Zobisika zovuta zoseweretsa
Chromium ndi chitsulo chochuluka, chofala kwambiri ndi Cr (III) ndi Cr (VI).Pakati pawo, kawopsedwe ka Cr (VI) ndi nthawi yopitilira 100 ya Cr (III), yomwe imakhala ndi poizoni wambiri pa anthu, nyama ndi zamoyo zam'madzi.Idalembedwa ngati carcinogen ya kalasi yoyamba ndi International Agency for Cancer Research (IARC).Koma anthu ambiri sadziwa kuti pali vuto la kuchuluka kwa Cr (VI) muzoseweretsa za ana!
Cr (VI) ndiyosavuta kutengeka ndi thupi la munthu.Imatha kulowa m'thupi la munthu kudzera m'chimbudzi, kupuma, khungu ndi mucous nembanemba.Akuti anthu akamapuma mpweya wokhala ndi Cr (VI) wosiyanasiyana, amakhala ndi milingo yosiyanasiyana ya hoarseness, atrophy of nasal mucosa, komanso kuphulika kwa nasal septum ndi bronchiectasis.Zingayambitse kusanza ndi kupweteka m'mimba.Dermatitis ndi eczema zimatha kuchitika chifukwa cha kuukira kwa khungu.Choyipa kwambiri ndi kukhala pachiwopsezo kwakanthawi kochepa kapena kwakanthawi kochepa kapena kupuma movutikira.
Mu Epulo 2019, European Committee for Standardization (CEN) idapereka mulingo wachitetezo cha chidole EN71 Gawo 3: kusamuka kwazinthu zinazake (mtundu wa 2019).Zina mwa izo, zomwe zasinthidwanso za Cr(VI) ndi:
● malire a Cr (VI) amtundu wachitatu wazinthu, zosinthidwa kuchoka pa 0.2mg/kg kufika pa 0.053mg/kg, kuyambira pa Novembara 18, 2019.
● njira yoyesera ya Cr (VI) yasinthidwa, ndipo njira yosinthidwa ikhoza kukhala ndi malire a magulu onse a zipangizo.Njira yoyesera idasinthidwa kuchoka ku LC-ICPMS kupita ku IC-ICPMS.
SHINE mayankho akatswiri
Malinga ndi EN71-3: 2019 muyezo wa European Union, kulekanitsa ndi kuzindikira Cr (III) ndi Cr (VI) mu zoseweretsa zitha kuzindikirika pogwiritsa ntchito SINE CIC-D120 ion chromatograph ndi NCS plasma MS 300 inductively plasma mass spectrometer.Nthawi yodziwikiratu ili mkati mwa masekondi 120, ndipo ubale wa mzere ndi wabwino.Pansi pa jakisoni wa Cr (III) ndi Cr (VI), malire odziwikiratu ndi 5ng / L ndi 6ng / L motsatana, ndipo kukhudzika kumakwaniritsa zofunikira zowunikira.
1. Kusintha kwa chida
2. Zodziwika
Chikhalidwe cha ion chromatograph
Gawo lam'manja: 70 mM NH4NO3, 0.6 mM EDTA(2Na), pH 71 , Elution mode: Isometric elution
Kuthamanga (mL / min): 1.0
Kuchuluka kwa jakisoni (µL): 200
Gawo: AG7
Chikhalidwe cha ICP-MS
RF mphamvu (W) : 1380
Gasi Wonyamula (L/mphindi) :0.97
Chiwerengero cha misala: 52C
Magetsi ochulukitsa (V): 2860
Nthawi (s):150
3. Reagents ndi muyezo zothetsera
Cr (III) ndi Cr (VI) yankho lokhazikika: yankho lovomerezeka lopezeka pamalonda
Ammonia yokhazikika: yoyera kwambiri
Kukhazikika kwa nitric acid: chiyero chapamwamba
EDTA-2Na: chiyero chapamwamba
Madzi oyera kwambiri: resistivity ≥ 18.25 m Ω· cm (25 ℃).
Kukonzekera kwa Cr(VI) curve yogwira ntchito: chepetsani njira yokhazikika ya Cr(VI) ndi madzi oyera kwambiri mpaka pamlingo wofunikira pang'onopang'ono.
Kukonzekera kwa Cr (III) ndi Cr (VI) njira yosakanikirana yopangira njira: tengani njira yokhazikika ya Cr (III) ndi Cr (VI), onjezani 10mL ya 40mM EDTA-2Na mu botolo la volumetric 50mL, sinthani pH mtengo. pafupifupi 7.1, tenthetsani mu osamba madzi 70 ℃ kwa 15min, kukonza voliyumu, ndi kupanga muyezo wosanganiza njira ndi ndende chofunika ndi njira yomweyo.
4. Chotsatira
Mogwirizana ndi njira yoyesera yoyeserera ya EN71-3, Cr (III) idapangidwa ndi EDTA-2Na, ndipo Cr(III) ndi Cr(VI) idasiyanitsidwa bwino.Chromatogram ya chitsanzo pambuyo pa kubwereza katatu inasonyeza kuti kuberekana kunali kwabwino, ndipo kusiyana kwapakati (RSD) kwa malo apamwamba kunali kochepa kuposa 3%.Malire ozindikira anali 6ng/L.
Jekeseni kupatukana chromatogram ya Cr (III) - EDTA ndi Cr(VI) osakaniza njira
Kuphimba kwa Chromatogram kwa mayeso atatu a jakisoni a 0.1ug/L Cr (III)-EDTA ndi Cr(VI) mix solution (Kukhazikika kwa 0.1ppbCr (III) + Cr (VI) chitsanzo)
0.005-1.000 ug/L Cr (III) curve calibration(Peak area linearity)
0.005-1.000 ug/L Cr (VI) curve calibration(Peak height linearity)ea linearity)
Nthawi yotumiza: Apr-18-2023