Determination of alkylphosphonic acids by microcolumn liquid chromatography with gradient elution coupled on-line with flame photometric detection
2001; Elsevier BV; Volume: 907; Issue: 1-2 Linguagem: Inglês
10.1016/s0021-9673(00)01005-0
ISSN1873-3778
AutoresEdwin W. J. Hooijschuur, Charles E. Kientz, U.A.Th. Brinkman,
Tópico(s)Analytical Chemistry and Sensors
ResumoMicrocolumn liquid chromatography with gradient elution and on-line flame photometric detection has been used for the selective and rapid determination of non-volatile alkylphosphonic acids, which are hydrolysis products of nerve agents, in aqueous samples. A make-up of water was used to maintain stable introduction of the eluent during a gradient run. The detection limits are strongly dependent on quenching, which is determined by the mass flow of methanol in the eluent. Large-volume injections of 100 μl of aqueous solutions of short- and long-chain alkylphosphonic acids resulted in detection limits in the range 6–800 ng/ml. The repeatability of the retention times and analyte response – peak area or peak height – were 0.7–0.9% and 4–11%, respectively. The method was successfully applied to a local tap water sample and an aqueous soil extract.
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