Fig. 4From: Colorimetric determination of amaranth followed enrichment and separation using buoyant adsorbentsEffect of desorbent (a), desorbent concentration (b), time (c), and temperature (d) on the amaranth desorption. (pH 1, adsorbent dosage 0.24 g, adsorbent time 3 h, adsorbent temperature 20 °C, amaranth 2 mg L−1, adsorption volume 10 mL, oscillation speed 200 rpm, desorption volume 5 mL)Back to article page