Development of a low-cost colorimeter and its application for determination of environmental pollutants

Hoang, Le Quoc; Chi, Huynh Bui Linh; Khanh, Dang Nguyen Nha; Vy, Ngo Thi Tuong; Hanh, Phan Xuan; Vu, Truong Nguyen Luan; Lam, Hoang Thuc; Phượng, Nguyễn Thị Kim

doi:10.1016/j.saa.2020.119212

Cited by 11 publications

(9 citation statements)

References 24 publications

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“…Some similar studies reported the costs of their systems, while others chose not to disclose such information. For instance, Hoang et al (2021) claimed that their system cost less than USD50.00 [35], while Khoshmaram and Mohammadi (2021) did not provide such information [36]. Therefore, for comparison, the cost of the system in this study is much lesser than that of the system demonstrated in [35].…”

Section: Development Of Fitting Modelsmentioning

confidence: 59%

“…Even though Chicco et al [33] argues that R 2 = 0.80 indicates a "very good" fitting model, however, at least two recent studies in low-cost optical environmental sensors reported their fitting models as having R 2 values greater than 0.99 [35,36]. Therefore, more experimental works are necessary to improve the fitting model.…”

Section: Development Of Fitting Modelsmentioning

confidence: 99%

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The Application of Endoscope and Image Processing for Determining Remazol Red Dye Concentration in Water Samples

Nazibudin

Zainuddin²,

Nazruddin³

et al. 2022

Jurnal Teknologi

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Remazol dyes are widely used in textile industry, which are then discharged to the environment as waste products. Studies on bioremediation and decolorization of dye waste normally employ expensive spectrometers or colorimeters. This study proposes a low-cost procedure to determine the concentration of Remazol red dye with the use of a digital endoscope and image processing technique. The concentration of Remazol red dye considered in this study ranges from 0.001 to 0.700 g/L. An endoscope is used to capture digital images of dye samples. Reg-green-blue (RGB) images of the samples are converted to grayscale images, which are then converted to a mean grayscale index (MGI). The MGI is then calibrated with real concentration of dye samples. Three calibration curves were developed for three different ranges of dye concentration of 0.001- 0.010 g/L, 0.020 – 0.100 g/L, and 0.100 – 0.700 g/L, with a coefficient of determination (R2) of 0.961, 0.9793, and 0.9903, respectively.

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Section: Development Of Fitting Modelsmentioning

confidence: 59%

Section: Development Of Fitting Modelsmentioning

confidence: 99%

The Application of Endoscope and Image Processing for Determining Remazol Red Dye Concentration in Water Samples

Nazibudin

Zainuddin²,

Nazruddin³

et al. 2022

Jurnal Teknologi

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show abstract

“…Therefore, a growing trend towards the use of portable analysis systems can be observed. Portable photometers have already been developed for utilization in different areas of application, for example health [ 1 , 2 , 3 , 4 , 5 ], food quality control [ 6 , 7 , 8 , 9 , 10 , 11 ], environmental monitoring [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ] and citizen science and education [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…There are already some portable photometers and fluorimeters available. They can be smartphone-based [ 42 ] or controlled by a microcontroller [ 11 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 40 , 43 , 44 , 45 , 46 , 47 ]. Nearly all of them are to be used either as a photometer or as a fluorimeter.…”

Section: Introductionmentioning

confidence: 99%

Portuino—A Novel Portable Low-Cost Arduino-Based Photo- and Fluorimeter

Nonno

Ulber

2022

Sensors

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A novel portable low-cost Arduino-controlled photo- and fluorimeter for on-site measurements has been developed. The device uses LEDs as a light source and a phototransistor as a light sensor. The circuit is based on the discharge of a capacitor with the photocurrent from the phototransistor. Validation experiments for absorbance measurements were performed by measuring protein concentration using the Bradford method and measuring phosphate ions in water using a commercial test kit. The emission light of the excited fluorescent dyes rhodamine 6G and calcofluor white was measured to validate the usability of the device as a fluorescence photometer. In all validation experiments, similar correlation coefficients and limit of detection could be achieved with the portable photo- and fluorimeter and a laboratory spectrometer and fluorimeter. Real sample analysis was performed, measuring phosphate concentration in freshwater and concentration of green fluorescent protein, extracted from Escherichia coli.

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“…The implementation of a monochromatic optical system has been reported in many light-emitting-diode (LED) based systems developed for various applications [20]- [23]. However, the system must be application driven and specific in terms of colour and parameter to be detected [24], [25]. To address this issue, one of its challenges is to identify which colour has the best performance in terms of detection signal as it contributes to the sensitivity of the performance.…”

Section: Introductionmentioning

confidence: 99%

Optical absorbance of RGB LEDs in pH measurement of colorimetric solution with phenol red reagent

Dali

Azam

Rahman

et al. 2022

IJEECS

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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.

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Development of a low-cost colorimeter and its application for determination of environmental pollutants

Cited by 11 publications

References 24 publications

The Application of Endoscope and Image Processing for Determining Remazol Red Dye Concentration in Water Samples

The Application of Endoscope and Image Processing for Determining Remazol Red Dye Concentration in Water Samples

Portuino—A Novel Portable Low-Cost Arduino-Based Photo- and Fluorimeter

Optical absorbance of RGB LEDs in pH measurement of colorimetric solution with phenol red reagent

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