{"id":154720,"date":"2021-02-26T14:20:08","date_gmt":"2021-02-26T14:20:08","guid":{"rendered":"https:\/\/blog.hannaservice.eu\/rastvoreni-kiseonik\/"},"modified":"2022-10-07T14:37:01","modified_gmt":"2022-10-07T14:37:01","slug":"rastvoreni-kiseonik","status":"publish","type":"post","link":"https:\/\/blog.hannaservice.eu\/sr\/rastvoreni-kiseonik\/","title":{"rendered":"Rastvoreni kiseonik"},"content":{"rendered":"\t\t
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Rastvoreni kiseonik (DO) meri koli\u010dinu rastvorenog kiseonika u sistemu. Merenja se obi\u010dno vode u vodi pomo\u0107u DO sonde i mera\u010da.<\/span><\/p>\n

\nTeorija i merenje rastvorenog kiseonika<\/h2>\n

Rastvoreni kiseonik (DO) meri koli\u010dinu rastvorenog kiseonika u sistemu. <\/span>Merenja se obi\u010dno vode u vodi pomo\u0107u DO sonde i mera\u010da. Henryjev zakon navodi da je koncentracija plina u rastvoru direktno proporcionalna delimi\u010dnom pritisku tog plina iznad rastvora. Konstanta Henryevog zakona faktor je proporcionalnosti i tako je specifi\u010dna za plin u rastvara\u010du koje se meri.<\/p>\n

Delimi\u010dni pritisak kiseonika zapravo je merenje termodinami\u010dke aktivnosti njegovih molekula. Brzina otapanja, difuzije i reakcije kiseonika ne odre\u0111uje se njegovom koncentracijom, ve\u0107 parcijalnim pritiskom. Zemljina atmosfera sastoji se od 20,9% kiseonika, a na nivou mora atmosfera je 100% zasi\u0107ena kiseonikom.<\/p>\n

Postotak zasi\u0107enja je koli\u010dina prisutnog DO po koli\u010dini DO mogu\u0107a pri odre\u0111enoj temperaturi i pritisku. Procentna zasi\u0107enost uobi\u010dajena je jedinica za merenje DO jer se temelji na parcijalnom pritisku plina; stoga je ispravno za odre\u0111ivanje u bilo kojem rastvoru.<\/p>\n

Merenja koncentracije DO tako\u0111e mogu koristiti jedinice delova na milion (ppm) ili miligrama po litri (mg \/ L). U metrima koji pokazuju koncentraciju DO u ppm ili mg \/ L, uvek se pretpostavlja da je rastvara\u010d voda. U drugim rastvorima poput ulja ili kiselina, konstanta Henryevog zakona bila bi druga\u010dija. U tim slu\u010dajevima treba koristiti postotnu zasi\u0107enost jer nije ispravno koristiti ppm ili mg \/ l.<\/p>\n

U\u010dinci temperature i pritiska<\/h2>\n

Kako se temperatura ratsvora pove\u0107ava, kretanje \u010destica unutar tog rastvora raste. Uz ve\u0107e kretanje \u010destica, otopljeni plinovi lak\u0161e izlaze iz rastvora. U toploj vodi kiseonik je manje topljiv, dok je u hladnoj vodi topljiviji. Koncentracija DO u vodama zasi\u0107enim zrakom opada sa porastom temperature.<\/p>\n

Atmosferski pritisak opada sa porastom nadmorske visine. Budu\u0107i da je ni\u017ei parcijalni pritisak, kiseonik je manje topljiv na ve\u0107im nadmorskim visinama. Koncentracija DO u vodama zasi\u0107enim zrakom opada sa porastom povi\u0161enja.<\/p>\n

Prijave
\nMerenja kakvo\u0107e vode od vitalnog su zna\u010daja za pra\u0107enje okoli\u0161a. U mirnim jezerima i rekama propadanje organske materije mo\u017ee uzrokovati pove\u0107anje nivoa bakterija. Aerobne bakterije tro\u0161e kiseonik, \u0161to pokre\u0107e nedostatak koji mo\u017ee dovesti do toga da vodno telo „umre“, usmr\u0107uju\u0107i vodene biljke i \u017eivotinje.<\/p>\n

Akvakultura je uzgoj, uzgoj i berba biljaka i \u017eivotinja u svim vrstama vodenih okru\u017eenja. Rastvoreni kiseonik potreban je ribi, zooplanktonu i biljkama da bi pre\u017eiveli i razmno\u017eavali se. DO merenja koriste se za pra\u0107enje i kontrolu okoline potrebne za uspeh.<\/p>\n

Postrojenja za pro\u010di\u0161\u0107avanje otpadnih voda oslanjaju se na bakterije kako bi razgradile organske spojeve koji se nalaze u vodi. Ako je koli\u010dina otopljenog kisika u otpadnoj vodi preniska, ove \u0107e bakterije umrijeti i do\u0107i \u0107e do septi\u010dkih uvjeta. Koli\u010dina DO mora se stalno pratiti kako bi se osiguralo pravilno postupanje s otpadom.<\/p>\n

Laboratorijsko pra\u0107enje BPK, NA\u0160E i KISELO
\nBPK (biohemijska potra\u017enja za kiseonikom) merenje je koje pokazuje koncentraciju biorazgradive organske materije prisutne u uzorku vode. Mo\u017ee se koristiti za odre\u0111ivanje op\u0161te kakvo\u0107e vode i stepena one\u010di\u0161\u0107enja. BPK meri brzinu unosa kiseonika mikroorganizmima u uzorku vode pri fiksnoj temperaturi tokom odre\u0111enog vremenskog razdoblja. Kako bi se osiguralo da su svi ostali uslovi jednaki, u svaki uzorak koji se ispituje dodaje se vrlo mala koli\u010dina semena mikroorganizama. Uzorci se dr\u017ee pet dana na 20 \u00b0 C u mraku. Gubitak rastvorenog kieonika tokom inkubacije naziva se BPK5. BPK je empirijski test koji odre\u0111uje relativne potrebe kiseonika za otpadne vode, otpadne vode i zaga\u0111ene vode.<\/p>\n

NA\u0160 (stopa unosa kiseonika) koristi se za odre\u0111ivanje biolo\u0161ke aktivnosti sistema u smislu potro\u0161nje kisika ili brzine disanja. Defini\u0161e se kao miligrami po litri potro\u0161enog kiseonika na sat. Ovo merenje pokazuje brzinu metaboli\u010dkih procesa u obradi mulja, poma\u017eu\u0107i operaterima da utvrde stabilnost krutina nakon probave.<\/p>\n

SOUR (specifi\u010dna brzina unosa kiseonika) tako\u0111e odre\u0111uje potro\u0161nju kiseonika u sistemu, ali defini\u0161e se kao miligram kiseonika potro\u0161en po gramu hlapivih suspendiranih krutina (VSS) na sat. Ovo brzo merenje ima brojne prednosti: brza mera uticajnog organskog optere\u0107enja i biorazgradivosti, indikacija prisutnosti otrovnog ili inhibicijskog otpada, stepen stabilnosti i stanja uzorka te izra\u010dunavanje potro\u0161nje kiseonika na razli\u010ditim ta\u010dkama u zra\u010dnom bazenu.<\/p>\n

Vrste sondi za rastvoreni kieonik<\/h2>\n

Hannini mera\u010di rastvorenog kieonika koriste jednu od dve uobi\u010dajene vrste osetljivih sondi: polarografske senzore i galvanske senzore.<\/p>\n

Polarografske DO sonde sastoje se od radne elektrode (katoda) i kontra elektrode (anode). Na te se elektrode primenjuje polarizacijski napon koji je specifi\u010dan za smanjenje kiseonika. Tanka, propusna za plin membrana izolira senzorske elemente od uzorka vode, ali omogu\u0107uje prolazak kiseonika. Kiseonik koji prolazi kroz membranu smanjuje se na katodi, uzrokuju\u0107i struju iz koje se odre\u0111uje koncentracija kiseonika. Dvoelektrodne polarografske sonde koriste anodu kao referentnu elektrodu.<\/p>\n

Galvanske DO sonde sastoje se od radne elektrode (katode) i kontra elektrode (anode) koje deluju kao baterija za stvaranje napona specifi\u010dnog za smanjenje kiseonika. Tanka, propusna za plin membrana izolira senzorske elemente od uzorka vode, ali omogu\u0107uje prolazak kiseonika. Kiseonik koji prolazi kroz membranu smanjuje se na katodi, uzrokuju\u0107i struju iz koje se odre\u0111uje koncentracija kisika.<\/p>\n

Na vino i pivo kiseonik uti\u010de u razli\u010ditim fazama tekom proizvodnje i skladi\u0161tenja. DO je va\u017ean parametar za pra\u0107enje onih koji \u017eele proizvoditi konzistentne proizvode visokog kvaliteta.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Rastvoreni kiseonik (DO) meri koli\u010dinu rastvorenog kiseonika u sistemu. 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