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.

Základní údaje

• 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

• 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

Anotace

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

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

• VS97020, projekt VaV: Název: Laboratoř plazmových zdrojů pro chemickou analýzu

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Laboratoř plazmových zdrojů pro chemickou analýzu