Yiziphi izinzuzo kanye nobubi bendlela ye-reflux titration kanye nendlela esheshayo yokunquma i-COD?

Ukuhlola izinga lamanziUkuhlolwa kwe-CODamazinga:
I-GB11914-89 "Ukunqunywa kwesidingo somoya-mpilo wamakhemikhali ngekhwalithi yamanzi ngendlela ye-dichromate"
HJ/T399-2007 “Ikhwalithi Yamanzi – Ukunqunywa Kwesidingo Se-Chemical Oxygen – Rapid Digestion Spectrophotometry”
I-ISO 6060 "Ukunqunywa kwesidingo samakhemikhali komoyampilo wekhwalithi yamanzi"
Ukunqunywa kwesidingo somoya-mpilo wamakhemikhali wamanzi ngendlela ye-dichromate:
Inombolo ejwayelekile: “GB/T11914-89″
Indlela ye-potassium dichromate isebenzisa ukusebenza kokwelashwa kwangaphambili kokukhipha i-oxidizing ngokugcwele isampula lamanzi esixazululweni se-asidi esiqinile futhi iphinde ifakwe amahora angu-2, ukuze iningi le-organic matter* kusampula yamanzi lifakwe i-oxidized.
Izici: Inezinzuzo zebanga elibanzi lokulinganisa (5-700mg/L), ukukhiqiza kabusha okuhle, ukususwa kokuphazamiseka okuqinile, ukunemba okuphezulu nokunemba, kodwa ngesikhathi esifanayo inesikhathi eside sokugaya kanye nokungcola okukhulu kwesibili, futhi idinga kulinganiswa ngamaqoqo amakhulu amasampula. Ukusebenza kahle kuphansi futhi kunemikhawulo ethile.
ukushiyeka:
1. Kuthatha isikhathi esiningi, futhi isampula ngayinye idinga ukukhishwa kabusha amahora ama-2;
2. Imishini yokugeleza kabusha ithatha indawo enkulu futhi yenza ukukalwa kweqoqo kube nzima;
3. Izindleko zokuhlaziya ziphakeme kakhulu;
4. Phakathi nenqubo yokulinganisa, ukuchithwa kwamanzi okubuyisela kuyamangaza;
5. Usawoti we-mercury onobuthi ungabangela kalula ukungcola kwesibili;
6. Inani lama-reagents likhulu futhi izindleko zezinto ezisetshenziswayo ziphezulu;
7. Inqubo yokuhlola iyinkimbinkimbi futhi ayifanele ukukhushulwa
Izinga lamanzi Ukunqunywa kwesidingo samakhemikhali womoya-mpilo I-spectrophotometry yokugaya ngokushesha:
Inombolo ejwayelekile: HJ/T399-2007
Indlela yokunquma ngokushesha ye-COD isetshenziswa kakhulu ekuqapheni okuphuthumayo kwemithombo yokungcola kanye nokunqunywa kwesilinganiso esikhulu samasampula amanzi angcolile. Izinzuzo eziyinhloko ezivelele zale ndlela ukuthi isebenzisa ama-reagents esampula amancane, yonga amandla, yonga isikhathi, ilula futhi iyashesha, futhi yenza ukushiyeka kwezindlela zokuhlaziya zakudala. Isimiso siwukuthi: endaweni eqinile ye-acidic, phambi kwe-catalyst eyinhlanganisela, isampula yamanzi igaywe ekushiseni okungaguquki kwe-165 ° C imizuzu engu-10. Izinto ezinciphisayo emanzini zikhishwa i-potassium dichromate, futhi ama-ion e-chromium ane-hexavalent ancishiswa abe ama-ion e-chromium e-trivalent. Isidingo sekhemikhali komoyampilo emanzini silingana nokugcwala kwe-Cr3+ okukhiqizwa ngokuncipha. Uma inani le-COD kusampula lingu-100-1000mg/L, linganisa ukumuncwa kwe-chromium eyi-trivalent ekhiqizwa ukuncipha kwe-potassium dichromate kubude begagasi obungu-600nm±20nm; Uma inani le-COD lingu-15-250mg/L, linganisa ukumunca okuphelele kwama-ion amabili e-chromium e-chromium ene-hexavalent encishisiwe kanye ne-chromium encishisiwe ekhiqizwe i-potassium dichromate kubude begagasi obungu-440nm±20nm. Le ndlela isebenzisa o I-Potassium hydrogen phthalate idonsa ijika elijwayelekile. Ngokomthetho kabhiya, phakathi kwebanga elithile lokuhlushwa, ukumuncwa kwesixazululo kunobudlelwano bomugqa nenani le-COD lesampula lamanzi. Ngokuvumelana nokumunca, ijika lokulinganisa lisetshenziselwa ukuliguqula libe isidingo samakhemikhali komoyampilo wesampula lamanzi elilinganisiwe.
Izici: Le ndlela inezinzuzo zokusebenza okulula, ukuphepha, ukuzinza, ukunemba nokuthembeka; inesivinini sokuhlaziya okusheshayo futhi ifanele ukuzimisela ngezinga elikhulu; ithatha indawo encane, idla amandla amancane, isebenzisa amanani amancane ama-reagents, inciphisa uketshezi olungcolile, futhi inciphisa imfucuza yesibili. Ukungcoliswa kwesibili, njll., kusetshenziswa kakhulu ekuqapheni kwansuku zonke kanye nezimo eziphuthumayo, kwenzelwa ukushiyeka kwendlela evamile evamile, futhi kungashintsha indlela endala yokufudumeza isithando somlilo kagesi kazwelonke.