Carbonized Aramid Fiber as the Adsorbent for In-Tube Solid-Phase Microextraction to Detect Estrogens in Water Samples

Figure 3

The chemical structure of PPTA (a); SEM micrographs of aramid fiber before (b, c, and d) and after being carbonized (e, f, and g).

(a)

(b)

(c)

(d)

(e)

(f)

(g)