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Please use this identifier to cite or link to this item: https://repository.uksw.edu/handle/123456789/20683
Title: Determination of pH Solution Using Near-Infrared Spectroscopy
Authors: Rahayu, Ria
Keywords: NIRS;PLSR;pH
Issue Date: 2020
Publisher: Program Studi Fisika FSM-UKSW
Abstract: About 60% of the main element of the human body is water. Water, has a very important role for the body, including to maintain physiological functions such as blood pressure and pH. The level pH of the human body determines the regulation of the concentration of hydrogen ions in the body. The concentration of hydrogen ions greatly affects the metabolic processes that take place in the body because almost all enzyme activity is influenced by the concentration of hydrogen ions. To measure the pH, a pH meters or litmus paper is needed, but the device has a limitation that cannot be used for microscopic objects such as cells. This study aims to build a pH determination model using near infrared spectroscopy. The model was made using a buffer solution of acetic acid and sodium acetate with different pHs. The sample was measured using NIRS, then the absorbance spectrum analyzed was at the source of 6000-8000 cm-1. The analytical method used is partial least squares regression and leave one out technique for validation. In this analysis, the predicted pH is approaching the real pH with an error of 0.036. The best prediction value for the number of residual errors of validation is in the number of latent variables 2 that is 0.047, and then the value of R2=0.93, standard deviation of 0.216. Based on the results obtained, this method can be an alternative to determine the pH of a solution.
Description: Tidak diizinkan karya tersebut diunggah ke dalam aplikasi Repositori Perpustakaan Universitas karena telah dipublikasi ke Positron Berkala Ilmiah Fisika, Universitas Tanjungpura dengan alamat akses http://jurnal.untan.ac.id/index.php/jpositron.
URI: https://repository.uksw.edu/handle/123456789/20683
ISSN: 2020120289
Appears in Collections:T1 - Physics

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