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Application of near infrared spectroscopy for distinction of drinking water quality based on different treatments

Near infrared spectroscopy (NIRs) is gaining momentum as an analytical tool because of its ability of fast, on-line, non-destructive sample scanning and analysis. According to literature data, it is extensively used in food, chemical, textile and pharmaceutical industry, as well as in biotechnology. The aim of this study was to explore the potential of the use of NIRs for determination of drinking water quality. The analyzed samples were taken from the Butoniga Lake (Istria, Croatia) and have been undergone different treatments: pre-treatment, flocculation and main ozonation. During the pre-treatment phase, the samples were treated with different ozone concentrations (0.2, 1.1 and 2 mg/L), and during the main ozonation phase they were treated with 0.1, 0.3 and 0.5 mg/L ozone for varying duration (5, 15.5 and 30 min). The samples were scanned using the NIR-128L-1.7-USB/6.25/50 µm (Control Development, South Bend, Indiana, USA) spectrophotometer and the data was analyzed by use of principle component analysis in the Statistica v.14 software (Tibco software, Palo Alto, USA). As a result it certainly stands out that, NIR spectroscopy coupled with multivariate data analysis, was able to differentiate the water samples based on the type of treatment with high accuracy (pretreatment, flocculation and main ozonation). Furthermore, when only the main ozonation stage was analyzed, the distinction between the dose of ozone and the duration of ozone treatment was also successful deriving from the recorded NIR spectra. These results confirm the possibility of NIRs usage in water quality analysis, which enables fast on-line analysis with no need of complicated time and resource consuming chemical analyses.

NIR spectroscopy, multivariate analysis, drinking water, ozonation, flocculation

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