Highlights
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This is the first review of existing calibration methods and criteria to assess their performances.
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Four popular and different methods have been compared on four different data sets.
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Results are supported with the largest data set ever published on UV/Vis spectrophotometer.
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No method performs better than the other one: the easiest method can be then recommended.
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As demonstrated, the main conclusion in independent of locations, weather conditions and pollutants.