Determination of trace levels of dinitrophenolic compounds in environmental water samples using hollow fiber supported liquid membrane extraction and high performance liquid chromatography.
A hollow fiber supported liquid membrane extraction method for the liquid chromatographic determination of dinitrophenolic compounds at ppt levels has been developed. Different variables affecting the extraction process, such as extraction time, shaking speed, acceptor pH, acceptor buffer concentration, salt content and humic acids have been studied. Enrichment factors up to 7000 times were obtained. Validation of the method included calibration experiments and studies of the linearity of the responses in different matrices. Good linearity was obtained in the environmental matrices evaluated. Detection limits range from 6.0 to 8.0 ng/L, and the relative standard deviations do not exceed 7% in terms of repeatability.
Berhanu
Tarekegn
T
Department of Analytical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden.
Liu
Jing-Fu
JF
Romero
Roberto
R
Megersa
Negussie
N
Jönsson
Jan Ake
JA
D005591:Chemical Fractionation / Q000295:instrumentation* / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004140:Dinitrophenols / Q000032:analysis*; D006540:Herbicides / Q000032:analysis; D006812:Humic Substances; D015203:Reproducibility of Results; D014874:Water Pollutants, Chemical / Q000032:analysis*
D004140:Dinitrophenols; D006540:Herbicides; D006812:Humic Substances; D014874:Water Pollutants, Chemical