Evaluation and modeling of the parameters affecting fluoride toxicity level in aquatic environments by bioassay method

Hamid Reza Shamsollahi; Hadi asady; Amir Hossein Mahvi; Zahra zolghadr

doi:10.22110/jkums.v18i1.1518

Journal of Kermanshah University of Medical Sciences

Peer-reviewed Medical Quarterly

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https://doi.org/10.22110/jkums.v18i1.1518

Evaluation and modeling of the parameters affecting fluoride toxicity level in aquatic environments by bioassay method

Author(s):

Hamid Reza Shamsollahi¹,

Hadi asady²,

Amir Hossein Mahvi^1,*,

Zahra zolghadr³

1Dept. of Environmental Health Engineering, Fcaulty of Public Health, Tehran University of Medical Sciences, Tehran, Iran

2Dept. of Occupational Health Engineering, Fcaulty of Public Health, Tehran University of Medical Sciences, Tehran, Iran

3Dept. of Biostatistics, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Journal of Kermanshah University of Medical Sciences:Vol. 18, issue 1; e74272

Published online:Apr 29, 2014

Article type:Research Article

Received:Nov 11, 2013

Accepted:Feb 18, 2014

How to Cite:Shamsollahi HR, asady H, Mahvi AH, zolghadr Z. Evaluation and modeling of the parameters affecting fluoride toxicity level in aquatic environments by bioassay method. J Kermanshah Univ Med Sci. 2014;18(1):e74272. doi: https://doi.org/10.22110/jkums.v18i1.1518

Abstract

Background: Fluoride exists in various forms in nature and water resources. , The rising level of fluoride in water resources due to discharge of industrial effluents can cause toxicity in aquatic organisms. To prevent toxicity, it is necessary to determine maximum fluoride toxicity as well as effluent discharge limits. The aim of this study was to determine the maximum fluoride toxicity and the factors affecting fluoride toxicity to provide a model in order to determine the effluent discharge limits.

Methods: Daphnia magna bioassay in the absence of confounding factors was used to determine the maximum level of fluoride toxicity. Then, bioassay was repeated in the presence of the confounding factors (hardness, temperature and exposure time) to determine their effects.

Results: In the absence of intervening factors, fluoride LC50 levels determined after 24, 48 and 72 hours exposure were 4.9, 46.5 and 38.7 mg/l, respectively.. Also, the influence of confounding factors on LC50 values was reported significant by Minitab software.

Conclusion: Increasing the water hardness reduced fluoride toxicity, and increasing the water temperature and exposure time increased fluoride toxicity in aquatic environments. Therefore, while determining the wastewater discharge limit in terms of fluoride concentration, it is essential to take the effect of confounding factors on fluoride toxicity into account in order to prevent toxicity in the open water resources.

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Author(s):

Hamid Reza Shamsollahi:[PubMed][Scholar]
Hadi asady:[PubMed][Scholar]
Amir Hossein Mahvi:[PubMed][Scholar]
Zahra zolghadr:[PubMed][Scholar]

Peer-reviewed Medical Quarterly

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Evaluation and modeling of the parameters affecting fluoride toxicity level in aquatic environments by bioassay method

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