Detailed Information on Publication Record
2000
Separation and preconcentration of Cr(VI) as ion associate using solid phase extraction
OTRUBA, Vítězslav, Jan PIVNIČKA and Viktor KANICKÝBasic information
Original name
Separation and preconcentration of Cr(VI) as ion associate using solid phase extraction
Authors
OTRUBA, Vítězslav (203 Czech Republic), Jan PIVNIČKA (203 Czech Republic) and Viktor KANICKÝ (203 Czech Republic, guarantor)
Edition
Collection of Czechoslovak Chemical Communications, Prague, IOCB, 2000, 0010-0765
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10406 Analytical chemistry
Country of publisher
Czech Republic
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 0.960
RIV identification code
RIV/00216224:14310/00:00002852
Organization unit
Faculty of Science
UT WoS
000167546600004
Keywords in English
Hexavalent chromium; solid phase extraction; ion associate; flame emission spectrometry
Tags
Reviewed
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.
In Czech
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.
Links
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