Nsogbu ezoro ezo na ihe egwuregwu ụmụaka
Chromium bụ metal multivalent, nke a na-ahụkarị bụ Cr (III) na Cr (VI).N'ime ha, nsi nke Cr (VI) karịrị 100 ugboro nke Cr (III), nke nwere mmetụta dị ukwuu n'ahụ mmadụ, anụmanụ na ihe ndị dị ndụ n'ime mmiri.Edepụtara ya dị ka klas I carcinogen site n'aka ụlọ ọrụ mba ụwa maka nyocha ọrịa kansa (IARC).Mana ọtụtụ ndị amaghị na enwere nsogbu nke oke Cr (VI) n'ihe egwuregwu ụmụaka!
Cr (VI) dị mfe nke ahụ mmadụ.Ọ nwere ike ịwakpo ahụ mmadụ site na mgbaze, akụkụ iku ume, akpụkpọ ahụ na akpụkpọ anụ mucous.A kọwo na mgbe ndị mmadụ na-ekuku ikuku nke nwere ọkwa dị iche iche nke Cr (VI), ha ga-enwe ogo dị iche iche nke ụda olu, atrophy nke mucosa imi, na ọbụna perforation nke septum imi na bronchiectasis.Ọ nwere ike ịkpata vomiting na mgbu afọ.Dermatitis na eczema nwere ike ime site na mbuso agha akpụkpọ ahụ.Nke kachasị emerụ ahụ bụ ikpughe ogologo oge ma ọ bụ obere oge ma ọ bụ iku ume nke ihe egwu carcinogenic.
N'April 2019, Kọmitii European maka Standardization (CEN) wepụtara ọkọlọtọ nchekwa ụmụaka EN71 Nkebi 3: Mbugharị nke ihe ndị akọwapụtara (ụdị 2019).N'ime ha, ọdịnaya edegharịrị maka nchọpụta Cr(VI) bụ:
● uru oke nke Cr (VI) nke ụdị ihe nke atọ, gbanwere site na 0.2mg/kg ruo 0.053mg/kg, dị irè na Nọvemba 18, 2019.
● E degharịala usoro nnwale nke Cr (VI), na usoro edegharịrị nwere ike ịnwe oke nke ụdị ngwa niile.Usoro ule gbanwere site na LC-ICPMS gaa na IC-ICPMS.
SHINE ngwọta ọkachamara
Dabere na ọkọlọtọ EN71-3: 2019 nke European Union, nkewa na nchọpụta nke Cr (III) na Cr (VI) n'ime ihe egwuregwu ụmụaka nwere ike mezuo site na iji SINE CIC-D120 ion chromatograph na NCS plasma MS 300 inductively jikọtara ọnụ plasma mass spectrometer.Oge nchọta dị n'ime 120 sekọnd, yana njikọ ahịrị dị mma.N'okpuru ọnọdụ injection nke Cr (III) na Cr (VI), njedebe nchọpụta bụ 5ng / L na 6ng / L n'otu n'otu, na uche na-emezu ihe achọrọ oke nchọpụta.
1. Nhazi akụrụngwa
2. Ọnọdụ nchọpụta
Ion chromatograph ọnọdụ
Usoro mkpanaaka: 70 mM NH4NO3, 0.6 mM EDTA(2Na), pH 71 , Elution mode: Isometric elution
Ọnụego mgbaba (ml/min): 1.0
Olu igba ogwu (µL):200
Ogidi: AG 7
Ọnọdụ ICP-MS
RF ike (W): 1380
Igwe ọkụ na-ebu (L/min): 0.97
Ọnụ ọgụgụ nyocha:52C
Multiplier voltaji (V): 2860
Ogologo oge (s) :150
3. Reagents na ọkọlọtọ ngwọta
Ngwọta ọkọlọtọ Cr (III) na Cr (VI): ngwọta ọkọlọtọ enwetara azụmaahịa dị
Amonia gbadoro anya: dị ọcha karịa
Nitric acid gbadoro anya: ịdị ọcha dị elu
EDTA-2Na: ịdị ọcha dị elu
Mmiri dị ọcha Ultra: resistivity ≥ 18.25 m Ω · cm (25 ℃).
Nkwadebe nke Cr (VI) na-arụ ọrụ usoro: gbanye ụkpụrụ ọkọlọtọ Cr (VI) na mmiri ultra dị ọcha na ntinye uche achọrọ site na nzọụkwụ.
Nkwadebe nke Cr (III) na Cr (VI) ngwakọta ngwọta na-arụ ọrụ usoro: were ụfọdụ Cr (III) na Cr (VI) ọkọlọtọ ngwọta, tinye 10mL nke 40mM EDTA-2Na n'ime 50mL volumetric flask, mezie pH uru. ihe dị ka 7.1, kpoo ya na mmiri ịsa mmiri na 70 ℃ maka 15min, dozie olu, ma mee ka ngwọta agwakọta ọkọlọtọ na ntinye uche achọrọ site n'otu usoro ahụ.
4. Nchọpụta nchọpụta
N'ikwekọ na usoro nnwale EN71-3 akwadoro, ejiri EDTA-2Na gbajuo Cr (III), na Cr (III) na Cr (VI) kewapụrụ nke ọma.Ihe chromatogram nke ihe nlele ahụ mgbe ugboro atọ gasịrị gosipụtara na mmeghari ahụ dị mma, na nkwụsịtụ ọkọlọtọ (RSD) nke mpaghara kachasị elu bụ ihe na-erughị 3%. Achọpụtara njedebe nchọpụta site na ntinye nke S / N> 3.Oke nchọpụta bụ 6ng/L.
chromatogram nkewa nkewa nke Cr (III) - EDTA na Cr (VI) ngwọta agwakọta
Chromatogram machie nke nnwale injection atọ nke 0.1ug/L Cr (III) -EDTA na Cr (VI) ngwọta agwakọta (Stability of 0.1ppbCr (III) + Cr (VI) sample)
0.005-1.000 ug/L Cr (III) usoro nhazi nhazi (oke mpaghara linearity) sample)
0.005-1.000 ug/L Cr (VI) usoro nhazi nhazi (oke elu elu linearity) ea linearity) sample)
Oge nzipu: Eprel-18-2023