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All Journal Journal of Aceh Physics Society Indonesian Journal of Chemistry Indonesian Journal of Electrical Engineering and Computer Science
Ahmad Fairuz Omar
School Of Physical Sciences, Universiti Sains Malaysia, Minden, Penang 11800, Malaysia
Chemical Engineering, Chemistry & Bioengineering Chemistry Physics

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Immobilization of Sulfur from Different Precursors on Mini Rice-Husk-Ash Pellet Coated Chitosan Film and the Application for Mercury Vapor Uptake Muhammad Adlim; Fitri Zarlaida; Ibnu Khaldun; Rizka Dewi; Sofyatuddin Karina; Ahmad Fairuz Omar
Indonesian Journal of Chemistry Vol 19, No 2 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (297.499 KB) | DOI: 10.22146/ijc.34552

Abstract

Stabilizing elemental mercury using elemental sulfur has been a laboratory standard method but the studies in gas system are still growing. This study aims to explore the effect of different type immobilized sulfurs toward the mercury vapor uptake in a mini gas reactor. Sulfur powder, sulfur dissolved in carbon disulfide and colloidal sulfur from sodium thiosulfate-hydrochloric acid were immobilized on mini rice-husk-ash pellets that were previously coated with chitosan film. The average thinness of chitosan film was 58 µm covered the each pellet surface with dimension of 3 mm Ø x 4 mm. The trends of the mercury uptake and the rate of absorption were described as follow; Pellet-Scolloid > Pellet-SCS2 > Pellet-Spowder. The mean percentages of mercury uptake after 1 h running at 70oC were 99.36; 89.09 and 75.00 respectively. The reverse trends were observed for the size of S-particle aggregation and the amount of S found on the pellet surface.  
Development of an optical pH measurement system based on colorimetric effect Puteri Nur Syahirah Mohamed Mustafa; Aiman Shahmi Azam; Mohd Suhaimi Sulaiman; Ahmad Fairuz Omar; Mohamad Faizal Abd Rahman
Indonesian Journal of Electrical Engineering and Computer Science Vol 24, No 2: November 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v24.i2.pp728-735

Abstract

This paper proposed an optical pH measurement system developed to measure the changes of pH levels based on colorimetric reactions with phenol red reagent. The optical sensing was achieved through the implementation of a pair of light emitting diode (LED) and photodiode. The detection mechanism was based on different absorbance of light intensity at pH values of 2.36, 8.32, 9.08 and 12.83. The data processing method was carried out using LabVIEW software and interfaced with NI USB DAQ 6008. The measured voltage showed a good correlation in relation to the pH level with R2 equals to 0.9624. This relationship was used as a calibration curve in the final system testing. The final measurement of pH showed a good agreement between the actual and measured values with an error of less than 5%, thus indicating the reliability of the proposed system.
Optical absorbance of RGB LEDs in pH measurement of colorimetric solution with phenol red reagent Mohd Rumaizan Maidan Dali; Aiman Shahmi Azam; Mohamad Faizal Abd Rahman; Khairul Azman Ahmad; Nor Azlan Othman; Mohd Hanapiah Abdullah; Ahmad Fairuz Omar
Indonesian Journal of Electrical Engineering and Computer Science Vol 27, No 3: September 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v27.i3.pp1330-1337

Abstract

The use of red, green, and blue ( RGB ) light-emitting-diode ( LED ) is a new trend in monochromatic colorimetric sensing due to cost-effective implementation. However, the application of RGB LED in pH measurement depends on the performance of the LED colour towards the colorimetric solution of interest, hence, needs to be evaluated. This work evaluated the performance of RGB LED for pH measurement system based on colorimetric approach using phenol red as a reagent. The main objective was to identify the LED colour with the best performance in terms of signal response and a bsorbance behavior. In this work, LED and photodiode were used as optical components and NI USB DAQ with LabView as the processing software. Four samples with known pH values were prepared and tested to obtain the voltage and absorbance behavior of each LED colour. Among all, the blue LED with wavelength ranged between 450 - 495 nm showed the best sensing behavior based on its linearity and error. Both voltage response and absorbance produced linear correlation with R 2=0.883 and R 2=0.9803, respectively. The significant finding from this study is useful in selecting the best RGB LED that is suitable for colorimetric pH measurement with phenol red as its colorimetric reagent.
Realtime instrumentation system towards blood oxygen saturation level monitoring with Liquid Crystal Display (LCD) and smartphone Zakaria Husen; Zaid Albarra; Khairi Suhud; Fauzi Fauzi; Elin Yusibani; Irhamni Irhamni; Fadhli Syamsuddin; Edwar Iswardy; Nurhanif Nurhanif; Ahmad Fairuz Bin Omar; Muhammad Syukri Surbakti
Journal of Aceh Physics Society Volume 12, Number 2, April 2023
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v12i2.31131

Abstract

Abstrak. Oksigen memainkan peranan vital dalam tubuh untuk mengatur sistem peredaran darah. Namun jika kadar saturasi oksigen dalam darah (SpO2) berkurang atau tidak mencukupi maka dapat menyebabkan sesak nafas, bahkan dapat mempengaruhi fungsi kerja otak. Perangkat oksimeter digunakan untuk mengukur kadar saturasi oksigen dalam darah dengan pengukuran secara non-invasif, sehingga kekurangan oksigen dalam darah dapat dideteksi lebih awal. Oksimeter yang tersedia saat ini umumnya menampilkan hasil SpO2 tidak terhubung ke jaringan sehingga tidak dapat dipantau secara jarak jauh. Oleh karena itu diperlukan suatu perangkat yang dilengkapi dengan fitur monitoring dalam jaringan agar dapat memantau kondisi partisipan secara real-time. Penelitian ini bertujuan untuk mengembangkan sistem monitoring pengukuran saturasi oksigen dalam darah yang dapat diakses secara remote menggunakan smartphone. Alat rancangan ini menggunakan sensor MAX30100 dan NodeMCU ESP8266 sebagai mikrokontroler. Hasil pengukuran alat rancangan dapat dipantau secara real-time melalui website menggunakan aplikasi Blynk. Data pembanding yang digunakan adalah alat Oksimeter komersial. Pengujian telah dilakukan pada partisipan laki-laki berusia 14 dan 22 tahun, dan perempuan berusia 18 dan 45 tahun. Hasil pengujian secara keseluruhan menunjukkan bahwa alat yang dirancang relative sama dengan oksimeter komersial, yang ditunjukkan oleh nilai thitung ttabel. Abstract. Oxygen plays a vital role in regulating our blood circulation system. However, if the oxygen levels in the blood decrease or are insufficient, it can cause shortness of breath and even affect brain function. To address this problem, an oximeter provides an effective solution by providing a device that can measure blood oxygen saturation without having to place any device inside the body. Currently available oximeter devices usually only display the SpO2 results on the device itself. Therefore, a device with a remote monitoring feature is needed to monitor participants’ condition in real-time. This research aims to develop a remote-access blood oxygen saturation measurement monitoring system using the MAX30100 sensor and the NodeMCU ESP8266 as the microcontroller, the values can be viewed in real-time on website by the Blynk app. The comparison data used is a comercial oximeter device. The participants were the males aged 14 and 22 years, and the female aged 18 and 45 years. Herein, we found that the designed instrument shows excellent performance in which ttest ttable from overall data.
Co-Authors Adlim Aiman Shahmi Azam Edwar Iswardy Elin Yusibani Fadhli Syamsuddin Fauzi Fauzi Fitri Zarlaida Ibnu Khaldun Irhamni Irhamni KHAIRI SUHUD Khairul Azman Ahmad Mohamad Faizal Abd Rahman Mohamad Faizal Abd Rahman Mohd Hanapiah Abdullah Mohd Rumaizan Maidan Dali Mohd Suhaimi Sulaiman Muhammad Syukri Surbakti Nor Azlan Othman Nurhanif Nurhanif Puteri Nur Syahirah Mohamed Mustafa Rizka Dewi Sofyatuddin Karina Zaid Albarra Zakaria Husen