1Department of Chemistry, Faculty of Mathematic and Natural Sciences, University of Lampung, Indonesia
2Department of Agricultural Economic Social, Faculty of Agriculture, University of Lampung, Indonesia
*Corresponding Author E-mail: suharso_s@yahoo.com, suharso@unila.ac.id
Online published on 13 March, 2013.
The role of Gambier extracts (Uncaria Gambier Roxb leaves) as inhibitor of calcium sulfate scale formation has been studied using bottle roller batch and seeded experiment method at the CaSO4 growth solution concentration of 0.1–0.3 M and at the experiment temperature of 80°C. The effectiveness of inhibitor in inhibiting of the formation of calcium sulfate scale depends on the concentration of Gambier extracts added into the growth solution and the concentration of growth solution. Generally, the presence of 50–250 ppm of the Gambier extracts into the growth solution of CaSO4 from 0.1 to 0.3 M is effective to inhibit 6–63% the calcium sulfate scale formation. In addition, the highest effectiveness occurs in the presence of 250 ppm inhibitor at the CaSO4 growth solution concentration of 0.1 M with the inhibitor effectiveness of 63.17%.
Inhibitor, Gambier extract, Calcium sulfate, scaling
