J. Sirajudeen, and J. Naveen. “Effect of PH and Adsorbent Dosage on the Removal of Hexavalent Chromium from Its Aqueous Solution by Activated Carbon of Pachygone Ovata”. World Journal of Pharmaceutical Sciences, vol. 3, no. 10, Oct. 2015, pp. 1987-90, https://wjpsonline.com/index.php/wjps/article/view/hexavalent-chromium-activated-carbon-pachygone-ovata.