Ɔkwan bɛn na wɔfa so hu oxygen a apete wɔ nsu mu?
Sɔhwɛ kwan gyinapɛn ahorow a ɛwɔ yɛn man yi mu no bi ne: "Oxygen a wɔapete wɔ nsuo mu a wɔkyerɛ - Iodometric kwan" (GB7489-1987), "Oxygen a wɔapete wɔ nsuo mu a wɔkyerɛ - Electrochemical probe kwan" (HJ506-2009), ne Amerika ASTM gyinapɛn (D888-05). Mmienu a edi kan no yɛ ɔman ne nnwuma gyinapɛn akwan wɔ China, na nea etwa to no yɛ gyinapɛn kwan a U.S. Nneɛma a Atwa Yɛn Ho Ahyia Ho Banbɔ Dwumadibea no gye tom.
Ɔkwan a wɔfa so kyerɛ oxygen a wɔapete wɔ nsuo mu - iodometric kwan
Nnyinasosɛm a ɛfa iodometri kwan a wɔfa so susuw oxygen a wɔapete ho: Wɔtaa de iodometri kwan no na ɛkyerɛ oxygen a apete wɔ nsu mu. Fa manganese sulfate ne alkaline potassium iodide solution gu nsu mu na ama manganese hydroxide a ɛtɔ. Esiane sɛ manganese hydroxide no ntumi nnyina koraa nti, ɛne oxygen a wɔapete wɔ nsu mu no yɛ adwuma ntɛmntɛm ma ɛyɛ manganese sulfate. Simma 15 akyi no, sɛ wɔde sulphuric acid a wɔahyɛ no den ka ho a, ɛma nsu a ɛyɛ bruu no ne potassium iodide a wɔde ahyɛ aduru no mu no yɛ adwuma, na dodow a iodine no dɔɔso no, dodow no ara na oxygen a ɛyɛ hyew no dɔɔso, na dodow no ara na aduru no kɔla yɛ tuntum. Fa pipette fa nsuo a wɔayɛ no adwuma dodoɔ bi, fa starch yɛ sɛnkyerɛnne, fa standard solution titrate, na bu oxygen a apete a ɛwɔ nsuo nhwɛsoɔ no mu no ho akontaa.
Ɔkwan a wɔfa so susuw iodine no wɔ anammɔn a ɛyɛ den na ɛnyɛ nea ɛfata sɛ wɔde susuw wɔ beae hɔ, na ɛma bere tenten a wɔde hu no ba. Wɔ nsu a atɛkyɛ nyin wom mu no, photosynthesis ma oxygen dodow a ɛba no yɛ kɛse, na ebetumi ama oxygen a ɛwɔ nsu no mu no adu tebea a ɛboro so. Saa bere yi de, ɛyɛ den sɛ wɔde iodine kwan no behu oxygen a apete wɔ nsu mu, na nea efi susuw no mu ba no nyɛ pɛpɛɛpɛ sɛnea ɛsɛ.
Ɔkwan a wɔfa so kyerɛ oxygen a wɔapete wɔ nsu mu - electrode polarography
Nnyinasosɛm a ɛwɔ electrode polarography a wɔde susuw oxygen a wɔapete mu: wɔde ahoɔden a ɛkɔ so daa hyɛ electrode abien no ntam, na ɛlɛtrɔnik fi cathode no mu kɔ anode no mu, na ɛma diffusion current ba; Wɔ ɔhyew pɔtee bi mu no, diffusion current no ne oxygen a wɔapete no dodow hyia tẽẽ; Fa abusuabɔ dodow a ɛda oxygen dodow a ɛwɔ hɔ mprempren ne nea wɔapete ntam si hɔ; Adwinnade no dane ammeter akenkan no ma ɛyɛ oxygen a wɔapete dodow no ara na ɛda oxygen a wɔapete no bo adi wɔ screen no so.
Electrode polarography kwan a wɔfa so hu oxygen a apete wɔ nsu mu no wɔ anammɔn a ɛnyɛ den na ɛyɛ ntɛmntɛm, na adwinnade no bo sua koraa, na ɛyɛ ɔman no gyinapɛn kwan no dea. Nanso bere a wɔde oxygen di dwuma no, efĩ bɛba membrane ne electrode no so, na ayɛ oxygen gradient a ɛbɛtew sɛnea ɛyɛ adwuma no so. Sɛ semi permeable membrane no sɛe a, ɛnyɛ den sɛ electrolyte no bɛgu fĩ, na ebetumi ama battery potential drift, na drift no bɛda adi wɔ ɔkwan a ɛnteɛ so sɛ oxygen a apete dodow a ɛwɔ nsu nhwɛsode no mu. Enti, ɛho hia sɛ wɔsesa electrolyte ne semi permeable membrane no daa.
Ɔkwan a wɔfa so kyerɛ oxygen a wɔapete wɔ nsu mu - fluorescence kwan
Nnyinasosɛm a ɛfa fluorescence kwan a wɔfa so susuw oxygen a wɔapete ho: wɔde hann bruu a wɔayɛ no foforo gu nneɛma a ɛma hann so ma ɛkanyan wɔn na ɛma hann kɔkɔɔ ba. Esiane tumi a oxygen molecule ahorow no tumi dum nti, bere ne ahoɔden a hann kɔkɔɔ a ɛyɛ anigye de ba no ne oxygen molecule dodow a ɛwɔ mu no hyia wɔ ɔkwan a ɛne no bɔ abira so. Fa hann kɔkɔɔ fibea a ɛne hann bruu hyia sɛ nhwɛsode di dwuma, susuw nsonsonoe a ɛda kanea kɔkɔɔ a wɔagye no ne hann a wɔde hwɛ ade no ntam wɔ phase mu, na fa toto emu calibration values ho de bu oxygen molecules dodow ho akontaa. Bere bi akyi no, output dissolved oxygen.
Fluorescence LDO kwan a wɔfa so susuw oxygen a apete wɔ nsu mu no yɛ anammɔn a ɛnyɛ den na ɛyɛ ntɛm. Sɛ yɛde toto akwan abien a edi kan no ho a, fluorescence LDO kwan a wɔfa so susuw oxygen a apete wɔ nsu mu no nhia sɛ wɔde calibration, ɛwɔ bere a ɛyɛ ntɛm, nea efi susuw mu ba no yɛ den, enhia sɛ ɛsen, enhia sɛ ɛtwetwe, ɛtew mpɛn dodow a wɔhohoro so, na ɛnhwɛ so pii.