Tlokotsi e patehileng linthong tsa ho bapala
Chromium ke tšepe e ngata, e tloaelehileng ka ho fetisisa ke Cr (III) le Cr (VI).Har'a bona, chefo ea Cr (VI) ke makhetlo a fetang 100 a Cr (III), e nang le phello e chefo e kholo ho batho, liphoofolo le lintho tse phelang metsing.E thathamisitsoe e le carcinogen ea sehlopha sa I ke mokhatlo oa machaba oa lipatlisiso tsa kankere (IARC).Empa batho ba bangata ha ba tsebe hore ho na le bothata ba Cr (VI) e feteletseng lipapaling tsa bana!
Cr (VI) e bonolo haholo ho monngoa ke 'mele oa motho.E ka hlasela 'mele oa motho ka tšilo ea lijo, mokhoa oa ho hema, letlalo le lera la mucous.Ho tlalehiloe hore ha batho ba hema moea o nang le likarolo tse fapaneng tsa Cr (VI), ba tla ba le likhato tse sa tšoaneng tsa hoarseness, atrophy ea nasal mucosa, esita le ho phunyeha ha nasal septum le bronchiectasis.E ka baka ho hlatsa le mahlaba ka mpeng.Dermatitis le eczema li ka hlaha ka lebaka la tlhaselo ea letlalo.Ntho e kotsi ka ho fetisisa ke ho pepeseha ha nako e telele kapa nako e khuts'oane kapa ho hema ka matla a kotsi ea kankere.
Ka Mmesa 2019, Komiti ea Tekanyetso ea Europe (CEN) e ile ea fana ka tekanyetso ea polokeho ea toy EN71 Karolo ea 3: phallo ea likarolo tse itseng (mofuta oa 2019).Har'a tsona, litaba tse ntlafalitsoeng bakeng sa tlhahlobo ea Cr(VI) ke:
● boleng bo lekanyelitsoeng ba Cr (VI) ba mofuta oa boraro oa thepa, bo fetotsoe ho tloha ho 0.2mg/kg ho ea ho 0.053mg/kg, ho sebetsa ka la 18 Pulungoana 2019.
● mokhoa oa teko oa Cr (VI) o ntlafalitsoe, 'me mokhoa o ntlafalitsoeng o ka se o ntse o e-na le moeli oa lihlopha tsohle tsa thepa.Mokhoa oa teko o fetotsoe ho tloha ho LC-ICPMS ho ea ho IC-ICPMS.
SHINE litharollo tsa litsebi
Ho latela EN71-3: 2019 standard ea European Union, karohano le ho lemoha Cr (III) le Cr (VI) linthong tsa ho bapala li ka bonoa ka ho sebelisa SINE CIC-D120 ion chromatograph le NCS plasma MS 300 inductively colated plasma mass spectrometer.Nako ea ho lemoha e ka hare ho metsotsoana e 120, 'me kamano ea mohala e ntle.Tlas'a boemo ba ente ea Cr (III) le Cr (VI), meeli ea ho lemoha ke 5ng / L le 6ng / L ka ho latellana, 'me kutlo e kopana le litlhoko tse tloaelehileng tsa ho lemoha.
1. Tlhophiso ea seletsa
2. Maemo a ho lemoha
Boemo ba chromatograph ea Ion
Mokhahlelo oa selefouno: 70 mM NH4NO3, 0.6 mM EDTA(2Na), pH 71 , Mokhoa oa ho hlakisa: elution ea Isometric
Sekhahla sa phallo (mL / min): 1.0
Bophahamo ba ente (µL):200
Kholomo: AG 7
Boemo ba ICP-MS
RF matla (W) :1380
Khase e tsamaisang thepa (L/min) :0.97
Palo ea boima ba tlhahlobo: 52C
Matla a mangata (V): 2860
Nako (s) :150
3. Li-reagents le litharollo tse tloaelehileng
Cr (III) le Cr (VI) tharollo e tloaelehileng: tharollo e fumanehang khoebong e netefalitsoeng
Ammonia e tsitsitseng: e hloekileng ka ho fetisisa
Nitric acid e tsepamisitsoeng: bohloeki bo phahameng
EDTA-2Na: bohloeki bo phahameng
Metsi a hloekileng haholo: resistivity ≥ 18.25 m Ω· cm (25 ℃).
Ho lokisoa ha Cr(VI) curve e sebetsang: hlapolla tharollo e tloaelehileng ea Cr(VI) ka metsi a hloekileng haholo ho isa tekanyong e hlokahalang mohato ka mohato.
Ho lokisoa ha Cr (III) le Cr (VI) motsoako oa tharollo e sebetsang ea curve: nka tekanyo e itseng ea Cr (III) le Cr (VI) tharollo e tloaelehileng, eketsa 10mL ea 40mM EDTA-2Na ka har'a flask ea volumetric ea 50mL, fetola boleng ba pH. ho ea ho hoo e ka bang 7.1, e chese ka bateng ea metsi ka 70 ℃ bakeng sa 15min, lokisa molumo, 'me u etse tharollo e tloaelehileng e tsoakiloeng le mahloriso a hlokahalang ka mokhoa o ts'oanang.
4. Sephetho sa ho lemoha
Ho latela mokhoa o khothaletsoang oa liteko oa EN71-3, Cr (III) e entsoe ka EDTA-2Na, 'me Cr(III) le Cr(VI) li ne li arohane ka katleho.Chromatogram ea sampuli ka mor'a ho pheta-pheta ka makhetlo a mararo e bontšitse hore ho ikatisa ho ne ho le molemo, 'me ho kheloha ha maemo ho lekanyelitsoeng (RSD) ea sebaka sa tlhōrō e ne e le ka tlase ho 3%.Moeli oa ho lemoha o ne o khethoa ke khatello ea S / N> 3.Tekanyo ea ho lemoha e ne e le 6ng/L.
chromatogram ea karohano ea ente ea Cr (III) - EDTA le Cr(VI) tharollo e tsoakiloeng
Chromatogram e koahelang liteko tse tharo tsa ente ea 0.1ug / L Cr (III)-EDTA le Cr (VI) motsoako oa tharollo (Botsitso ba 0.1ppbCr (III) + Cr (VI) sampuli)
0.005-1.000 ug/L Cr (III) curve calibration curve(Peak area linearity) sampole)
0.005-1.000 ug/L Cr (VI) curve calibration curve(Peak height linearity)ea linearity)
Nako ea poso: Apr-18-2023