Cov txheej txheem tshuaj xyuas cov koob txhaj tshuaj pov tseg rau kev siv tshuaj
1. Cov txheej txheem tshuaj xyuas no muaj feem xyuam rau cov koob txhaj tshuaj pov tseg rau kev xa tawm.
Kev npaj cov tshuaj ntsuam xyuas
a.Siv 3 dispensers random los ntawm tib batch ntawm cov khoom (cov qauv ntim yuav tsum tau txiav txim raws li qhov yuav tsum tau soj ntsuam cov kua ntim thiab dispenser specification), ntxiv dej rau cov qauv mus rau lub nominal muaj peev xwm thiab tso tawm los ntawm lub chav nruas.Tso dej rau hauv lub khob ntim ntawm 37 ℃ ± 1 ℃ rau 8h (los yog 1h) thiab txias rau chav sov li cov kua extraction.
b.Khaws ib feem ntawm cov dej ntawm tib lub ntim rau hauv lub khob ntim raws li kev tswj hwm kev daws teeb meem.
1.1 Extractable hlau ntsiab lus
Muab 25ml ntawm cov tshuaj extraction rau hauv 25ml Nessler colorimetric raj, noj lwm 25ml Nessler colorimetric raj, ntxiv 25ml ntawm txhuas txheej txheem tov, ntxiv 5ml ntawm sodium hydroxide xeem tov rau saum toj no ob colorimetric raj, ntxiv 5 tee ntawm sodium sulfide test tshuaj raws, thiab co li.Nws yuav tsum tsis txhob tob dua li cov keeb kwm dawb.
1.2 pH ua
Siv cov tshuaj a thiab tshuaj b npaj rau saum toj no thiab ntsuas lawv cov pH qhov tseem ceeb nrog ib qho acidimeter.Qhov sib txawv ntawm ob yuav tsum tau ua raws li qhov kev xeem, thiab qhov sib txawv yuav tsum tsis pub tshaj 1.0.
1.3 Residual ethylene oxide
1.3.1 Kev npaj daws teeb meem: saib Cov Ntawv Ntxiv I
1.3.2 Kev npaj cov tshuaj ntsuam xyuas
Cov tshuaj ntsuam xyuas yuav tsum tau npaj tam sim tom qab kuaj, txwv tsis pub cov qauv yuav tsum muab kaw rau hauv ib lub thawv rau khaws cia.
Txiav cov qauv mus rau hauv daim nrog qhov ntev ntawm 5 hli, hnyav 2.0g thiab muab tso rau hauv ib lub thawv, ntxiv 10ml ntawm 0.1mol / L hydrochloric acid, thiab muab tso rau hauv chav tsev kub rau 1h.
1.3.3 Test cov kauj ruam
① Noj 5 Nessler colorimetric hlab thiab ua kom raug ntxiv 2ml ntawm 0.1mol / L hydrochloric acid feem, thiab tom qab ntawd ntxiv 0.5ml, 1.0ml, 1.5ml, 2.0ml, 2.5ml ethylene glycol txheem tov.Siv lwm lub raj Nessler colorimetric thiab ua kom raug ntxiv 2ml ntawm 0.1mol / L hydrochloric acid raws li kev tswj tsis pub muaj.
② Ntxiv 0.4ml ntawm 0.5% periodic acid tov rau hauv txhua qhov ntawm cov hlab ntsha saum toj no thiab muab tso rau 1h.Tom qab ntawd tso cov tshuaj sodium thiosulfate kom txog thaum cov xim daj tsuas yog ploj mus.Tom qab ntawd ntxiv 0.2ml ntawm fuchsin sulfurous acid test tov, dilute nws mus rau 10ml nrog dej distilled, muab tso rau hauv chav tsev kub rau 1h, thiab ntsuas lub absorbance ntawm 560nm wavelength nrog dawb paug raws li siv.Kos absorbance ntim txheem nkhaus.
③ Ua kom raug hloov 2.0ml ntawm cov tshuaj ntsuam xyuas rau hauv Nessler lub colorimetric raj, thiab ua haujlwm raws li cov kauj ruam ②, txhawm rau txheeb xyuas qhov sib thooj ntawm qhov ntsuas los ntawm tus qauv nkhaus nrog ntsuas qhov nqus.Xam qhov tseeb ethylene oxide residue raws li cov qauv hauv qab no:
WEO = 1.775V1 · c1
Qhov twg: WEO - cov ntsiab lus txheeb ze ntawm ethylene oxide hauv cov khoom lag luam, mg / kg;
V1 - sib thooj ntim ntawm cov tshuaj ntsuam xyuas pom ntawm tus qauv nkhaus, ml;
C1 - concentration ntawm ethylene glycol txheem tov, g / L;
Qhov seem ntawm ethylene oxide yuav tsum tsis txhob ntau tshaj 10ug / g.
1.4 Yooj yim oxides
1.4.1 Kev npaj tshuaj: saib Daim Ntawv Ntxiv I
1.4.2 Kev npaj cov tshuaj ntsuam xyuas
Noj 20ml ntawm cov tshuaj ntsuam xyuas tau txais ib teev tom qab kev npaj cov tshuaj extraction a, thiab noj b raws li cov kev daws teeb meem dawb paug.
1.4.3 Cov txheej txheem xeem
Siv 10ml ntawm cov tshuaj extraction, ntxiv rau hauv 250ml iodine volumetric hwj, ntxiv 1ml ntawm dilute sulfuric acid (20%), ntxiv 10ml ntawm 0.002mol / L poov tshuaj permanganate tov, tshav kub thiab boil rau 3min, sai txias, ntxiv 0.1. g ntawm poov tshuaj iodide, nruj nreem ntsaws, thiab co zoo.Tam sim ntawd titrate nrog sodium thiosulfate tus qauv kev daws teeb meem ntawm tib qhov concentration rau lub teeb daj, ntxiv 5 tee ntawm cov hmoov txhuv nplej siab, thiab txuas ntxiv titrating nrog sodium thiosulfate standard tov rau tsis muaj xim.
Titrate qhov kev daws teeb meem dawb paug nrog tib txoj kev.
1.4.4 Cov txiaj ntsig suav:
Cov ntsiab lus ntawm kev txo cov tshuaj (yooj yim oxides) yog qhia los ntawm tus nqi ntawm cov tshuaj poov tshuaj permanganate noj:
V=
Qhov twg: V - ntim ntawm haus poov tshuaj permanganate daws, ml;
Vs - ntim ntawm sodium thiosulfate tov siv los ntawm kev sim tshuaj, ml;
V0 - ntim ntawm sodium thiosulfate tov siv los ntawm cov tshuaj dawb paug, ml;
Cs - qhov tseeb concentration ntawm titrated sodium thiosulfate tov, mol / L;
C0 - concentration ntawm poov tshuaj permanganate daws nyob rau hauv tus qauv, mol / L.
Qhov sib txawv ntawm kev noj cov tshuaj poov tshuaj permanganate ntawm cov tshuaj infusion ntawm lub dispenser thiab cov kev tswj tsis pub muaj kev daws teeb meem ntawm tib batch ntawm tib lub ntim yuav tsum yog ≤ 0.5ml.
Post lub sij hawm: Sep-26-2022
