Latent dambudziko mumatoyi
Chromium isimbi ine multivalent, iyo inonyanya kuzivikanwa ndeye Cr (III) uye Cr (VI).Pakati pavo, huturu hweCr (VI) hunopfuura ka100 nguva yeCr (III), iyo ine muchetura wakakura kwazvo pavanhu, mhuka uye zvipenyu zvemumvura.Yakanyorwa sekirasi I carcinogen nesangano repasi rose rekutsvaga cancer (IARC).Asi vanhu vazhinji havazivi kuti kune dambudziko rekuwandisa Cr (VI) mumatoyi evana!
Cr (VI) iri nyore kwazvo kutorwa nemuviri wemunhu.Inogona kupinda mumuviri wemunhu kuburikidza nekugaya, kufema, ganda uye mucous membrane.Zvinonzi kana vanhu vachifema mhepo ine zvikamu zvakasiyana-siyana zveCr (VI), vanozove nemhando dzakasiyana dzehoarseness, atrophy ye nasal mucosa, uye kunyange perforation ye nasal septum uye bronchiectasis.Inogona kukonzera kurutsa uye kurwadziwa mudumbu.Dermatitis uye eczema zvinogona kuitika kuburikidza nekupinda kweganda.Chinonyanya kukuvadza ndechekugara kwenguva refu kana pfupi-pfupi kana kufema kwengozi yecarcinogenic.
Muna Kubvumbi 2019, European Committee for Standardization (CEN) yakapa chiyero chekuchengetedza toy EN71 Chikamu 3: kutama kwezvinhu zvakanangana (2019 vhezheni).Pakati pavo, iyo yakagadziridzwa yemukati yeCr(VI) yekuona ndeiyi:
● kukosha kwemuganho weCr (VI) yemhando yechitatu yezvinhu, yakashandurwa kubva pa0.2mg/kg kuenda pa0.053mg/kg, inoshanda munaNovember 18, 2019.
● nzira yekuedza yeCr (VI) yakadzokororwa, uye nzira yakadzokororwa inogona kunge iine muganhu wezvikamu zvose zvezvinhu.Nzira yekuedza yakashandurwa kubva kuLC-ICPMS kuenda kuIC-ICPMS.
SHINE nyanzvi mhinduro
Zvinoenderana ne EN71-3: 2019 chiyero cheEuropean Union, kupatsanurwa uye kuonekwa kweCr (III) uye Cr (VI) mumatoyi kunogona kuwanikwa nekushandisa SINE CIC-D120 ion chromatograph uye NCS plasma MS 300 inductively yakabatana plasma mass spectrometer.Nguva yekuona iri mukati me120 seconds, uye hukama hwemutsara hwakanaka.Pasi pemamiriro ejekiseni yeCr (III) uye Cr (VI), miganho yekuona ndeye 5ng / L uye 6ng / L zvakateerana, uye senitivity inosangana neyakajairwa yekuona muganho zvinodiwa.
1. Instrument configuration
2. Mamiriro ekuona
Ion chromatograph mamiriro
Nharembozha chikamu: 70 mM NH4NO3, 0.6 mM EDTA(2Na), pH 71 , Elution mode: Isometric elution
Mwero wekuyerera (mL / min): 1.0
Jekiseni vhoriyamu (µL):200
Chikamu: AG 7
ICP-MS mamiriro
RF simba (W) :1380
Mutakuri wegasi (L/min) :0.97
Kuongorora kuwanda nhamba: 52C
Multiplier voltage (V) :2860
Nguva (s) :150
3. Reagents uye yakajairwa mhinduro
Cr (III) uye Cr (VI) yakajairwa mhinduro: inotengeswa yakasimbiswa yakagadziriswa mhinduro
Yakaiswa ammonia: yepamusoro yakachena
Yakaiswa nitric acid: kuchena kwepamusoro
EDTA-2Na: kuchena kwepamusoro
Ultra yakachena mvura: resistivity ≥ 18.25 m Ω· cm (25 ℃).
Kugadzirira kweCr (VI) yekushanda curve: dilute Cr (VI) yakajairwa mhinduro ine yakanyanya kuchena mvura kune inodiwa yekusimbisa nhanho nhanho.
Kugadzirira kweCr (III) uye Cr (VI) yakasanganiswa mhinduro inoshanda curve: tora imwe huwandu hweCr (III) uye Cr (VI) yakajairwa mhinduro, wedzera 10mL ye40mM EDTA-2Na mu50mL volumetric flask, gadzirisa pH kukosha. kusvika ku7.1, zvipise mumvura yekugezera pa70 ℃ kwe15min, gadzirisa vhoriyamu, uye ita chiyero chakavhenganiswa chekugadzirisa nekugadzirisa kunodiwa nenzira imwechete.
4. Detection result
Zvinoenderana neyakakurudzirwa nzira yekuyedza ye EN71-3, Cr (III) yakasanganiswa neEDTA-2Na, uye Cr (III) uye Cr (VI) zvakapatsanurwa zvinobudirira.Iyo chromatogram yemuenzaniso mushure mekudzokorora katatu yakaratidza kuti kuberekana kwaive kwakanaka, uye chiyero chekuenzanisa (RSD) chepamusoro-soro chepamusoro chakanga chiri pasi pe3%.Muganho wekuona waive 6ng/L.
Jekiseni kupatsanura chromatogram yeCr (III) - EDTA uye Cr(VI) yakasanganiswa mhinduro
Chromatogram yakafukidzirwa yemajekiseni matatu ekuedzwa kwe0.1ug/L Cr (III)-EDTA uye Cr(VI) yakasanganiswa mhinduro (Kugadzikana kwe0.1ppbCr (III) + Cr (VI) sampuli)
0.005-1.000 ug/L Cr (III) calibration curve(Peak area linearity) muenzaniso)
0.005-1.000 ug/L Cr (VI) calibration curve(Peak height linearity)ea linearity) muenzaniso)
Nguva yekutumira: Kubvumbi-18-2023