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Study of aluminium in groundwater using chemometric methods
Daria Popugaeva1, Konstantin Kreyman1, Ajay K Ray1
1Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Canada.
Environmental Technology
|November 6, 2018
Summary
Chemometric analysis of Khibiny alkaline massif groundwater reveals significant correlations between aluminum (Al) and parameters like pH, nitrate, and chloride. These factors explain over half of the temporal variation in aluminum levels, a health concern for drinking water.
Area of Science:
- Geochemistry
- Environmental Science
- Hydrogeology
Background:
- The Khibiny alkaline massif groundwater aquifer exhibits elevated aluminum (Al) concentrations, posing a potential health risk for household water supply.
- Understanding the spatio-temporal variations and controlling factors of Al is crucial for managing groundwater quality.
Purpose of the Study:
- To investigate the relationships between physico-chemical parameters in Khibiny alkaline massif groundwater using chemometric methods.
- To explore the temporal and frequency domain variations of key parameters, including aluminum (Al).
Main Methods:
- Application of chemometric methods, including Pearson correlation and multiple linear regression.
- Spectral analysis using the Fast Fourier Transform (FFT) algorithm to analyze time series data.
- Calculation of Fourier coefficients, power spectral density (PSD), and cumulative spectral power (CSP).
Main Results:
- Pearson correlation revealed significant relationships between Al concentration and pH, nitrate (NO3-), sulfate (SO42-), chloride (Cl-), and total dissolved solids (TDS).
- A multiple regression model incorporating Cl-, NO3-, and pH explained 54% of the temporal variation in Al concentrations.
- Spectral analysis identified three dominant frequency bands (approx. 5-7, 13-17, and 20-34 months) influencing the temporal variations of Al, Cl-, NO3-, and pH.
Conclusions:
- Physico-chemical parameters, particularly pH, NO3-, and Cl-, are significant drivers of temporal Al variations in the Khibiny groundwater.
- The identified frequency bands provide insights into the cyclical nature of groundwater quality fluctuations.
- These findings are essential for assessing and mitigating health risks associated with Al in drinking water from this aquifer.
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