Kodi Njira Zoyambira Zoyezera Mpweya Wosungunuka M'madzi Ndi Ziti?

Njira yofufuzira yamagetsi imagwira ntchito motsatira mfundo yakuti mamolekyu a okosijeni amafalikira kudzera mu nembanemba yosankha ndipo amachepetsedwa pa electrode yogwira ntchito, zomwe zimapangitsa kuti mphamvu yofalitsa ifalikire mofanana ndi kuchuluka kwa okosijeni. Poyesa mphamvu imeneyi, kuchuluka kwa okosijeni komwe kumasungunuka mu chitsanzocho kumatha kudziwika bwino. Pepalali likuyang'ana kwambiri njira zogwirira ntchito ndi machitidwe osamalira okhudzana ndi njira yofufuzira yamagetsi, cholinga chake ndikuwonjezera kumvetsetsa kwa magwiridwe antchito a chipangizocho ndikuwonjezera kulondola kwa muyeso.

1. Zida ndi Zothandizira
Zipangizo zazikulu: chowunikira khalidwe la madzi chogwira ntchito zambiri
Ma Reagents: omwe amafunikira kuti azindikire mpweya wosungunuka m'thupi (iodometric determination of solved oxygen)

2. Kulinganiza Kwathunthu kwa Meta Yosungunuka ya Oxygen
Njira Yoyesera 1 (Njira Yoyeretsera Mpweya Wokhuta): Pa kutentha kwa chipinda kolamulidwa kwa 20 °C, ikani 1 L ya madzi oyera kwambiri mu beaker ya 2 L. Thirani mpweya wa yankho mosalekeza kwa maola awiri, kenako siyani mpweya ndikulola madziwo kuti akhale olimba kwa mphindi 30. Yambani kuyezetsa mwa kuyika probe m'madzi ndikusakaniza ndi magnetic stirrer pa 500 rpm kapena kusuntha electrode pang'onopang'ono mkati mwa gawo lamadzi. Sankhani "kuyezetsa mpweya wokhuta" pa mawonekedwe a chipangizocho. Mukamaliza, kuwerenga kwathunthu kuyenera kusonyeza 100%.

Njira Yachiwiri Yogwiritsira Ntchito M'ma laboratories (Njira Yothira Mpweya M'madzi): Pa 20 °C, nyowetsani siponji mkati mwa chotchingira cha probe mpaka itadzaza mokwanira. Sungunulani mosamala pamwamba pa nembanemba ya electrode ndi pepala losefera kuti muchotse chinyezi chochulukirapo, lowetsaninso electrode mu chotchingira, ndikulola kuti igwirizane kwa maola awiri musanayambe kulinganiza. Sankhani "kulinganiza mpweya wothira madzi" pa chipangizo cholumikizira. Mukamaliza, kuwerenga kwathunthu nthawi zambiri kumafika 102.3%. Kawirikawiri, zotsatira zomwe zimapezeka kudzera mu njira yothira madzi zimagwirizana ndi zomwe zachokera mu njira yothira madzi m'madzi. Kuyeza kotsatira kwa sing'anga iliyonse nthawi zambiri kumapereka miyeso yozungulira 9.0 mg/L.

Kuyeza Malo: Chidachi chiyenera kuyezedwa musanagwiritse ntchito chilichonse. Popeza kutentha kwakunja nthawi zambiri kumasiyana ndi 20 °C, kuyeza malo kumachitika bwino pogwiritsa ntchito njira ya mpweya wodzaza ndi madzi mkati mwa chogwirira ntchito. Zipangizo zomwe zayezedwa pogwiritsa ntchito njira imeneyi zimakhala ndi zolakwika zoyezera mkati mwa malire ovomerezeka ndipo zimakhalabe zoyenera kugwiritsidwa ntchito m'munda.

3. Kulinganiza kwa Zero-Point
Konzani njira yopanda mpweya mwa kusungunula 0.25 g ya sodium sulfite (Na₂SO₃) ndi 0.25 g ya cobalt(II) chloride hexahydrate (CoCl₂·6H₂O) mu 250 mL ya madzi oyera kwambiri. Imwani probe mu yankho ili ndikuyambitsa pang'onopang'ono. Yambani kuwerengera zero-point ndikudikirira kuti kuwerengako kukhazikike musanatsimikizire kutha. Zipangizo zokhala ndi zolipiritsa zero zokha sizifuna kuwerengera zero pamanja.