Page 369 - Multidimensional Chromatography

360 Multidimensional Chromatography

Figure 13.15 Chromatograms obtained by on-line trace enrichment of 50 ml of Ebro river
water with and without the addition of different volumes of 10% Na 2 SO 3 solution for every
100 ml of sample: (a) blank with the addition of 1000 l of sulfite; (b) spiked with 4 g l 1 of
the analytes and 1000 l of sulfite; (c) spiked with 4 g l 1 of the analytes and 500 l of sul-
fite; (d) spiked with 4 g l 1 of the analytes without sulfite. Peak identification is as follows: 1,
oxamyl; 2, methomyl; 3, phenol; 4, 4-nitrophenol; 5, 2,4-dinitrophenol; 6, 2-chlorophenol; 7,
bentazone; 8, simazine; 9, MCPA; 10, atrazine. Reprinted from Journal of Chromatography, A
803, N. Masqué et al., ‘New chemically modified polymeric resin for solid-phase extraction of
pesticides and phenolic compounds from water’, pp. 147–155, copyright 1998, with permis-
sion from Elsevier Science.