Determination of herbicides by reductive amperometric detection in liquid chromatography Journal of Chromatography A, Volume 763, Issues 1-2, 28 February 1997, Pages 227-235 N. Ruiz de Erenchun, M. A. Goicolea, Z. Gomez de Balugera, M. J. Portela, R. J. Barrio
Abstract A liquid chromatographic method has been developed for the determination of the herbicides metamitron, metribuzin, isometiozin and nitralin in soil samples. Reductive amperometric detection using a hanging mercury drop electrode has been selected because of the selectivity of the technique. The separation has been performed in a Spherisorb CN, 5 μm (250×4.0 mm) column. A mobile phase consisting of acetonitrile-phosphate buffer (32:68, v/v) pH 2.5 was used the detector operated in direct current mode at E = −1350 mV. The analysis time was 9 min. The mean relative standard deviations (R.S.D.) of the results were <4%. Conditions for extraction of herbicides from soil samples have been established. The method allows the determination of 3.4, 2.9, 12.1 and 6.9 ng g−1 of metamitron, metribuzin, isometiozin and nitralin in soil, respectively.
Direct determination of metamitron in surface water by large sample by volume injection Journal of Chromatography A, Volume 543, 1991, Pages 244-249 René B. Geerdink
Abstract For a number of applications, e.g., monitoring os surface water quality, trace components which can be detected at levels of 0.1–1 ng do not need preconcentration. However, the determination of these components is usually performed after liquid—liquid or solid-phase extraction, which is time consuming. Injection of the sample directly into the separation system not only saves time (allowing higher sample throughputs), but is also uncomplicated and thus automatable. Metamitron was determined by direct injection of (surface) waer samples onto an analytical C18 column. With a 2-ml loop injection, the detection limit was 0.15 μg/l in surface water. No significant peak broadening compared with a 20-μl loop injection was observed. The linearity of the method was satisfactory (r2 = 0.9985) and the relative standard deviation for seven replicate 2-ml injections at 2 μg/l was 3%. The total analysis time was only 10 min.
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