Amasirinji Alahlwayo - Isithasiselo 1
Ukulungiswa kwesixazululo se-ethylene oxide residual
0.1mol/L i-hydrochloric acid: nciphisa i-9ml hydrochloric acid iye ku-1000ml.
Isixazululo sesikhathi esingu-0.5%: kala u-0.5g we-periodation bese unciphisa ku-100ml.
Isixazululo se-sodium thiosulfate: kala u-1g we-sodium thiosulfate bese unciphisa ku-100ml.
Isixazululo esingu-10% se-sodium sulfite: kala u-10. 0g i-anhydrous sodium sulfite, yihlakaze futhi uyihlambulule ibe yi-100ml.
Isixazululo sokuhlola i-Magenta sulfurous acid: kala u-0.1g we-fuchsin eyisisekelo bese wengeza u-120ml wamanzi ashisayo ukuze uyincibilikise.Ngemva kokupholisa, engeza u-20ml we-10% yesisombululo se-sodium sulfite kanye no-2ml we-hydrochloric acid ebumnyameni.Isixazululo sokuhlola kufanele singabi nombala.Uma kutholakala ukuthi sibomvu, kufanele silungiswe kabusha.
Isixazululo esijwayelekile sesitoko se-Ethylene glycol: thatha i-flask eyomile futhi ehlanzekile engu-50ml yevolumu, engeza amanzi angama-30ml, ukale kahle, thatha u-0.5ml ethylene glycol, ungeze ngokushesha ebhodleleni, uyinyakazise, ukale, umehluko phakathi izisindo ezimbili isisindo esiqukethwe ikhambi, engeza amanzi esikalini, mix it up, futhi ubale ukugxila kwawo ngokuvumelana ifomula elandelayo:
C＝W/50 × inkulungwane eyodwa
C: Glycol standard stock solution concentration g/l;
W: Isisindo se-ethylene glycol esixazululweni g
Isixazululo esijwayelekile se-Ethylene glycol: thatha ngokunembile u-1.0ml wesisombululo esijwayelekile sesitoko, bese unciphisa ku-1000ml ngamanzi.
Ukulungiswa kwe-reagent elula ene-oxidized:
a.Nciphisa i-sulfuric acid (20%): Thatha i-H2SO4128ml, kancane kancane ujove u-500mL, bese unciphisa ku-1000mL ngemva kokupholisa.
b.Inkomba yesitashi: thatha u-0.5g wesitashi esincibilikayo, uchithe ku-100ml wamanzi, ushise futhi ubilise, bese usipholisa ngokubekwe eceleni (sizolungiswa kabusha uma sisetshenziswa okwesikhashana)
c.Isixazululo se-Potassium permanganate: thatha u-3.3gKMnO4, engeza u-1050ml wamanzi, ubilise imizuzu engu-15, engeza amanzi ku-1050ml, uwayeke ame izinsuku ezingaphezu kwezinsuku ezimbili ngemva kokuvalwa, uwuhlunge ngefaneli yengilazi encane, uyinyakazise, futhi ulinganise ukugxila kwayo.
Ukulinganisa: Thatha u-0.25g wereferensi ye-sodium oxalate omisiwe esisindweni esingaguquki ku-1050C, yikale ngokunembile, engeza i-100ml yesisombululo se-sulfuric acid (8+92) bese ugoqa ukuze uyincibilikise.Ngokushesha engeza u-25ml wesixazululo esijwayelekile se-KMnO4 ukuze ulinganiswe esixazululweni esivela ku-buret.Ngemva kokufiphala, yishise ibe ngu-650C futhi uqhubeke ushintshashintsha kuze kube yilapho ikhambi liba bomvu futhi lihlala lingashintshiwe ama-30s.Ekupheleni kwe-titration, izinga lokushisa lesisombululo akufanele libe ngaphansi kuka-550C, futhi ukuhlolwa okungenalutho kuzokwenziwa ngesikhathi esifanayo.Njalo u-6.7mg we-sodium oxalate ulingana no-1ml wesisombululo esijwayelekile esingu-0.02mol/L KMnO4.Ukuhlushwa kwangempela kwalesi sixazululo kubalwa ngokusho kokusetshenziswa kwalesi sixazululo kanye nenani le-sodium oxalate ethathwe.
d.C (KMnO4)=0.002 mol/L: Thatha u-0.02 mol/L KMnO4 bese wengeza amanzi ukuze uwaxube izikhathi ezingu-10 ngaphambi kokuwasebenzisa
e.I-sodium thiosulfate (0.1 mol/L): nesisindo esingu-26g Na2S2O3.5H2O noma 16g anhydrous Na2S2O3, engeza u-0.2g anhydrous sodium carbonate, uyihlakaze emanzini angu-1000ml, ubilise kancane kancane imizuzu engu-10, uyipholise, ungeze amanzi amabili emva kuka-10, 0. amasonto, futhi ulinganise ukugxila kwayo.
Ukulinganisa: nesisindo esingu-0.18g sereferensi ye-potassium dichromate omisiwe ku-1200C kuya esisindweni esingaguquki.Kala ngokunembile.Yifake kufulaski wokulinganisa i-iodine, uhlakaze emanzini angu-25ml, ufake u-2g we-potassium iodide kanye no-20ml we-dilute sulfuric acid (20%), unyakazise kahle, uyibeke endaweni emnyama i-10min, engeza u-150ml wamanzi, i-titrate it. ngesixazululo se-Na2S2O3 esilungisiwe [c (Na2S2O3) ＝ 0.1 mol/L], engeza u-2ml wesisombululo senkomba yesitashi (10g/L) ekugcineni, qhubeka ushintshashintsha kuze kube yilapho isixazululo sishintsha sisuka kokuluhlaza okwesibhakabhaka siye kokuluhlaza okotshani, futhi wenze ukuhlolwa okungenalutho ngesikhathi esifanayo.Yonke i-1ml ye-Na2S2O3 (0.1 mol/L) ilingana no-4.9031mg we-potassium dichromate.Ukuhlushwa kwalesi sixazululo kubalwa ngokusho kokusetshenziswa kwalesi sixazululo kanye nenani le-potassium dichromate elithathiwe.
f.C (Na2S2O3) ＝ 0.01 mol/L: nciphisa u-0.1 mol/L Na2S2O3 ngamanzi asanda kubiliswa napholile ngaphambi kokuma izikhathi ezingu-10.
Isikhathi sokuthumela: Oct-04-2022
