Monitoring Natural Organic Matter in Surface Water by UV Spectroscopy: Effects of Calcium, Magnesium and pH Value

A.L. Rodrigues, R. Nogueira, P. Janknecht, and A.G. Brito (Portugal)


Natural organic matter, fresh water; pH; magnesium,calcium, spectrophotometry


The aim of this study was to evaluate the effects of dissolved magnesium and calcium ions on the determination of humic substances in water by spectrophotometry at 254 nm. Quantifications were carried out for different pH values, both with and without filtration of the samples. The smallest effects were observed for unfiltered samples and neutral pH values.

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