yog M1. Lub sijhawm no, tsuas yog kho qhov ntsuas ntsuas kom sib npaug A; Thaum ua piv txwv, qhov ntsuas ntsuas yog M1, thiab qhov ntsuas ntsuas tus nqi yog A. Thaum ntsuas qhov ntsuas, ntsuas ntsuas ntsuas hloov mus rau M2. Lub sijhawm no, qhov ntsuas ntsuas ntsuas tsis tuaj yeem sib npaug rau A, tab sis yuav tsum tau hloov kho rau 1MA x M2. 3. Kev ceev faj thaum siv: Vim yog lub teeb liab siab impedance ntawm cov pa oxygen electrode yaj (txog 20M Ω), qhov siab tshaj plaws ntawm cov yaj oxygen electrode thiab lub converter yog 50m; Lub yaj oxygen electrode tseem yuav tsum nyob hauv kev ua haujlwm thaum tsis siv thiab tuaj yeem txuas nrog lub tshuab hloov pauv oxygen yaj. Cov hluav taws xob uas tau tso tseg ntev los yog rov tsim dua tshiab (los ntawm kev hloov cov electrolyte los yog daim nyias nyias) yuav tsum tau polarized nyob rau hauv ib puag ncig anaerobic rau 1-2 teev ua ntej siv; Vim qhov cuam tshuam tseem ceeb ntawm kev hloov pauv ntawm qhov kub thiab txias ntawm diffusion thiab oxygen solubility ntawm electrode zaj duab xis, calibration yuav tsum tau siv sij hawm ntev (kwv yees li 10 feeb) kom ua tiav qhov sib npaug ntawm qhov kub thiab txias; Cov pa oxygen ib feem ntawm lub siab muaj feem xyuam rau qhov siab ntawm thaj av, thiab cov cuab yeej yuav tsum tau them nyiaj raws li lub hauv paus atmospheric siab ua ntej siv; Thaum ntsuas cov ntsiab lus ntsev siab ntawm cov tshuaj, cov tshuaj uas muaj cov ntsiab lus ntsev sib npaug yuav tsum tau siv rau kev ntsuas ntsuas; Rau cov kev ntsuas ntws, qhov tsawg kawg nkaus tus nqi ntawm cov electrode yuav tsum yog 0.3m / s.
