Ingxaki efihlakeleyo kwizinto zokudlala
I-Chromium yintsimbi eninzi, eyona nto ixhaphakileyo yiCr (III) kunye neCr (VI).Phakathi kwabo, i-toxicity ye-Cr (VI) ingaphezulu kwamaxesha e-100 ye-Cr (III), enempembelelo enkulu kakhulu enetyhefu kubantu, izilwanyana kunye nezinto eziphilayo zasemanzini.Idweliswe njengeklasi ye-carcinogen yi-arhente yamazwe ngamazwe yophando lomhlaza (IARC).Kodwa abantu abaninzi abazi ukuba kukho ingxaki yeCr (VI) egqithisileyo kwizinto zokudlala zabantwana!
I-Cr (VI) kulula kakhulu ukufunxwa ngumzimba womntu.Inokuhlasela umzimba womntu ngokugaya, umgudu wokuphefumla, ulusu kunye nenwebu ye-mucous.Kuye kwaxelwa ukuba xa abantu bephefumla umoya oqulethe imilinganiselo eyahlukeneyo ye-Cr (VI), baya kuba namaqondo ahlukeneyo okukhwaza, i-atrophy ye-mucosa yeempumlo, kunye nokugqobhozwa kwe-septum ye-nasal kunye ne-bronchiectasis.Inokubangela ukugabha kunye neentlungu zesisu.I-Dermatitis kunye ne-eczema ingenzeka ngokuhlaselwa kwesikhumba.Okona kuyingozi kakhulu kukuvezwa kwexesha elide okanye elifutshane okanye ukuphefumla umngcipheko wecarcinogenic.
Ngo-Epreli ka-2019, i-European Committee for Standardization (CEN) ikhuphe umgangatho wokhuseleko wethoyi EN71 Icandelo 3: ukufuduka kwezinto ezithile (uguqulelo luka-2019).Phakathi kwazo, umxholo ohlaziyiweyo wokubhaqwa kwe-Cr(VI) ngulo:
● ixabiso elilinganiselweyo le-Cr (VI) lohlobo lwesithathu lwezinto eziphathekayo, lutshintshile ukusuka kwi-0.2mg/kg ukuya kwi-0.053mg/kg, ukusebenza ngoNovemba 18, 2019.
● indlela yokuvavanya ye-Cr (VI) ihlaziywe, kwaye indlela ehlaziyiweyo ingaba sele iqulethe umda wazo zonke iindidi zezinto.Indlela yovavanyo itshintshiwe ukusuka kwi-LC-ICPMS ukuya kwi-IC-ICPMS.
SHINE izisombululo zobungcali
Ngokutsho kwe-EN71-3: umgangatho we-2019 we-European Union, ukwahlukana kunye nokufunyanwa kwe-Cr (III) kunye ne-Cr (VI) kwizinto zokudlala zinokuqondwa ngokusebenzisa i-SINE CIC-D120 ion chromatograph kunye ne-NCS plasma MS 300 inductively idibene ne-plasma mass spectrometer.Ixesha lokufumanisa lingaphakathi kwemizuzwana ye-120, kwaye ubudlelwane bomgca bulungile.Ngaphantsi kwemeko ye-injection ye-Cr (III) kunye ne-Cr (VI), imida yokubona i-5ng / L kunye ne-6ng / L ngokulandelanayo, kwaye uvakalelo luhlangabezana neemfuno zomda wokubona umgangatho.
1. Ubumbeko lwesixhobo
2. Iimeko zokufunyanwa
I-ion chromatograph imeko
Isigaba seselula: 70 mM NH4NO3, 0.6 mM EDTA(2Na), pH 71 , Imo ye-Elution: I-Isometric elution
Isantya sokuhamba (mL / min): 1.0
Umthamo wokutofa (µL):200
Umqolo: AG 7
Imeko ye-ICP-MS
Amandla eRF (W): 1380
Irhasi yokuthwala (L/min) :0.97
Inani lobunzima bohlalutyo: 52C
Umbane ophindaphindayo (V) :2860
Ubude bexesha (s) :150
3. Iireagents kunye nezisombululo eziqhelekileyo
I-Cr (III) kunye ne-Cr (VI) isisombululo esisemgangathweni: isisombululo esisemgangathweni esiqinisekisiweyo sorhwebo
I-ammonia egxininisiweyo: icocekileyo ephezulu
I-nitric acid egxininisiweyo: ubunyulu obuphezulu
EDTA-2Na: ubunyulu obuphezulu
Amanzi acocekileyo kakhulu: ukuxhathisa ≥ 18.25 m Ω· cm (25 ℃).
Ukulungiswa kwe-Cr (VI) i-curve yokusebenza: dilute i-Cr (VI) isisombululo esisemgangathweni kunye namanzi acocekileyo e-ultra ukuya kwinqanaba elifunekayo lokugxininiswa ngesinyathelo.
Ukulungiswa kwe-Cr (III) kunye ne-Cr (VI) isisombululo esixubileyo se-curve yokusebenza: thatha inani elithile le-Cr (III) kunye ne-Cr (VI) isisombululo esiqhelekileyo, yongeza i-10mL ye-40mM EDTA-2Na kwi-flask ye-volumetric ye-50mL, lungisa ixabiso le-pH. ukuya malunga ne-7.1, yifudumeze kwindawo yokuhlambela amanzi kwi-70 ℃ ye-15min, lungisa umthamo, kwaye wenze isisombululo esiqhelekileyo esixutywe kunye noxinzelelo olufunekayo ngendlela efanayo.
4. Iziphumo zokufunyanwa
Ngokuhambelana nenkqubo yovavanyo ecetyiswayo ye-EN71-3, i-Cr (III) yaxutywa kunye ne-EDTA-2Na, kunye ne-Cr (III) kunye ne-Cr (VI) yahlulwe ngokufanelekileyo.I-chromatogram yesampuli emva kokuphindaphinda kathathu ibonise ukuba ukuphindaphinda kwakulungile, kwaye ukuphambuka komgangatho ohambelanayo (RSD) wendawo ephakamileyo yayingaphantsi kwe-3%.Umda wokubona wawuyi-6ng/L.
Isitofu sokwahlula ichromatogram ye-Cr (III) - EDTA kunye ne-Cr(VI) isisombululo esixubileyo
Ukwaleka kweChromatogram yeemvavanyo ezintathu zenaliti ye-0.1ug / L Cr (III)-EDTA kunye ne-Cr (VI) isisombululo esixubileyo (Ukuzinza kwe-0.1ppbCr (III) + Cr (VI) isampuli)
0.005-1.000 ug/L Cr (III) igophe lokulinganisa (iSampulu yomgca wendawo)
0.005-1.000 ug/L Cr (VI) igophe lolungelelaniso(Incopho yobude bomgca)ea linearity) isampulu)
Ixesha lokuposa: Apr-18-2023