Proceedings of the International Conference on Educational Sciences and Teacher Profession (ICETeP 2020)
Determination of Gd (III) Concentration by Voltammetry and Its Usage as a Learning Module for Chemistry Student
Santhy Wyantuti, Wina R. Oktaviani, Diana Hendrati, Yeni Wahyuni Hartati, Lena Rahmidar
Santhy Wyantuti
Available Online 1 March 2021.
Rare earth elements, gadolinium, differential pulse voltammetry, learning module
Gadolinium is a rare earth metal that has similar properties as other rare earth metals, making it difficult to separate Gadolinium from the others. Gadolinium has been extracted from Erath’s crust in the form of their minerals, such as monazite and gadolinite. Gadolinium is widely used for applications in various fields, including medicine and chemical industries, and thus its concentration in the environment is important to note. Generally, the concentration of gadolinium is measured by using XRF, ICP-MS, and ICP-AES methods. However, this method has several drawbacks, such as the high cost of equipment and maintenance. Therefore, an efficient alternative method to determine gadolinium concentration is needed, such as voltammetry. The purpose of this study was to determine the concentration of gadolinium utilizing Differential Pulse Voltammetry (DPV) using acetonitrile as an organic solvent. In addition to the voltammetry method, the Box-Behnken experimental design method was used. The use of the Box-Behnken experimental design aims to see the optimal conditions from the current measurement results. The results of optimum conditions were modulation amplitude of 0.10 V, deposition potential of -1.328 V, and deposition time of 64.65 seconds. By using the optimum condition, we achieved the recovery of 91.28%, the accuracy of 84.23%, precision of 94.43%, the detection limit of 3.27 mg/L, and the quantitation limit of 10.91 mg/L. The recommended concentration range of Gd in the sample was from 15.0 to 35.0 mg/L. The result of this research was then applied as a learning module for chemistry students in the undergraduate level at the Department of Chemistry, University of Padjadjaran.
AU  - Santhy Wyantuti
AU  - Wina R. Oktaviani
AU  - Diana Hendrati
AU  - Yeni Wahyuni Hartati
AU  - Lena Rahmidar
TI  - Determination of Gd (III) Concentration by Voltammetry and Its Usage as a Learning Module for Chemistry Student
BT  - Proceedings of the International Conference on Educational Sciences and Teacher Profession (ICETeP 2020)
ID  - Wyantuti2021