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Snapshots Analyses for Turbidity Measurements in Water

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Abstract

Turbidity has been used as an effective indicator of water quality and it is regulated by national control agencies as a water potability parameter. This work proposes a simple, low-cost, and easily reproducible method based on digitally processed snapshots of electromagnetic radiation beam through a scattering medium in order to measure turbidity. The formazin polymer was used as the standard reference in the experiments to prepare samples from 0.1 to 100 NTU for high turbidity range and from 0.02 to 10 FNU for low turbidity range. The device design is comprised of a webcam and an LED/laser as a light sensor and a radiation source, respectively. The captured scattered light snapshot can be decomposed digitally in color components values and correlated with the turbidity parameter. It is possible to obtain differently device performances changing the light sensor device configuration. The linear regression analyses have shown a distinct relationship among red, green, blue, and grayscale components and the turbidity. At high range, the green component present the best LOD and LOQ values 0.64 and 2.10, respectively, operating with an ordinary webcam and white LED. Nevertheless, the best device performances were obtained with dedicated Raspberry Pi camera modules and white LED for low range turbidity reaching LOD=0.027 and LOQ=0.087 FNU. The figures of merit show recovery between (97.50−101.95%), repeatability (2.11%), within-laboratory reproducibility (2.25%), and limits of quantification (0.087 FNU). The achieved performance device shows the effectiveness of digitally processed snapshots obtained with digital cameras for turbidity measurements.

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Acknowledgment

We would like to thank Fundação Araucária for the undergraduate scientific research scholarship. We thank Juciane Wunsch and Matheus H. Lazzarin for their manuscript reading.

Funding

This study is financially supported by FUNASA under Grant 25100.011.260/2014-17.

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Authors and Affiliations

  1. Centro de Ciênicas Exatas–Departamento de Química, Universidade Estadual de Maringá, Av. Colombo, Maringá, PR, 5790, Brazil

    Antonio Cesar Godoy & Oscar Oliveira Santos

  2. Universidade Tecnológica Federal do Paraná, R. Cristo Rei 19 - Vila Becker, Toledo, PR, Brazil

    Alberto Yoshihiro Nakano, David Antônio Brum Siepmann, Ricardo Schneider & Felipe Walter Dafico Pfrimer

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  1. Antonio Cesar Godoy
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  2. Alberto Yoshihiro Nakano
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  3. David Antônio Brum Siepmann
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  4. Ricardo Schneider
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  5. Felipe Walter Dafico Pfrimer
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  6. Oscar Oliveira Santos
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Correspondence to Antonio Cesar Godoy.

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Godoy, A.C., Nakano, A.Y., Siepmann, D.A.B. et al. Snapshots Analyses for Turbidity Measurements in Water. Water Air Soil Pollut 229, 378 (2018). https://doi.org/10.1007/s11270-018-4034-4

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  • DOI: https://doi.org/10.1007/s11270-018-4034-4

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