Separation and preconcentration of Cr(VI) as ion associate using solid phase extraction
OTRUBA, Vítězslav, Jan PIVNIČKA a Viktor KANICKÝ. Separation and preconcentration of Cr(VI) as ion associate using solid phase extraction. Collection of Czechoslovak Chemical Communications. Prague: IOCB, 2000, roč. 65, č. 12, s. 1865-1874. ISSN 0010-0765. |
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Základní údaje | |
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Originální název | Separation and preconcentration of Cr(VI) as ion associate using solid phase extraction |
Autoři | OTRUBA, Vítězslav (203 Česká republika), Jan PIVNIČKA (203 Česká republika) a Viktor KANICKÝ (203 Česká republika, garant). |
Vydání | Collection of Czechoslovak Chemical Communications, Prague, IOCB, 2000, 0010-0765. |
Další údaje | |
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Originální jazyk | angličtina |
Typ výsledku | Článek v odborném periodiku |
Obor | 10406 Analytical chemistry |
Stát vydavatele | Česká republika |
Utajení | není předmětem státního či obchodního tajemství |
Impakt faktor | Impact factor: 0.960 |
Kód RIV | RIV/00216224:14310/00:00002852 |
Organizační jednotka | Přírodovědecká fakulta |
UT WoS | 000167546600004 |
Klíčová slova anglicky | Hexavalent chromium; solid phase extraction; ion associate; flame emission spectrometry |
Štítky | flame emission spectrometry, Hexavalent chromium, Ion associate, Solid Phase Extraction |
Příznaky | Recenzováno |
Změnil | Změnil: prof. RNDr. Viktor Kanický, DrSc., učo 408. Změněno: 29. 6. 2007 10:19. |
Anotace |
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Cr(VI) was preconcentrated as ion associate of chromate with quaternary onium salts on C18 modified silicagel.After elution with ethanol, Cr was determined by flame emission spectrometry. |
Anotace česky |
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A method of separation and preconcentration of Cr(VI) was developed based on sorption on modified silica gel (C18) of an ion associate of Cr(VI) anion with a quaternary base. The study was performed with the following quaternary onium salts: [1-(ethoxycarbonyl)-pentadecyl]trimethylammonium bromide, 1-hexadecylpyridinium chloride, benzyl(dodecyl)dimethylammonium bromide, butyl(triphenyl)phosphonium bromide and tetraphenylarsonium chloride. Benzyl(dodecyl)dimethylammonium bromide was found the optimum ion-pairing reagent. Sample containing Cr(III) and Cr(VI) in the presence of 0.005 mol/l of benzyl(dodecyl)dimethylammonium bromide was pumped with a peristaltic pump through the column containing the sorbent. The optimum pH range 4-5 was maintained with 0.05 mol/l phosphate buffer. Elution was accomplished using 95 vol.% ethanol and the recovery of Cr(VI) was (96 +/- 6)% in the concentration range 0.005-1 mg/l of Cr(VI); even in a tenfold excess of Cr(III) the recovery of Cr(VI) was 99.8% with the relative standard deviation of repeatability about 2.4% Cr in the eluate was determined by emission flame spectrometry (Cr I 425.435 nm) in an air-acetylene or N2O-acetylene flame with the limits of detection 10 or 2 ng/ml, respectively. Hence, with a typical preconcentration factor of 200, the limits of detection in natural aqueous samples were 50 and 10 pg/ml, respectively. Calibrations were linear at least up to 10 mg/l. |
Návaznosti | |
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VS97020, projekt VaV | Název: Laboratoř plazmových zdrojů pro chemickou analýzu |
Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Laboratoř plazmových zdrojů pro chemickou analýzu |
VytisknoutZobrazeno: 9. 10. 2024 23:12