Solid phase extraction of cadmium on 2-mercaptobenzothiazole loaded on sulfur powder in the medium of ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate and cold vapor generation-atomic absorption spectrometric determination.
A novel solid phase extractor for preconcentration of cadmium at ng L(-1) levels has been developed. Cadmium ions were retained on a column packed with sulfur powder modified with 2-mercaptobenzothiazole (2-MBT) in the medium of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim](+)PF(6)(-)) ionic liquid. The presence of ionic liquid during modification of sulfur enhanced the retention of cadmium ions on the column. The retained cadmium ions were eluted with 2 mol L(-1) solution of HCl and measured by cold vapor generation-atomic absorption spectrometry (CVG-AAS). By using reaction cell-gas liquid separator (RC-GLS), gaseous cadmium vapors were produced and reached the atomic absorption spectrometer, instantaneously. The influence of different variables on both processes of solid phase extraction and CVG-AAS determination of cadmium ions was investigated. The calibration curve was linear in the range of 10-200 ng L(-1)of cadmium in the initial solution with r=0.9992 (n=8) under optimum conditions. The limit of detection based on three times the standard deviation of the blank (3S(b), n=10) was 4.6 ng L(-1). The relative standard deviation (R.S.D.) of 25 and 150 ng L(-1) of cadmium was 4.1 and 2.2% (n=8), respectively. The procedure was validated by the analysis of a certified reference material (DORM-3), water and fish samples.
Pourreza
N
N
Department of Chemistry, Faculty of Science, Shahid Chamran University, Ahvaz, Iran. npourreza@yahoo.com
Ghanemi
K
K
D000818:Animals; D052160:Benzothiazoles / Q000737:chemistry*; D001894:Borohydrides / Q000737:chemistry; D002104:Cadmium / Q000302:isolation & purification*; D005399:Fishes; D005740:Gases / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry*; D007202:Indicators and Reagents; D018482:Muscle, Skeletal / Q000737:chemistry; D011208:Powders; D052616:Solid Phase Extraction; D012995:Solubility; D013054:Spectrophotometry, Atomic; D013455:Sulfur / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
C412621:1-butyl-3-methylimidazolium hexafluorophosphate; D052160:Benzothiazoles; D001894:Borohydrides; D005740:Gases; D007093:Imidazoles; D007202:Indicators and Reagents; D011208:Powders; D014874:Water Pollutants, Chemical; D002104:Cadmium; C005563:captax; D013455:Sulfur; C025364:sodium borohydride