A Real-Time Water Quality Measurement Instrument for Simultaneously Detecting Turbidity and Particle Size by Using Single-Photon Counting Technique

Wang, Peng; Wang, Xiujuan; Yu, Fajun; Gui, Huaqiao; Kong, Deyi; Khan, Palwasha; Wang, Huanqin

doi:10.1109/tim.2022.3180421

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Nephelometers use light scattering to measure water quality, while turbidimeters use light absorption . Both devices are widely used and present similar limitations. ,− First, these methods measure relative light intensity to extract turbidity readings, and thus cannot distinguish between contaminants. , Second, nephelometers and turbidimeters perform poorly when measuring very small particles that scatter less light, especially when present in low concentrations. , Finally, different nephelometers and turbidimeters may have different optical systems that can affect the accuracy of the measurements, and the use of formazin as a normalization standard can be problematic because it can become less stable as the concentration of contaminants decreases. ,, To overcome these challenges, we suggest a new method that relies on the optical properties of the contaminants to verify their concentration. Since the contaminants scatter and absorb light, we suggest using the full scattering profile (FSP) and utilizing the appearance of the iso-pathlength (IPL) point to accurately measure contaminant concentration.…”

Section: Introductionmentioning

confidence: 99%

“… 4 Both devices are widely used and present similar limitations. 3 , 5 − 7 First, these methods measure relative light intensity to extract turbidity readings, and thus cannot distinguish between contaminants. 2 , 3 Second, nephelometers and turbidimeters perform poorly when measuring very small particles that scatter less light, especially when present in low concentrations.…”

Section: Introductionmentioning

confidence: 99%

“…2 , 3 Second, nephelometers and turbidimeters perform poorly when measuring very small particles that scatter less light, especially when present in low concentrations. 5 , 8 Finally, different nephelometers and turbidimeters may have different optical systems that can affect the accuracy of the measurements, and the use of formazin as a normalization standard can be problematic because it can become less stable as the concentration of contaminants decreases. 3 , 9 , 10 To overcome these challenges, we suggest a new method that relies on the optical properties of the contaminants to verify their concentration.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Detecting Contaminants in Water Based on Full Scattering Profiles within the Single Scattering Regime

Tzroya,

Erblich,

Duadi

et al. 2023

ACS Omega

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Clean water is essential for maintaining human health. To ensure clean water, it is important to use sensitive detection methods that can identify contaminants in real time. Most techniques do not rely on optical properties and require calibrating the system for each level of contamination. Therefore, we suggest a new technique to measure water contamination using the full scattering profile, which is the angular intensity distribution. From this, we extracted the iso-pathlength (IPL) point which minimizes the effects of scattering. The IPL point is an angle where the intensity values remain constant for different scattering coefficients while the absorption coefficient is set. The absorption coefficient does not affect the IPL point but only attenuates its intensity. In this paper, we show the appearance of the IPL in single scattering regimes for small concentrations of Intralipid. We extracted a unique point for each sample diameter wherein light intensity remained constant. The results describe a linear dependency between the angular position of the IPL point and the sample diameter. In addition, we show that the IPL point separates the absorption from the scattering, which allows the absorption coefficient to be extracted. Eventually, we present how we used the IPL point to detect the contamination levels of Intralipid and India ink in concentrations of 30–46 and 0–4 ppm, respectively. These findings suggest that the IPL point is an intrinsic parameter of a system that can be used as an absolute calibration point. This method provides a new and efficient way of measuring and differentiating between various types of contaminants in water.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Detecting Contaminants in Water Based on Full Scattering Profiles within the Single Scattering Regime

Tzroya,

Erblich,

Duadi

et al. 2023

ACS Omega

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A Smart, Multi-configuration, and Low-cost System for Water Turbidity Monitoring

Vecchio,

Bini,

Lazzarotti

et al. 2024

Results in Engineering

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Toward Continuous Nano-Plastic Monitoring in Water by High Frequency Impedance Measurement With Nano-Electrode Arrays

2023

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We explore the potentiality of high frequency impedance measurements with CMOS nano-electrode arrays for nano-plastic pollutant particles monitoring in water. This technology offers benefits as nano-scale resolution, high parallelization, scalability, label-free single particle detection, and automatic measurements without operator intervention. Simple models are proposed for size and concentration estimation. The former integrates measurements of adjacent electrodes and shows uncertainty comparable to the nominal one with mean prediction error lower than 45 % down to 50 nm radius. The latter accounts for noise in the definition of the sensing volume. We report a worst-case concentration error lower than a factor 1.7 under stationary and continuous flow, which demonstrates the potential of this technology for automated measurements.

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A Real-Time Water Quality Measurement Instrument for Simultaneously Detecting Turbidity and Particle Size by Using Single-Photon Counting Technique

Cited by 5 publications

References 22 publications

Detecting Contaminants in Water Based on Full Scattering Profiles within the Single Scattering Regime

Detecting Contaminants in Water Based on Full Scattering Profiles within the Single Scattering Regime

A Smart, Multi-configuration, and Low-cost System for Water Turbidity Monitoring

Toward Continuous Nano-Plastic Monitoring in Water by High Frequency Impedance Measurement With Nano-Electrode Arrays

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