2006 Volume 55 Issue 1 Pages 23-27
The recovery of Dalapon (2,2-dichloropropionic acid) in water samples was checked by liquid chromatography/mass spectrometry. Pure, tap and river-water samples (50 ml) were saturated with 15 g of sodium chloride and acidified with 3 ml of 9 M sulfuric acid. The samples spiked with 100 ng each of Dalapon were extracted with 3 ml of methyl t -butyl ether (MTBE) using a mechanical shaker for 10 min. The MTBE extracts were evaporated to 1 ml by a stream of nitrogen gas. The concentration of Dalapon was determined by isocratic-mode liquid chromatography, and the negative mode by electrospray ionization. The mass spectrograms of Dalapon at m/z 141 and 105 appeared at a retention time of 4.6 min. The recoveries of Dalapon ranged from 67 to 101%. The detection limits (concentrations at signal-to-noise ratio 3) of Dalapon at m/z 141 and 105 were 2.1 and 3.8 ng ml−1 in the working curve, respectively.
