Menene fa'idodi da rashin amfani na hanyar reflux titration da kuma saurin hanyar don ƙaddara COD?

Gwajin ingancin ruwaGwajin CODma'auni:
GB11914-89 "Ƙaddarar buƙatar iskar oxygen a cikin ingancin ruwa ta hanyar dichromate"
HJ/T399-2007 "Ingantacciyar Ruwa - Ƙaddamar da Buƙatun Sinadarai na Oxygen - Spectrophotometry mai narkewa"
TS ISO 6060: Tabbatar da buƙatar iskar oxygen na ingancin ruwa
Ƙaddamar da buƙatar iskar oxygen ta ruwa ta hanyar dichromate:
Daidaitaccen lamba: “GB/T11914-89″
Hanyar potassium dichromate tana amfani da aikin pretreatment na cikakken oxidizing da samfurin ruwa a cikin wani karfi acid bayani da refluxing shi na 2 hours, sabõda haka, mafi yawan kwayoyin halitta * a cikin samfurin ruwa ne oxidized.
Features: Yana da abũbuwan amfãni daga m kewayon ma'auni (5-700mg / L), mai kyau reproducibility, karfi tsangwama kau, high daidaito da kuma daidaici, amma a lokaci guda yana da dogon narkewa lokaci da kuma babban sakandare gurbatawa, kuma yana bukatar ya zama. auna a cikin manyan batches na samfurori. Ingancin yana da ƙasa kuma yana da ƙayyadaddun iyaka.
kasawa:
1. Yana ɗaukar lokaci mai yawa, kuma kowane samfurin yana buƙatar sake sakewa don 2 hours;
2. Kayan aikin sake kwarara ya mamaye babban sarari kuma yana sa ma'aunin batch wahala;
3. Kudin bincike yana da inganci;
4. A lokacin aikin aunawa, sharar da ruwa mai dawowa yana da ban mamaki;
5. Gishirin mercury mai guba na iya haifar da gurɓataccen gurɓataccen abu cikin sauƙi;
6. Adadin reagents yana da girma kuma farashin kayan amfani yana da yawa;
7. Tsarin gwaji yana da rikitarwa kuma bai dace da haɓakawa ba
Ƙayyadaddun ingancin ruwa Ƙayyade buƙatun sinadarai na iskar oxygen spectrophotometry na narkewa cikin sauri:
Daidaitaccen lamba: HJ/T399-2007
Ana amfani da hanyar tantance saurin COD a cikin gaggawar sa ido kan hanyoyin gurɓata yanayi da ƙayyadaddun ƙayyadaddun samfuran ruwan sharar gida. Babban fice abũbuwan amfãni daga wannan hanya ne cewa shi yana amfani da kasa samfurin reagents, ceton makamashi, ceton lokaci, shi ne mai sauki da kuma sauri, da kuma sa up for shortcomings na classic bincike hanyoyin. Ka'idar ita ce: a cikin tsaka-tsaki mai karfi na acidic, a gaban mai haɗakarwa, samfurin ruwa yana narkewa a cikin zafin jiki na 165 ° C na minti 10. Abubuwan da ke ragewa a cikin ruwa suna oxidized ta potassium dichromate, kuma ions na chromium na hexavalent an rage su zuwa ions chromium trivalent. Bukatar sinadarai na iskar oxygen a cikin ruwa ya yi daidai da tattarawar Cr3+ da aka samar ta hanyar raguwa. Lokacin da ƙimar COD a cikin samfurin shine 100-1000mg/L, auna ɗaukar chromium trivalent da aka samar ta hanyar raguwar potassium dichromate a tsawon 600nm± 20nm; Lokacin da ƙimar COD ta kasance 15-250mg/L, auna jimillar ɗaukar ions na chromium guda biyu na chromium hexavalent mara raguwa da rage trivalent chromium wanda potassium dichromate ke samarwa a tsawon 440nm±20nm. Wannan hanyar tana amfani da o Potassium hydrogen phthalate yana zana daidaitaccen lankwasa. Dangane da dokar Beer, a cikin takamaiman kewayon maida hankali, ɗaukar maganin yana da alaƙar layi tare da ƙimar COD na samfurin ruwa. Dangane da abin sha, ana amfani da madaidaicin daidaitawa don canza shi zuwa sinadarai na iskar oxygen na samfurin ruwa da aka auna.
Siffofin: Wannan hanya tana da fa'idodin aiki mai sauƙi, aminci, kwanciyar hankali, daidaito da aminci; yana da saurin bincike mai sauri kuma ya dace da ƙaddarar ƙima; yana ɗaukar ƙaramin sarari, yana cinye makamashi kaɗan, yana amfani da ƙaramin adadin reagents, yana rage sharar ruwa, kuma yana rage sharar gida na biyu. Na biyu gurbatawa, da dai sauransu, shi ne yadu amfani a kullum da kuma gaggawa saka idanu, yin up for shortcomings na classic misali hanya, kuma zai iya maye gurbin tsohon lantarki tanderun dumama kasa misali reflow hanya.