Molecularly Imprinted Nanomicrospheres as Matrix Solid-Phase Dispersant Combined with Gas Chromatography for Determination of Four Phosphorothioate Pesticides in Carrot and Yacon

Figure 6

Chromatograms of the standard mixture solution of four pesticides in 25 ng·mL⁻¹ (a), the spiked sample in 2.5 ng·g⁻¹ of four pesticides after preconcentration by N-ethylenediamine propyl silane sorbent (b), the spiked sample in 2.5 ng·g⁻¹ of four pesticides after preconcentration by MIPs sorbent (c), the actual carrot sample (d), and the actual yacon sample (e). Peak identification: 1, tolclofos-methyl; 2, parathion-methyl; 3, chlorpyrifos; 4, phoxim.

(a)

(b)

(c)

(d)

(e)