PENGEMBANGAN DAN VERIFIKASI METODE KANDUNGAN EU, ND, DAN PR DARI SAMPEL GEOLOGI DENGAN INDUCTIVELY COUPLED PLASMA-OPTICAL EMISSION SPECTROSCOPY (ICP-OES)

• Main Author: Ridha Rahma, Amalia
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/70573
• Institution: Institut Teknologi Bandung

Indonesia is a country with rich natural resources. One of these natural resources is Rare Earth Elements (REE). REE usually contained within rocks in a relatively low quantity. Therefore, it is essential to have a verified method that can accurately determine its content. One of the analytical methods that are appropriate for this subject matter is ICP-OES (Inductively Couple Plasma-Optical Emission Spectroscopy). From this research, a method was developed to measure the contents of Eu, Pr, and Nd retrieved from geological samples. The four acid dissolution method (HNO3, HF, HClO4, and H2SO4) was implemented in this research. After the method is determined, the method is verified by measuring 5 parameters namely; linearity parameter, accuracy parameter, precision parameter, Limit of Detection (LoD), and Limit of Quantification (LoQ). Measurements were made on two geological samples, 2151-2153 and 2174-2175 samples. Measurement of Eu measured at wavelength 381.967 nm gives a regression of 0.9989 with LoD and LoQ 0.314 ppm and 0.406 ppm, as well as accuracy and RSD of sample 2151-2153 and 2174-2175 respectively 80.6% and 93.56% with RSD values 1.56% and 0.46%. Measurement of Eu at wavelength 397.197 nm gives a regression of 0.9991 with LoD and LoQ 0.121 ppm and 0.306 ppm, as well as accuracy and RSD of sample 2151-2153 and 2174-2175 respectively 81.13% and 95.85% with RSD value of 2.06% and 2.33%. Pr measurement at wavelength of 417.939 nm gives a regression of 0.9998 with LoD and LoQ 0.113 ppm and 0.187 ppm, as well as accuracy and RSD of sample 2151-2153 and 2174-2175 respectively 96.77% and 101.07% with RSD value of 1.21% and 1.15%. Pr measurement at wavelength of 422.532 nm gives a regression of 0.9992 with LoD and LoQ 0.121 ppm and 0.338 ppm, as well as accuracy and RSD of sample 2151-2153 and 2174-2175 respectively 97.03% and 99.32% with RSD value of 0.89% and 1.27%. Measurement of Nd at wavelength of 406.108 nm gives a regression of 0.9993 with LoD and LoQ 0.106 ppm and 0.323 ppm, as well as accuracy and RSD of sample 2151-2153 and 2174-2175 respectively 96.04% and 97.64% with RSD value of 0.88% and 1.43%. Measurement of Nd at wavelength of 410.945 nm gives a regression of 0.998 with LoD and LoQ 0.173 and 0.526, as well as accuracy and RSD of sample 2151-2153 and 2174-2175 respectively 97.1% and 99.01% with RSD value 1.22 % and 1.11%. In the linearity parameter with R2 > 0.995, all elements meet these parameters, while in the accuracy parameter with an accuracy limit range of 90-107%, only Eu in sample measurements 2151-2153 with wavelength of 381.197 nm does not meet these parameters. In the precision parameter with the acceptance range of % RSD < 2/3 Horwitz CV, then all elements meet these criteria except Eu. The method has been verified to be well used for Pr and Nd elements but for Eu elements it still doesn't give good enough results which can be caused by matrix disturbances. Based on CRM, the good wavelengths used for Eu, Pr, and Nd measurements are 397.197 nm, 417.939 nm, and 410.945 nm respectively