Munharaunda yatinogara, kuchengetedzwa kwemhando yemvura chinhu chakakosha. Zvisinei, kunaka kwemvura hakusi pachena nguva dzose, uye inovanza zvakavanzika zvakawanda zvatisingagoni kuona zvakananga nemaziso edu asina kupfeka. Kemikari okisijeni inoda (COD), sechinhu chakakosha pakuongorora kwemhando yemvura, yakafanana nemutongi asingaoneki anogona kutibatsira kuyera uye kuongorora zviri mukati meiyo organic zvinosvibisa mumvura, zvichibva zvaratidza mamiriro echokwadi emhando yemvura.
Fungidzira kana tsvina mukicheni yako yakavharwa, pachava nekunhuhwirira kusingafadzi? Kunhuwa ikoko kunogadzirwa nekuvirisa kwe organic matter munzvimbo isina oxygen. COD inoshandiswa kuyera kuti okisijeni yakawanda sei inodiwa kana organic matter iyi (nezvimwe zvinhu zvinogona kuita oxidizable, zvakaita senitrite, ferrous salt, sulfide, etc.) zvaiswa oxidized mumvura. Zvichitaurwa zviri nyore, iyo yakakwirira kukosha kweCOD, iyo yakanyanya kukomba iyo muviri wemvura unosvibiswa neorganic zvinhu.
Kuonekwa kweCOD kune kwakakosha kunoshanda kwakakosha. Icho chimwe chezviratidzo zvakakosha zvekuyera chiyero chekusvibiswa kwemvura. Kana iyo COD yakakosha yakawandisa, zvinoreva kuti iyo yakanyungudutswa okisijeni mumvura ichapedzwa muhuwandu hukuru. Nenzira iyi, zvipenyu zvemvura zvinoda okisijeni kuti zvirarame (zvakadai sehove uye shrimp) zvichatarisana nedambudziko rekurarama, uye zvinogona kutotungamirira kune chiitiko che "mvura yakafa", zvichiita kuti zvisikwa zvose zviputse. Naizvozvo, kugara uchiyedzwa kweCOD kwakafanana nekuongorora muviri wemhando yemvura, kuwana nekugadzirisa matambudziko nenguva.
Nzira yekuona sei kukosha kweCOD yemasampuli emvura? Izvi zvinoda kushandiswa kweimwe nyanzvi "zvombo".
Nzira inonyanya kushandiswa ndeye potassium dichromate nzira. Zvinonzwika zvakaoma, asi musimboti wacho uri nyore kwazvo:
Nhanho yekugadzirira: Chekutanga, isu tinofanirwa kutora imwe huwandu hwemvura sampu, tobva tawedzera potassium dichromate, "super oxidant", towedzera imwe sirivheri sulfate secatalyst kuita kuti mhinduro yacho inyatsoita. Kana pane chloride ions mumvura, inofanira kudzivirirwa ne mercuric sulfate.
Heating reflux: Tevere, kupisa misanganiswa iyi pamwe chete uye uite kuti iite mukubikira sulfuric acid. Iyi nzira yakafanana nekupa sampu yemvura "sauna", ichiratidza zvinosvibisa.
Titration ongororo: Mushure mekuita kwapera, isu tichashandisa ammonium ferrous sulfate, "inoderedza mumiririri", kuti tite yasara potassium dichromate. Nekuverenga kuti yakawanda sei yekudzikisa mujenti inopedzwa, tinogona kuziva kuti yakawanda sei okisijeni yakashandiswa kuokisisa zvinosvibisa mumvura.
Mukuwedzera kune nzira ye potassium dichromate, kune dzimwe nzira dzakadai se potassium permanganate nzira. Vane zvakanakira zvavo, asi chinangwa chakafanana, chiri kunyatsoyera kukosha kweCOD.
Parizvino, iyo yekukurumidza digestion spectrophotometry nzira inonyanya kushandiswa kuona COD mumusika wepamba. Iyi inzira inokurumidza yekuona COD yakavakirwa pa potassium dichromate nzira, uye inoshandisa chiyero chepolicy "HJ/T 399-2007 Water Quality Determination of Chemical Oxygen Demand Rapid Digestion Spectrophotometry". Kubva 1982, VaJi Guoliang, muvambi weLianhua Technology, vakagadzira COD nekukurumidza digestion spectrophotometry uye zviridzwa zvinoenderana. Mushure memakore anopfuura makumi maviri ekusimudzirwa uye mukurumbira, zvakazove chiyero chenyika chezvakatipoteredza muna 2007, zvichiunza kuonekwa kweCOD munguva yekukurumidza kuonekwa.
Iyo COD yekukurumidza digestion spectrophotometry yakagadziriswa neLianhua Technology inogona kuwana chaiyo COD mhinduro mukati memaminitsi makumi maviri.
1. Tora 2.5 ml yemuenzaniso, wedzera reagent D uye reagent E, uye zunza zvakanaka.
2. Pisa COD digester kusvika 165 degrees, woisa sampu mukati uye kugaya kwemaminitsi gumi.
3. Mushure mekunge nguva yapera, tora muenzaniso uye utonhodze kwemaminitsi maviri.
4. Wedzera 2.5 ml yemvura yakasvibiswa, zunza zvakanaka uye uitonhorere mumvura kwemaminitsi maviri.
5. Isa muenzaniso muCOD photometerye colorimetry. Hapana kuverenga kunodiwa. Mibairo yacho inoratidzwa otomatiki uye inodhindwa kunze. Zviri nyore uye nekukurumidza.
Nguva yekutumira: Jul-25-2024
