Iindaba - Ziziphi iindlela eziphambili zokulinganisa i-oksijini enyibilikisiweyo emanzini?

Umxholo weoksijini enyibilikisiweyo (DO) luphawu olubalulekileyo lokuvavanya amandla okuzihlambulula kweendawo zasemanzini kunye nokuvavanya umgangatho wamanzi uphela. Uxinzelelo lweoksijini enyibilikisiweyo luchaphazela ngokuthe ngqo ukwakheka kunye nokusasazeka kweendawo eziphilayo zasemanzini. Kwiintlobo ezininzi zeentlanzi, amanqanaba e-DO kufuneka adlule kwi-4 mg/L ukuxhasa imisebenzi eqhelekileyo yomzimba. Ngenxa yoko, ioksijini enyibilikisiweyo luphawu oluphambili lwesiqhelo.iinkqubo zokujonga umgangatho wamanzi.Iindlela eziphambili zokulinganisa ioksijini enyibilikisiweyo emanzini ziquka indlela ye-iodometric, indlela ye-electrochemical probe, indlela ye-conductivity, kunye nendlela ye-fluorescence. Phakathi kwezi, indlela ye-iodometric yayiyindlela yokuqala emiselweyo eyenzelwe ukulinganisa i-DO kwaye ihlala iyindlela yesalathiso (ibhentshi). Nangona kunjalo, le ndlela ichaphazeleka kakhulu kukuphazamiseka okubangelwa zizinto ezincitshiswayo ezifana ne-nitrite, i-sulfides, i-thiourea, i-humic acid, kunye ne-tannic acid. Kwiimeko ezinjalo, indlela ye-electrochemical probe iyacetyiswa ngenxa yokuchaneka kwayo okuphezulu, ukuphazamiseka okuncinci, ukusebenza okuzinzileyo, kunye nokukwazi kwayo ukulinganisa ngokukhawuleza, okwenza ukuba yamkelwe ngokubanzi kwizicelo ezisebenzayo.

Isivamvo sokuqhuba amanzi enkunkuma yemizi-mveliso

Indlela ye-electrochemical probe isebenza ngomgaqo wokuba iimolekyuli ze-oksijini zisasazeke nge-membrane ekhethiweyo kwaye zincitshiswe kwi-electrode esebenzayo, nto leyo evelisa umsinga wokusasaza ohambelana noxinzelelo lwe-oksijini. Ngokulinganisa lo msinga, uxinzelelo lwe-oksijini enyibilikisiweyo kwisampuli lunokuqinisekiswa ngokuchanekileyo. Eli phepha ligxile kwiinkqubo zokusebenza kunye neendlela zokugcina ezinxulumene nendlela ye-electrochemical probe, ejolise ekuphuculeni ukuqonda iimpawu zokusebenza kwesixhobo kunye nokuphucula ukuchaneka kokulinganisa.

1. Izixhobo kunye neeReagents
Izixhobo eziphambili: i-analyzer yomgangatho wamanzi esebenza ngeendlela ezininzi
Ii-reagents: ezo zifunekayo ekumiselweni kwe-iodometric ye-oxygen enyibilikisiweyo

2. Ukulinganisa Okupheleleyo kweMitha yeOksijini enyibilikisiweyo
Indlela yeLebhu 1 (Indlela yoMoya oQokelelweyo kunye naManzi): Kwiqondo lobushushu elilawulwayo legumbi elingama-20 °C, faka i-1 L yamanzi acocekileyo kakhulu kwi-beaker ye-2 L. Faka umoya rhoqo kwisisombululo kangangeeyure ezi-2, uze uyeke umoya kwaye uvumele amanzi azinze imizuzu engama-30. Qalisa ukulinganisa ngokubeka i-probe emanzini uze uvuselele nge-magnetic stirrer kwi-500 rpm okanye uhambise i-electrode kancinci ngaphakathi kwesigaba samanzi. Khetha "ukulinganisa umoya-manzi ogcweleyo" kwi-interface yesixhobo. Xa ugqibile, ukufundwa kwesikali esipheleleyo kufuneka kubonise i-100%.

Indlela yeLebhu yesi-2 (Indlela yoMoya ogcwele ngamanzi): Kwi-20 °C, manzisa isiponji ngaphakathi kwesingxobo sokukhusela seprobe ide igcwale ngokupheleleyo. Cima ngononophelo umphezulu we-membrane ye-electrode ngephepha lesihluzo ukuze ususe umswakama ogqithisileyo, phinda ufake i-electrode kwisingxobo, kwaye uyivumele ilingane iiyure ezi-2 ngaphambi kokuba uqalise ukulinganisa. Khetha "ukulinganisa umoya ogcwele amanzi" kwi-interface yesixhobo. Emva kokugqiba, ukufundwa kwesikali esipheleleyo kudla ngokufikelela kwi-102.3%. Ngokubanzi, iziphumo ezifunyenwe ngendlela yomoya ogcwele amanzi ziyahambelana nezo zivela kwindlela yomoya ogcwele amanzi. Ukulinganisa okulandelayo kweyiphi na indlela ephakathi kudla ngokuvelisa amaxabiso amalunga ne-9.0 mg/L.

Ukulinganisa Intsimi: Esi sixhobo kufuneka silinganiswe ngaphambi kokusetyenziswa ngakunye. Ngenxa yokuba amaqondo obushushu angaphandle ahlala ehluka kwi-20 °C, ukulinganisa intsimi kungcono kwenziwe kusetyenziswa indlela yomoya ogcwele amanzi ngaphakathi kwesingxobo seprobe. Izixhobo ezilinganiswe kusetyenziswa le ndlela zibonisa iimpazamo zokulinganisa ngaphakathi kwemida eyamkelekileyo kwaye zihlala zifanelekile ukusetyenziswa kwintsimi.

3. Ukulinganisa iingongoma zeZero
Lungisa isisombululo esingenaoksijini ngokunyibilikisa i-0.25 g ye-sodium sulfite (Na₂SO₃) kunye ne-0.25 g ye-cobalt(II) chloride hexahydrate (CoCl₂·6H₂O) kwi-250 mL yamanzi acocekileyo kakhulu. Faka i-probe kwesi sisombululo uze ushukumise kancinci. Qalisa ukulinganisa i-zero-point kwaye ulinde ukuba ukufundwa kuzinze ngaphambi kokuqinisekisa ukugqitywa. Izixhobo ezixhotyiswe nge-automatic zero compensation azifuni ukulinganisa i-zero ngesandla.

Bhala umyalezo wakho apha uze uwuthumele kuthi

Ixesha leposi: Disemba-09-2025