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Modeling Microalgal Biosediment Formation Based on Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR)

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This study shows that nitrate levels, not carbon dioxide, significantly impact marine microalgae physiology and growth rates. The developed spectroscopic and chemometric methods help understand pollutant effects on these vital aquatic organisms.

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ATR FT-IRAttenuated total reflection Fourier transform infrared spectroscopyenvironmental monitoringmicroalgaenonlinear chemometrics

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Area of Science:

  • Marine biology
  • Environmental science
  • Analytical chemistry

Background:

  • Anthropogenic pollutants impact ecosystems, necessitating understanding of their interactions with organisms.
  • Microalgae are crucial in marine environments, sequestering pollutants and playing a role in carbon dioxide (CO2) and nitrate cycling.
  • Harmful algal blooms are often linked to excess nitrate, while CO2 is a major greenhouse gas.

Purpose of the Study:

  • To investigate the impact of varying atmospheric CO2 and dissolved nitrate concentrations on the physiological properties of marine microalgae (Nannochloropsis oculata).
  • To develop and apply novel chemometric hard-modeling methodologies for interpreting microalgal adaptations to environmental changes.
  • To assess the link between chemical conditions and phytoplankton physiological responses using spectroscopic techniques.

Main Methods:

  • Utilized attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy to monitor microalgal biomass settling rates.
  • Employed multivariate curve resolution-alternating least squares (MCR-ALS) algorithm to extract spectroscopic and time profiles from time-series data.
  • Cultured Nannochloropsis oculata under 25 different chemical scenarios varying CO2 (200-600 ppm) and nitrate (0.35-0.75 mM) levels.

Main Results:

  • Analysis revealed that only nitrate concentrations, within the tested ranges, significantly affected the physiological properties of the microalgae.
  • The growth rate of the microalgal cultures was demonstrably influenced by the ambient nitrate levels.
  • CO2 concentrations did not show a significant impact on the measured physiological parameters.

Conclusions:

  • The developed spectroscopic and chemometric approach provides a robust method for studying the effects of environmental chemistry on phytoplankton.
  • Nitrate is identified as a key factor influencing microalgal physiology and growth in the studied conditions.
  • This methodology can aid in understanding the broader ecological consequences of anthropogenic pollutants in marine ecosystems.