The Use of Silver Solid Amalgam Electrodes for Voltammetric and Amperometric Determination of Nitrated Polyaromatic Compounds Used as Markers of Incomplete Combustion

Figure 4

(a) Chromatogram of the mixture of 5-NQ (1), 2-NF (2), 1-NP (3), and 3-NFt (4) recorded with HPLC-ED with “wall-jet” m-AgSAE detector for concentration 5 · 10⁻⁶mol L⁻¹ in drinking water after SPE: detection potential −1.5 V. Ox-peak of interfering oxygen. (b) Dependence of peak heights 𝐼_𝑝 on the detection potential 𝐸_det of 5-NQ (1), 2-NF (2), 1-NP (3), and 3-NFt (4). Concentration of each analyte 1 · 10⁻⁴mol L⁻¹. For (a) and (b): mobile phase 0.01 mol L⁻¹ phosphate buffer pH 7.0: methanol (15 : 85; v/v), 𝐹_𝑚=1 mL min⁻¹, 𝑉_inj=20 μL.

(a)

(b)