Modification of Volume Silica Analysis Method in Water Samples to Reduce Hazardous Wastewater at Badak LNG Laboratory
Volume of hazardous wastewater generated from analysis of the Badak LNG laboratory activities was found around 1.93 tons with an average of 161 kg/month in 2018 where 27% of this total wastewater came from silica analysis activities. Hence, many efforts have been done to reduce the amount of hazardous wastewater. In this research, the silica analysis activities have been carried out using American Journal of Public Health (APHA) 4500-D Heteropoly Blue method by modification of the volume from the silica content of water samples and reagents at 75%, 50%, and 25% (or ¾, ½, and ¼) recipes. Moreover, in the testing and validation phase, the measurement of silica levels in all samples has been performed using UV-Vis spectrometer at a wavelength of 815 nm. These modifications have included parameters of linearity, precision, accuracy, limit of detection (LoD), and limit of quantitation (LoQ). It was found that the volume modification for all samples have fulfilled the required parameters from association of official analytical chemists (AOAC) in linearity, accuracy, and precision. For instance, sample with ½ recipes showed coefficient of determination (R2) of 0.9997%, an accuracy of 103.80, and precision (%RSD) value of 0.524. Indeed, LoD and LoQ values for this sample were found to be 0.004 and 0.008. Modification to the volume of ½ recipe was particularly chosen because it was produced the minimum amount of liquid waste remaining at 8.25 mL with the test Duplo analysis. These results demonstrated that silica analysis activities can be used for reduction of wastewater.
Badak LNG, Annual Report Tahun 2019, http://portal.badaklng.co.id/images/pdf/Annual-Report-Badak-LNG-2019.pdf.
L. D. Sakti, and I. D. Prasetwayan, Makalah CIP “Mengurangi Jumlah Limbah Bahan Berbahaya dan Beracun (B3) Laboratorium dengan memodifikasi volume Analisa Silika Pada Sampel Air di Badak LNG”. IProve Silow., Bontang, 2019.
APHA, Standard Methods For the Examination of Water and Wastewater, 23rd edition, 2017.
M. C. Schwartz, Colorimetric Determination of Silica in Boiler Water, Ind. Eng. Chem. Anal. Ed., 1934, 6, 364–367, DOI: https://dx.doi.org/10.1021/ac50091a027
J. Płotka-Wasylka, A new tool for the evaluation of the analytical procedure: Green Analytical Procedure Index, Talanta, 2018, 204–209, DOI: https://dx.doi.org/10.1016/j.talanta.2018.01.013.
ISO/IEC 17025:2017, “General Requirements for The Competence of Testing and Calibration Laboratories”.
Harmita, Petunjuk Pelaksanaan Validasi Metode dan Cara Perhitungannya, Majalah Ilmu Kefarmasian, 2004, 1(3), 117–135.
AOAC, Official Methods of Analysis of The Association of Official Analytical Chemist. AOAC Inc., Washington, 2016.
J. Ermer, dan J. H. McB, Miller, Method Validation in Pharmaceutical Analysis, A Giude to Best Practice, Weinheim: Wiley-VchVerlag GmbH dan Co. KgaA., 2005.
B. T. Alquadei, Development and Validation of a New HPLC Analytical Method for the Determination of Diclofenac in Tablets, Saudi Pharma. J., 2019, 66–67, DOI: https://dx.doi.org/10.1016/j.jsps.2018.07.020.
International Conference on Harmonization (ICH), Validation of Analytical Procedures: Text and Methodology Q2(R1), http://www.ich.org, 2005.
Copyright (c) 2020 Lalang Dwiyoga Sakti, Ika Dalu Prasetyawan, Achmad Dian Nugraha
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
The manuscript will be made open access under the term of the Creative-Commons Attribution-NonCommercial-NoDerivatives License which permits use, distribution and reproduction in any medium, provided that the contribution is properly cited, the use is non-commercial and no modifications or adaptations are made.