Kwadalwa ngo Ngokwamukisa

Ukuqeda Ukukhuphuka Kwesisekelo kanye Nokopha Okuphezulu Kwesigaba Ku-Trace Halocarbon kanye ne-VOC GC-MS

Ekuhloleni kwemvelo (isb., Izindlela ze-EPA 524.2, 624.1, 8260D) kanye nokuhlaziywa kwezincibilikisi ezisele kwezemithi (USP <467>), ukutholwa kwezinga elincane kakhulu lama-hydrocarbon e-halogenated—njenge-chloroform, i-bromoform, i-carbon tetrachloride, nama-chlorobenzenes—kudinga ukuzinza okukhethekile kwesisekelo. Ukukhungatheka okusabalele okuhlangatshezwa ngabasebenzisi be-GC ne-GC-MS abasebenzisa amakholomu ajwayelekile ohlobo lwe-624 (i-6% cyanopropylphenyl / 94% dimethylpolysiloxane) noma ohlobo lwe-5MS ​ukuhlehla okukhulu "okunjengomgqaso" kwesisekelo lapho izinga lokushisa lika-oveni lidlula u-220°C–240°C​. Lokhu konakala kokushisa kufihla ama-analyte asemgqeni wokugcina noma abilayo aphansi, kuhlanekezela ukuhlanganiswa kwama-peak, kubeka engcupheni izilinganiso ze-signal-to-noise (S/N), futhi kuphoqa abahlaziyi ukuthi bangene emijikelezweni ephindaphindayo, echitha isikhathi yokushisa ikholomu okunciphisa impilo yekholomu.

I-chromatogram ye-GC-MS ekhombisa ukukhukhuleka kwesisekelo okufana ne-ramp ngaphezu kuka-220°C ekuhlaziyweni kwe-VOC e-halogenated ngamakholomu ohlobo luka-624

Okubalulekile Okutholakele

Imbangela Ye-Ramp Drift:
Inhlawulo Yokuhlaziya:
Isixazululo Sobunjiniyela: Izigaba zesigaba esimile ezixhunyiwe zesizukulwane sesine eziboshwe ngomhwamuko (CHANCE-624 Ultra-Low Bleed)35%10°C–15°C ku-260°C

Ukukhishwa Kwezinga Lokushisa Eliphezulu Ne-Mechanism Yokonakala Kwesigaba

Isigaba / Isinyathelo	Inqubo Ye-Thermal Ne-Chemical	Umphumela We-Chromatographic Ne-MS
1. Ukukhuphuka Kwezinga Lokushisa Okuhleliwe	Izinga lokushisa lika-oveni likhuphuka lidlule ebangeni lika-220°C–260°C ukuze kukhishwe ama-VOC anezinga lokushisa eliphezulu kanye nezingxenye ze-solvent zakamuva	Amandla okushisa acindezela umgogodla we-cyanopropylphenyl siloxane ezigabeni ezijwayelekile ze-624
2. Ukuhlukaniswa Komgogodla We-Polymer	I-oksijini ye-carrier gas elandelelayo noma ama-silanol angavulwanga adala ukunqanyulwa kwamaketanga okubangelwa ama-radical	I-polymer yesigaba esimile iwohloka ibe ama-oligomer e-cyclic siloxane akhukhulayo
3. Ukukhishwa Okuqhubekayo Kwesigaba Somhwamuko	Izingcezu zesigaba esikhishiwe ziphuma ngokuqhubekayo ngokulingana nezinga lokushisa elikhuphukayo	Ukuphakama komugqa oyisisekelo okunyukayo, okufana ne-ramp engxenyeni yesibili yokugcina yokugijima
4. Ukuhlanganiswa Nokuhlanekezelwa Kwe-Spectral	Isisekelo esiphakeme sigcwalisa umqoqi we-FID noma umthombo we-MS ionization	I-S/N yehla ngokushesha okukhulu , ama-halogenated peaks anokugxila okuphansi ayafihlwa, futhi izikolo zokufanisa zelabhulali ziyehluleka

Umdwebo wokugqashuka komgogodla wesigaba esimile se-siloxane kanye nendlela yokopha kwe-cyclic oligomer ebangela ukukhuphuka kwesisekelo se-GC

Imikhono Yezobuchwepheshe: Amakholomu e-624 Ajwayelekile vs. I-CHANCE-624 Ultra Series

Ipharamitha Yokusebenza	Impahla / Amakholomu e-624 Ajwayelekile	Indinganiso Yomkhakha (DB-624 / Rtx-624)	I-CHANCE-624 Ultra-Low Bleed Series
Ubuchwepheshe Bokuxhumanisa I-Polymer	Ukuxhumanisa okujwayelekile kwesigaba se-solution	I-silphenylene exhunyiwe futhi exhumanisiwe	I-Gen-4 Advanced Vapor-Phase Covalent Cross-Linking
Ukuminyana Kokuvikela Kwe-Surface Silanol	Isisekelo esijwayelekile	Phezulu	+35% Covalent Surface Anchoring Density
Izinga Lokushisa Eliphezulu Le-Isothermal	240°C	260°C	260°C (Ukuzinza Okwandisiwe Kwezinga Lokushisa)
Izinga Lokushisa Eliphezulu Elihleliwe	250°C – 260°C	260°C	280°C (Iwindi Lokususa Kwezinga Lokushisa Eliphezulu)
Izinga Lokopha ku-250°C (FID)	> 12 − 25 pA (ukudonsa okukhulu)	4 − 7 pA	(Iphrofayela Yesisekelo Esiseduze Nokucaba)
Ama-Ion e-Bleed Mass ku-GC-MS	Kakhulu m / z 207 , 281 , 355 amaqoqo	Linganiselwe m / z 207	Ama-Ion e-Siloxane Angemuva Aseduze Nokungabi Nakho
Isikhathi Sokulinganisa Ngemva Koku-Bakeout	45 – 90 min ngemva kokuphola	20 – 30 min	(Ukuzinza Kwesisekelo Okusheshayo)
Ukudonsa Kwesikhathi Sokugcina Kwamaqoqo (RSD)	> 0.10 min ngemva kwemijikelezo engu-150	< 0.05 min	(Isikhathi Sokugcinwa Kwesigaba Esandisiwe)

Ukuqhathaniswa kwesisekelo esikhukhulekayo kumakholomu ajwayelekile angu-624 nesesisekelo esicwebezelayo sokopha okuphansi kakhulu kumakholomu e-CHANCE-624 GC

Izinqubo Eziyisihlanu Ezinhle Kakhulu Zokuvimbela Ukukhuphuka Kwe-Baseline Ezinhlelweni Zokushisa Ze-VOC

Hlanza Igesi Ephathayo Ibe Sezingeni Le-Oxygen Engaphansi Kwe-ppm:
Gwema Amazinga Okushisa Okulungisa Awedlulele: imizuzu engu-15 ku-10°C ngaphezu kwezinga lokushisa lokugcina lendlela yakho yokuhlaziya
Nqamula Amakhanda Ekholomu Ngezikhathi Ezithile Esikhundleni Sokuphinda Ubhake: 0.2 m kuya ku-0.5 m
Sebenzisa Izakhiwo Zezigaba Ezikhethekile Zokopha Okuphansi Kakhulu:

Amakholomu e-Capillary e-CHANCE-624 & CHANCE-5MS Okopha Okuphansi Kakhulu

Aklanyelwe ngokukhethekile izindlu zokuhlola zokuhambisana nemvelo, izikhungo ze-QC zemithi, kanye nokuhlolwa kwe-toxicological:

I-Gen-4 Vapor-Phase Chemical Cross-Linking: 260°C / 280°C
Ukuphindaphinda Kwe-Peak Symmetry Ezingeni Elincane Okuqinisekisiwe:
Ukufaka Esikhundleni Se-OEM Okuqondile:

umhlahlandlela wokukhethwa kwesigaba kanye nobukhulu" query="Nikeza ubukhulu bekholomu, izicaciso zesilinganiso sesigaba, nama-chromatogram okuhlukanisa ama-volatile organic compounds nezincibilikisi ezisele ku-CHANCE-624." />

Thintana nathi

Ukuhlanganisa Ubusha, Ukusebenzisa Izitayela.

Ngokubhalisa incwadi yethu yezindaba, uyavuma neMigomo Yethu Yesevisi kanye neNqubomgomo Yobumfihlo.

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