Zeziphi iindlela eziphambili zokulinganisa ioksijini enyibilikileyo emanzini?

Indlela ye-electrochemical probe isebenza kumgaqo wokuba iimolekyuli ze-oksijini zisasazeke nge-membrane ekhethiweyo kwaye ziyancipha kwi-electrode esebenzayo, ivelisa ukusabalalisa ngoku ngokulinganayo kwi-oxygen concentration. Ngokulinganisa le yangoku, i-oxygen concentration ye-oxygen echithwe kwisampulu inokumiselwa ngokuchanekileyo. Eli phepha ligxininise kwiinkqubo zokusebenza kunye nezenzo zokulondoloza ezinxulumene ne-electrochemical probe method, ejolise ekuphuculeni ukuqonda kweempawu zokusebenza kwesixhobo kunye nokuphucula ukuchaneka kokulinganisa.

1.Izixhobo kunye neeReagents
Izixhobo eziphambili: i-multifunctional water quality analyzer
I-Reagents: ezo zifunekayo ekumiselweni kwe-iodometric ye-oxygen echithwe

2. Ulungelelwaniso olupheleleyo lweMeter ye-Oxygen eNcinyiweyo
Indlela yoku-1 yeLabhoratri (iNdlela eGcinisiweyo yoMoya-Amanzi): Kwiqondo lokushisa elilawulwayo legumbi le-20 °C, faka i-1 L yamanzi e-ultrapure kwi-beaker ye-2 L. I-aerate isisombululo ngokuqhubekayo kwiiyure ezi-2, emva koko uyeke ukungena kwaye uvumele amanzi ukuba azinze imizuzu engama-30. Qalisa ukulinganisa ngokubeka i-probe emanzini kwaye uvuselele nge-stirrer magnetic kwi-500 rpm okanye ukuhambisa ngobunono i-electrode ngaphakathi kwesigaba samanzi. Khetha "i-saturated air-water calibration" kwi-interface yesixhobo. Kwakuba kugqityiwe, ufundo olupheleleyo kufuneka lubonise i-100%.

Indlela yesi-2 yeLabhoratri (iNdlela yoMoya oGcweliswe ngaManzi): Kwi-20 °C, manzisa isiponji ngaphakathi komkhono wokukhusela weprobe de ugcwale ngokupheleleyo. Cima ngobunono umphezulu we-membrane ye-electrode ngephepha lokucoca ukususa ukufuma okugqithisileyo, phinda ufake i-electrode kumkhono, kwaye uyivumele ukuba ilingane kwiiyure ezi-2 ngaphambi kokuba uqalise ukulinganisa. Khetha "ukulungelelaniswa komoya ozele ngamanzi" kwi-interface yesixhobo. Ekugqityweni, ufundo olupheleleyo lufikelela kwi-102.3%. Ngokuqhelekileyo, iziphumo ezifunyenwe ngendlela yomoya ozaliswe ngamanzi zihambelana nezo zisuka kwindlela yomoya-amanzi agcweleyo. Imilinganiselo elandelayo nokuba yephakathi inika amaxabiso malunga ne-9.0 mg/L.

Ulungelelwaniso lweNdawo: Isixhobo kufuneka silinganiswe phambi kokusetyenziswa ngakunye. Ngenxa yokuba amaqondo obushushu angaphandle ahlala ephambuka kwi-20 °C, ulungelelwaniso lwasendle lwenziwa ngcono kusetyenziswa indlela yomoya ozele ngamanzi ngaphakathi komkhono weprobe. Izixhobo ezilinganisiweyo zisebenzisa le ndlela zibonisa iimpazamo zokulinganisa kwimida eyamkelekileyo kwaye zihlala zifanelekile kwisicelo sangaphandle.

3. Ulungelelwaniso lweZiro-Point
Lungiselela isisombululo esingenayo i-oksijeni ngokuchithwa kwe-0.25 g ye-sodium sulfite (Na₂SO₃) kunye ne-0.25 g ye-cobalt (II) i-chloride hexahydrate (CoCl₂·6H₂O) kwi-250 mL yamanzi e-ultrapure. Gxininisa i-probe kwesi sisombululo kwaye ngokukhawuleza uphazamise. Qalisa ukulinganisa kwamanqaku e-zero kwaye ulinde ukuba ufundo luzinze ngaphambi kokuqinisekisa ukugqitywa. Izixhobo ezixhotyiswe ngembuyekezo enguziro ezenzekelayo ayifuni ukulinganisa u-zero ngesandla.