Figure 2. Contour plots of (A) absorbance vs FeCl3 concentration and volume, (B) absorbance vs. FeCl3 and MBTH volume, (C) absorbance vs. MBTH and FeCl3 concentration, and (D) absorbance vs. MBTH concentration and volume

From

Design of Experiment Assisted UV-Visible Spectrophotometric and RP-HPLC Method Development for Ambrisentan Estimation in Bulk and Formulations

Shanta K. Adiki, Prashanti M, Baishakhi Dey, Prakash Katakam, Fathi H. Assaleh, Nagiat T. Hwisa, Rajeev K. Singla, Babu R. Chandu

World Journal of Analytical Chemistry. 2014, 2(2), 23-30 doi:10.12691/wjac-2-2-2