Ziziphi iingenelo kunye nokungalunganga kwendlela ye-reflux titration kunye nendlela ekhawulezayo yokumisela i-COD?

Uvavanyo lomgangatho wamanziUvavanyo lwe-CODimigangatho:
I-GB11914-89 "Ukumiselwa kwemfuno ye-oksijini yeekhemikhali kumgangatho wamanzi ngendlela ye-dichromate"
I-HJ/T399-2007 “Umgangatho waManzi – Ukumiselwa kweMfuno ye-Oxygen yeMichiza – iSpectrophotometry yokugaya ngokukhawuleza”
I-ISO 6060 "Ukumiselwa kwemfuno yeoksijini yeekhemikhali zomgangatho wamanzi"
Ukumiselwa kwemfuno yeekhemikhali zamanzi nge-dichromate method:
Inombolo eqhelekileyo: “GB/T11914-89″
Indlela ye-potassium ye-dichromate isebenzisa i-pretreatment operation ye-oxidizing ngokupheleleyo isampuli yamanzi kwisisombululo esinamandla se-asidi kunye nokuyibuyisela kwiiyure ze-2, ukwenzela ukuba ininzi yezinto eziphilayo * kwisampuli yamanzi i-oxidized.
Iimpawu: Ineenzuzo zoluhlu olubanzi lokulinganisa (5-700mg / L), ukuveliswa kakuhle, ukususwa kokuphazamiseka okunamandla, ukuchaneka okuphezulu kunye nokuchaneka, kodwa kwangaxeshanye inexesha elide lokugaya kunye nongcoliseko olukhulu lwesibini, kwaye kufuneka ukuba ilinganiswe ngeebhetshi ezinkulu zeesampulu. Ukusebenza kakuhle kuphantsi kwaye kunemida ethile.
ukusilela:
1. Kuthatha ixesha elininzi, kwaye isampuli nganye kufuneka ihlaziywe ngeeyure ze-2;
2. Isixhobo sokubuyisela kwakhona sithatha indawo enkulu kwaye yenza umlinganiselo webhetshi ube nzima;
3. Iindleko zokuhlalutya ziphezulu kakhulu;
4. Ngethuba lenkqubo yokulinganisa, ukuchithwa kwamanzi okubuyisela kuyamangalisa;
5. Iityuwa zemercury ezinetyhefu zinokubangela lula ungcoliseko lwesibini;
6. Isixa se-reagents sikhulu kwaye iindleko zokusetyenziswa ziphezulu;
7. Inkqubo yovavanyo inzima kwaye ayifanelekanga ukunyuselwa
Umgangatho wamanzi Ukumiselwa kwemfuno yemichiza yeoksijini Umehluko okhawulezileyo wokugaywa kwe-spectrophotometry:
Inombolo eqhelekileyo: HJ/T399-2007
Indlela yokuzimisela ngokukhawuleza ye-COD isetyenziswa ikakhulu ekubekweni kweliso olungxamisekileyo lwemithombo yongcoliseko kunye nokuzimisela okukhulu kweesampulu zamanzi amdaka. Iinzuzo eziphambili ezibalaseleyo zale ndlela kukuba isebenzisa ii-reagents zesampula encinci, igcina amandla, igcina ixesha, ilula kwaye iyakhawuleza, kwaye yenza ukusilela kwiindlela zokuhlalutya zakudala. Umgaqo-siseko ngulo: kwindawo eqinile ye-acidic, phambi kwe-catalyst edibeneyo, isampuli yamanzi igaywe kwiqondo lokushisa elingaguqukiyo le-165 ° C imizuzu eyi-10. Izinto ezinciphisa emanzini zixutywa yi-potassium dichromate, kwaye ii-ion ze-chromium ezinehexavalent ziyancitshiswa zibe yi-trivalent chromium ion. Imfuno ye-oksijini yeekhemikhali emanzini ilingana nokuxinana kwe-Cr3 + eveliswa ngokunciphisa. Xa ixabiso le-COD kwisampulu yi-100-1000mg / L, ukulinganisa ukufunxa kwe-chromium ye-trivalent eveliswe ngokunciphisa i-potassium dichromate kwi-wavelength ye-600nm±20nm; Xa ixabiso le-COD liyi-15-250mg/L, yenza umlinganiselo wokufunxa iyonke yeeyoni ezimbini ze-chromium ze-chromium enehexavalent engancitshiswanga kunye ne-trivalent chromium eveliswe yi-potassium dichromate kwi-wavelength ye-440nm±20nm. Le ndlela isebenzisa o Potassium hydrogen phthalate izoba igophe eliqhelekileyo. Ngokomthetho weBeer, ngaphakathi koluhlu oluthile loxinaniso, ukutsalwa kwesisombululo kunobudlelwane bomgca kunye nexabiso le-COD yesampuli yamanzi. Ngokwe-absorbection, i-curve calibration isetyenziselwa ukuyiguqula ibe yimfuno ye-oksijini yemichiza yesampuli yamanzi elinganisiweyo.
Iimpawu: Le ndlela ineenzuzo zokusebenza okulula, ukhuseleko, ukuzinza, ukuchaneka nokuthembeka; inesantya sokuhlalutya ngokukhawuleza kwaye ifanelekile ukuzimisela okukhulu; ithatha indawo encinci, isebenzisa amandla amancinci, isebenzisa izixa ezincinci ze-reagents, inciphisa inkunkuma yolwelo, kwaye inciphisa inkunkuma yesibini. Ungcoliseko lwesibini, njl., lusetyenziswa ngokubanzi kwimihla ngemihla kunye nokubeka iliso likaxakeka, ukwenza iintsilelo zendlela yomgangatho oqhelekileyo, kwaye unokutshintsha indlela yokufudumeza yombane endala yombane welizwe.