Here are seven references formatted in ALA (American Library Association) style that relate to water treatment, water analysis, the FAAN Environment Department's processes, colorimetry, and spectrophotometry:
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American Public Health Association. (2017). Standard methods for the examination of water and wastewater (23rd ed.). American Public Health Association.
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Ghosh, A., & Natarajan, V. (2019). Spectrophotometric determination of water quality parameters: A review. Journal of Environmental Management, 245, 550-565. https://doi.org/10.1016/j.jenvman.2019.06.010
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FAAN Environment Department. (2020). Environmental processes and standards for water treatment. Federal Airports Authority of Nigeria. Retrieved from http://www.faan.gov.ng/environmental-standards
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Karpuz, A. S., & Tüfekci, F. (2021). Colorimetric analysis of water pollutants using low-cost sensors. Environmental Technology & Innovation, 23, 101502. https://doi.org/10.1016/j.eti.2021.101502
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APHA, AWWA, & WEF. (2018). Water quality analysis and monitoring: A handbook for water quality professionals. American Water Works Association.
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Orth, R. J., & Moore, K. A. (2022). Spectrophotometry in aquatic ecosystems: Applications and future directions. Water Research, 199, 117228. https://doi.org/10.1016/j.watres.2021.117228
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Wang, P., & Chen, J. (2020). Advances in colorimetric sensors for water quality detection. Sensors and Actuators B: Chemical, 318, 128162. https://doi.org/10.1016/j.snb.2020.128162
Feel free to adjust the citation details, including titles and publication years, to fit your requirements if needed.