Inkinga ecashile kumathoyizi
I-Chromium iyinsimbi eningi, evame kakhulu i-Cr (III) ne-Cr (VI).Phakathi kwazo, ubuthi be-Cr (VI) bungaphezu kwezikhathi ze-100 ze-Cr (III), ezinomthelela omkhulu kakhulu onobuthi kubantu, izilwane kanye nezinto eziphilayo zasemanzini.Ifakwe kuhlu njenge-carcinogen yekilasi I yi-ejensi yamazwe ngamazwe yocwaningo lomdlavuza (IARC).Kodwa abantu abaningi abazi ukuthi kunenhlekelele ye-Cr (VI) eyeqile kumathoyizi ezingane!
I-Cr (VI) kulula kakhulu ukumuncwa umzimba womuntu.Ingahlasela umzimba womuntu ngokugaya ukudla, umgudu wokuphefumula, isikhumba kanye nolwelwesi lwamafinyila.Kuye kwabikwa ukuthi lapho abantu bephefumula umoya oqukethe ukugxilisa okuhlukene kwe-Cr (VI), bazoba namazinga ahlukene okuhoshozela, i-atrophy ye-nasal mucosa, ngisho nokubhobozwa kwe-septum yamakhala kanye ne-bronchiectasis.Kungabangela ukuhlanza nobuhlungu besisu.I-Dermatitis ne-eczema kungenzeka ngokuhlaselwa kwesikhumba.Okuyingozi kakhulu ukuchayeka isikhathi eside noma esifushane noma ukuhogela ingcuphe ye-carcinogenic.
Ngo-April 2019, i-European Committee for Standardization (CEN) yakhipha izinga lokuphepha kwamathoyizi EN71 Ingxenye 3: ukufuduka kwezinto ezithile (inguqulo ka-2019).Phakathi kwazo, okuqukethwe okubuyekeziwe kokutholwa kwe-Cr(VI) kuthi:
● inani elilinganiselwe le-Cr (VI) lohlobo lwesithathu lwezinto ezibonakalayo, lishintshile ukusuka ku-0.2mg/kg laya ku-0.053mg/kg, liqala ukusebenza ngomhla ka-Novemba 18, 2019.
● indlela yokuhlola ye-Cr (VI) isibuyekeziwe, futhi indlela ebuyekeziwe isingakwazi kakade ukuqukatha umkhawulo wazo zonke izigaba zezinto.Indlela yokuhlola ishintshile ukusuka ku-LC-ICPMS ukuya ku-IC-ICPMS.
SHINE izixazululo zochwepheshe
Ngokwezinga le-EN71-3:2019 le-European Union, ukuhlukaniswa nokutholwa kwe-Cr (III) kanye ne-Cr (VI) kumathoyizi kungenziwa kusetshenziswa i-SINE CIC-D120 ion chromatograph kanye ne-NCS plasma MS 300 inductively ehlanganiswe i-plasma mass spectrometer.Isikhathi sokutholwa singaphakathi kwamasekhondi angu-120, futhi ubudlelwano bomugqa buhle.Ngaphansi kwesimo somjovo we-Cr (III) kanye ne-Cr (VI), imikhawulo yokuthola i-5ng / L kanye ne-6ng / L ngokulandelana, futhi ukuzwela kuhlangabezana nezidingo zomkhawulo wokutholwa okujwayelekile.
1. Ukucushwa kwensimbi
2. Izimo zokutholwa
Isimo se-ion chromatograph
Isigaba seselula: 70 mM NH4NO3, 0.6 mM EDTA(2Na), pH 71 , Imodi ye-Elution: I-Isometric elution
Izinga lokugeleza (mL / min): 1.0
Ivolumu yomjovo (µL):200
Ikholomu: AG 7
Isimo se-ICP-MS
Amandla e-RF (W) :1380
Igesi yenkampani yenethiwekhi (L/min) :0.97
Inombolo yokuhlaziya: 52C
Amandla kagesi amaningi (V): 2860
Ubude besikhathi (s) :150
3. Ama-reagents kanye nezixazululo ezijwayelekile
Isixazululo esijwayelekile se-Cr (III) kanye ne-Cr (VI): isixazululo esijwayelekile esitholakala ngokuthengisa
I-ammonia egxilile: okuhlanzekile okuphezulu
I-nitric acid egxilile: ubumsulwa obuphakeme
I-EDTA-2Na: ubumsulwa obuphakeme
Amanzi ahlanzekile kakhulu: ukumelana ≥ 18.25 m Ω· cm (25 ℃).
Ukulungiswa kwe-Cr(VI) ijika elisebenzayo: nciphisa isixazululo esijwayelekile se-Cr(VI) ngamanzi ahlanzekile kakhulu ukuya esinyathelweni sokugxilisa esidingekayo ngesinyathelo.
Ukulungiswa kwejika lokusebenza lesixazululo esixubile se-Cr (III) ne-Cr (VI): thatha inani elithile lesisombululo esijwayelekile se-Cr (III) ne-Cr (VI), engeza u-10mL ka-40mM EDTA-2Na eflaskni yevolumu engu-50mL, lungisa inani le-pH. ukuya cishe ku-7.1, yishise emanzini okugeza angu-70 ℃ i-15min, lungisa ivolumu, futhi wenze isisombululo esivamile esixutshwe nokugxila okudingekayo ngendlela efanayo.
4. Umphumela wokutholwa
Ngokuhambisana nendlela yokuhlola enconyiwe ye-EN71-3, i-Cr (III) yahlanganiswa ne-EDTA-2Na, futhi i-Cr(III) ne-Cr(VI) yahlukaniswa ngempumelelo.I-chromatogram yesampula ngemva kokuphindaphinda okuthathu ibonise ukuthi ukukhiqizwa kabusha bekukuhle, futhi ukuchezuka okujwayelekile okuhlobene (i-RSD) kwendawo ephakeme kakhulu bekungaphansi kuka-3%.Umkhawulo wokutholwa unqunywe ukugxila kwe-S/N>3.Umkhawulo wokutholwa wawungu-6ng/L.
I-chromatogram yokuhlukaniswa komjovo ye-Cr (III) - EDTA ne-Cr(VI) isisombululo esixubile
Imbondela yeChromatogram yokuhlolwa okuthathu komjovo we-0.1ug/L Cr (III)-EDTA kanye nesixazululo esixubile se-Cr(VI)(Ukuzinza kwesampula engu-0.1ppbCr (III) + Cr (VI))
0.005-1.000 ug/L Cr (III) ijika lokulinganisa(isampula yendawo ephakeme)
0.005-1.000 ug/L Cr (VI) ijika lokulinganisa(Umugqa wobude obuphakeme)isampuli ye-ea linearity)
Isikhathi sokuthumela: Apr-18-2023