2000
Separation and preconcentration of Cr(VI) as ion associate using solid phase extraction
OTRUBA, Vítězslav; Jan PIVNIČKA a Viktor KANICKÝZákladní údaje
Originální název
Separation and preconcentration of Cr(VI) as ion associate using solid phase extraction
Autoři
OTRUBA, Vítězslav; Jan PIVNIČKA a Viktor KANICKÝ
Vydání
Collection of Czechoslovak Chemical Communications, Prague, IOCB, 2000, 0010-0765
Další údaje
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
Příznaky
Recenzováno
Změněno: 29. 6. 2007 10:19, prof. RNDr. Viktor Kanický, DrSc.
V originále
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.
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
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